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Kim YR, Baek JI, Lee KY, Kim UK. Berberine chloride protects cochlear hair cells from aminoglycoside-induced ototoxicity by reducing the accumulation of mitochondrial reactive oxygen species. Free Radic Biol Med 2023; 204:177-183. [PMID: 37119862 DOI: 10.1016/j.freeradbiomed.2023.04.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 04/22/2023] [Accepted: 04/26/2023] [Indexed: 05/01/2023]
Abstract
Aminoglycoside, a medicinal category of antibiotics, are used in treatment of Gram-negative bacterial infections. Although they are the most widely-used antibiotics due to their high efficacy and low cost, several main adverse effects have been reported including nephrotoxicity and ototoxicity. Since drug-induced ototoxicity is one of the major etiological causes of acquired hearing loss, we examined cochlear hair cell damages caused by three aminoglycosides (amikacin, kanamycin, and gentamicin), and investigated protective property of an isoquinoline-type alkaloid, Berberine chloride (BC). Berberine, a well-known bioactive compound found from medicinal plants, has been known to have anti-inflammatory, antimicrobial effects. To determine protective effect of BC in aminoglycoside-induced ototoxicity, hair cell damages in aminoglycoside- and/or BC-treated hair cells using ex vivo organotypic culture system of mouse cochlea. Mitochondrial ROS levels and depolarization of mitochondrial membrane potential were analyzed, and TUNEL assay and immunostaining of cleaved caspase-3 were performed to detect apoptosis signals. As the results, it was found that BC significantly prevented aminoglycoside-induced hair cell loss and stereocilia degeneration by inhibiting excessive accumulation of mitochondrial ROS and subsequent loss of mitochondrial membrane potential. It eventually inhibited DNA fragmentation and caspase-3 activation, which were significant for all three aminoglycosides. This study is the first report suggested the preventative effect of BC against aminoglycoside-induced ototoxicity. Our data also suggests a possibility that BC has the potential to exert a protective effect against ototoxicity caused by various ototoxic drugs leading to cellular oxidative stress, not limited to aminoglycoside antibiotics.
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Affiliation(s)
- Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Jeong-In Baek
- Department of Companion Animal Health, College of Rehabilitation and Health, Daegu Haany University, Gyeongsan, 38610, Republic of Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Republic of Korea.
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, 41566, Republic of Korea.
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Baek JI, Kim YR, Lee KY, Kim UK. Mitochondrial redox system: A key target of antioxidant therapy to prevent acquired sensorineural hearing loss. Front Pharmacol 2023; 14:1176881. [PMID: 37063286 PMCID: PMC10102650 DOI: 10.3389/fphar.2023.1176881] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 03/22/2023] [Indexed: 04/03/2023] Open
Abstract
Noise (noise-induced hearing loss), and ototoxic drugs (drug-induced ototoxicity), and aging (age-related hearing loss) are the major environmental factors that lead to acquired sensorineural hearing loss. So far, there have been numerous efforts to develop protective or therapeutic agents for acquired hearing loss by investigating the pathological mechanisms of each types of hearing loss, especially in cochlear hair cells and auditory nerves. Although there is still a lack of information on the underlying mechanisms of redox homeostasis and molecular redox networks in hair cells, an imbalance in mitochondrial reactive oxygen species (ROS) levels that enhance oxidative stress has been suggested as a key pathological factor eventually causing acquired sensorineural hearing loss. Thus, various types of antioxidants have been investigated for their abilities to support auditory cells in maintenance of the hearing function against ototoxic stimuli. In this review, we will discuss the scientific possibility of developing drugs that target particular key elements of the mitochondrial redox network in prevention or treatment of noise- and ototoxic drug-induced hearing loss.
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Affiliation(s)
- Jeong-In Baek
- Department of Companion Animal Health, College of Rehabilitation and Health, Daegu Haany University, Gyeongsan, Republic of Korea
| | - Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
- Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, Republic of Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
- School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
- *Correspondence: Un-Kyung Kim,
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Kim YR, Kim HM, Lee B, Baek JI, Lee KY, Park HJ, Kim UK. Identification of novel missense mutation related with non-syndromic sensorineural deafness, DFNA11 in korean family by NGS. Genes Genomics 2023; 45:225-230. [PMID: 36630074 DOI: 10.1007/s13258-022-01357-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 12/17/2022] [Indexed: 01/12/2023]
Abstract
BACKGOUND Hereditary hearing loss is one of the most common genetically heterogeneous defects in human. About 70% of hereditary hearing loss is defined as non-syndromic hearing loss showing loss of hearing ability without any other symptoms. Up to date, the identified genes associated with non-syndromic hearing loss are 128, including 52 genes for DFNA and 76 genes for DFNB. Because of high levels of heterogeneity, it is difficult to identify the causative factors for hearing loss using Sanger sequencing. OBJECTIVE Our aim was to detect causative factors and investigate pathogenic mutations, which co-segregates within the candidate family. METHODS We used Next Generation Sequencing technique to investigate whole-exome sequences of a Korean family with non-syndromic hereditary hearing loss. The family showed autosomal dominant inheritance pattern. RESULTS We identified a novel missense variation, c.1978G > A in MYO7A gene, in the family with the autosomal dominant inheritance pattern. c.1978G > A produced Gly660Arg in the motor head domain of Myosin VIIA disrupt the ATP- and actin-binding motif function. CONCLUSION This study is the first to report pathogenic mutations within MYO7A gene in Korean family and our data would facilitate diagnosing the primary cause of hereditary hearing loss in Korean.
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Affiliation(s)
- Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, Republic of Korea
| | - Hye-Min Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea
| | - Byeonghyeon Lee
- New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea
| | - Jeong-In Baek
- Department of Companion Animal Health, College of Rehabilitation and Health, Deagu Haany University, Gyeongsan, Republic of Korea
| | - Kyu-Yup Lee
- Department of Internal Medicine, Research Institute of Aging and Metabolism, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | | | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea. .,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea.
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Kim JH, Baek JI, Lee IK, Kim UK, Kim YR, Lee KY. Protective effect of berberine chloride against cisplatin-induced ototoxicity. Genes Genomics 2021; 44:1-7. [PMID: 34800260 PMCID: PMC8727421 DOI: 10.1007/s13258-021-01157-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 08/13/2021] [Indexed: 11/10/2022]
Abstract
Background Cisplatin (CP) is an effective anticancer drug broadly used for various types of cancers, but it has shown ototoxicity that results from oxidative stress. Berberine has been reported for its anti-oxidative stress suggesting its therapeutic potential for many diseases such as colitis, diabetes, and vascular dementia. Objective Organ of Corti of postnatal day 3 mouse cochlear explants were used to compare hair cells after the treatment with cisplatin alone or with berberine chloride (BC) followed by CP. Methods We investigated the potential of the anti-oxidative effect of BC against the cisplatin-induced ototoxicity. We observed a reduced aberrant bundle of stereocilia in hair cells in CP with BC pre-treated group. Caspase-3 immunofluorescence and TUNEL assay supported the hypothesis that BC attenuates the apoptotic signals induced by CP. Reactive oxygen species level in the mitochondria were investigated by MitoSOX Red staining and the mitochondrial membrane potentials were compared by JC-1 assay. Results BC decreased ROS generation with preserved mitochondrial membrane potentials in mitochondria as well as reduced DNA fragmentation in hair cells. In summary, our data indicate that BC might act as antioxidant against CP by reducing the stress in mitochondria resulting in cell survival. Conclusion Our result suggests the therapeutic potential of BC for prevention of the detrimental effect of CP-induced ototoxicity.
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Affiliation(s)
- Jong-Heun Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Jeong-In Baek
- Department of Aroma-Applied Industry, College of Herbal Bio-Industry, Daegu Haany University, Gyeongsan, 38610, Republic of Korea
| | - In-Kyu Lee
- Department of Internal Medicine, Research Institute of Aging and Metabolism, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea. .,Advanced Bio-Resource Research Center, Kyungpook National University, Daegu, Republic of Korea.
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea.
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Lee HS, Kim YR, Lee IK, Kim UK, Baek JI, Lee KY. KL1333, a derivative of β-lapachone, protects against cisplatin-induced ototoxicity in mouse cochlear cultures. Biomed Pharmacother 2020; 126:110068. [DOI: 10.1016/j.biopha.2020.110068] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 02/27/2020] [Accepted: 03/03/2020] [Indexed: 10/24/2022] Open
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Lee B, Kim YR, Kim SJ, Goh SH, Kim JH, Oh SK, Baek JI, Kim UK, Lee KY. Modified U1 snRNA and antisense oligonucleotides rescue splice mutations in SLC26A4 that cause hereditary hearing loss. Hum Mutat 2019; 40:1172-1180. [PMID: 31033086 DOI: 10.1002/humu.23774] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 04/15/2019] [Accepted: 04/23/2019] [Indexed: 11/11/2022]
Abstract
One of most important factors for messenger RNA (mRNA) transcription is the spliceosomal component U1 small nuclear RNA (snRNA), which recognizes 5' splicing donor sites at specific regions in pre-mRNA. Mutations in these sites disrupt U1 snRNA binding and cause abnormal splicing. In this study, we investigated mutations at splice sites in SLC26A4 (HGNC 8818), one of the major causative genes of hearing loss, which may result in the synthesis of abnormal pendrin, the channel protein encoded by the gene. Seventeen SLC26A4 variants with mutations in the U1 snRNA binding sites were assessed by minigene splicing assays, and 11 were found to result in abnormal splicing. Interestingly, eight of the 11 pathogenic mutations were intronic, suggesting the importance of conserved sequences at the intronic splice site. The application of modified U1 snRNA effectively rescued the abnormal splicing for most of these mutations. Although three were cryptic mutations, they were rescued by cotransfection of modified U1 snRNA and modified antisense oligonucleotides. Our results demonstrate the important role of snRNA in SLC26A4 mutations, suggesting the therapeutic potential of modified U1 snRNA and antisense oligonucleotides for neutralizing the pathogenic effect of the splice-site mutations that may result in hearing loss.
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Affiliation(s)
- Byeonghyeon Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,BK21 Plus KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,BK21 Plus KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Sang-Joo Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,BK21 Plus KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Sung-Ho Goh
- Therapeutic Target Discovery Branch, National Cancer Center, Goyang-si, Gyeonggi-do, Republic of Korea
| | - Jong-Heun Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,BK21 Plus KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Se-Kyung Oh
- Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea
| | - Jeong-In Baek
- Department of Aroma-Applied Industry, Daegu Haany University, Gyeongsan, Republic of Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea.,BK21 Plus KNU Creative BioResearch Group, School of Life Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
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Lee B, Baek JI, Min H, Bae SH, Moon K, Kim MA, Kim YR, Fogelgren B, Lipschutz JH, Lee KY, Bok J, Kim UK. Correction to: Exocyst Complex Member EXOC5 Is Required for Survival of Hair Cells and Spiral Ganglion Neurons and Maintenance of Hearing. Mol Neurobiol 2019; 56:2300. [PMID: 30637586 DOI: 10.1007/s12035-019-1470-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The original article contains an error for a grant number in the Acknowledgements section.
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Affiliation(s)
- Byeonghyeon Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Jeong-In Baek
- Department of Aroma-applied Industry, Daegu Haany University, Gyeongsan, 38610, Republic of Korea.,Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA
| | - Hyehyun Min
- Department of Anatomy, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Seung-Hyun Bae
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Kyeonghye Moon
- Department of Anatomy, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea.,BK21PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Min-A Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Ben Fogelgren
- Department of Anatomy, Biochemistry, and Physiology, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI, 96813, USA
| | - Joshua H Lipschutz
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, USA.,Department of Medicine, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, SC, 29401, USA
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea
| | - Jinwoong Bok
- Department of Anatomy, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea. .,BK21PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea. .,Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea.
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea. .,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea.
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Kim YR, Baek JI, Kim SH, Kim MA, Lee B, Ryu N, Kim KH, Choi DG, Kim HM, Murphy MP, Macpherson G, Choo YS, Bok J, Lee KY, Park JW, Kim UK. Therapeutic potential of the mitochondria-targeted antioxidant MitoQ in mitochondrial-ROS induced sensorineural hearing loss caused by Idh2 deficiency. Redox Biol 2018; 20:544-555. [PMID: 30508699 PMCID: PMC6279977 DOI: 10.1016/j.redox.2018.11.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 11/15/2018] [Accepted: 11/18/2018] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial NADP+-dependent isocitrate dehydrogenase 2 (IDH2) is a major NADPH-producing enzyme which is essential for maintaining the mitochondrial redox balance in cells. We sought to determine whether IDH2 deficiency induces mitochondrial dysfunction and modulates auditory function, and investigated the protective potential of an antioxidant agent against reactive oxygen species (ROS)-induced cochlear damage in Idh2 knockout (Idh2−/−) mice. Idh2 deficiency leads to damages to hair cells and spiral ganglion neurons (SGNs) in the cochlea and ultimately to apoptotic cell death and progressive sensorineural hearing loss in Idh2−/− mice. Loss of IDH2 activity led to decreased levels of NADPH and glutathione causing abnormal ROS accumulation and oxidative damage, which might trigger apoptosis signal in hair cells and SGNs in Idh2−/− mice. We performed ex vivo experiments to determine whether administration of mitochondria-targeted antioxidants might protect or induce recovery of cells from ROS-induced apoptosis in Idh2-deficient mouse cochlea. MitoQ almost completely neutralized the H2O2-induced ototoxicity, as the survival rate of Idh2−/− hair cells were restored to normal levels. In addition, the lack of IDH2 led to the accumulation of mitochondrial ROS and the depolarization of ΔΨm, resulting in hair cell loss. In the present study, we identified that IDH2 is indispensable for the functional maintenance and survival of hair cells and SGNs. Moreover, the hair cell degeneration caused by IDH2 deficiency can be prevented by MitoQ, which suggests that Idh2−/− mice could be a valuable animal model for evaluating the therapeutic effects of various antioxidant candidates to overcome ROS-induced hearing loss.
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Affiliation(s)
- Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Jeong-In Baek
- Department of Aroma-Applied Industry, College of Herbal Bio-industry, Daegu Haany University, Gyeongsan, Republic of Korea
| | - Sung Hwan Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Min-A Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Byeonghyeon Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Nari Ryu
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Kyung-Hee Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Deok-Gyun Choi
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Hye-Min Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea
| | - Michael P Murphy
- Medical Research Council (MRC)-Mitochondrial Biology Unit, University of Cambridge, Cambridge CB2 0XY, United Kingdom
| | - Greg Macpherson
- Antipodean Pharmaceuticals Inc, L2 14 Viaduct Harbour Rd, Auckland, New Zealand
| | - Yeon-Sik Choo
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea
| | - Jinwoong Bok
- Department of Anatomy, Yonsei University College of Medicine, Seoul, Republic of Korea; BK21PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea; Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Republic of Korea.
| | - Jeen-Woo Park
- School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea; Department of Biochemistry, School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu 41566, Republic of Korea.
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, KNU Creative BioResearch Group (BK21 Plus Project), Kyungpook National University, Daegu, Republic of Korea.
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Kim KH, Lee B, Kim YR, Kim MA, Ryu N, Jung DJ, Kim UK, Baek JI, Lee KY. Evaluating protective and therapeutic effects of alpha-lipoic acid on cisplatin-induced ototoxicity. Cell Death Dis 2018; 9:827. [PMID: 30068942 PMCID: PMC6070527 DOI: 10.1038/s41419-018-0888-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 07/07/2018] [Accepted: 07/17/2018] [Indexed: 11/09/2022]
Abstract
Cisplatin, a small platinum-containing molecule, is a widely used, highly effective anticancer drug. However, severe side effects have been found in cancer patients treated with cisplatin, including nephrotoxicity, neurotoxicity, and ototoxicity. These cisplatin-induced side effects can have a major impact on patient quality of life, including social development problems in pediatric patients that develop hearing loss. Previous studies have suggested that the major cause of cisplatin-induced ototoxicity is abnormal accumulation of reactive oxygen species (ROS) and oxidative stress. Alpha-lipoic acid (ALA), one of the most effective antioxidants, is known to be involved in the cellular antioxidant system and may have a protective effect on cisplatin-induced ototoxicity. However, the therapeutic effect of ALA on damaged hearing function and its detailed mechanism of action are not fully understood. This study focused on determining whether ALA has a potential as a protective and/or therapeutic agent for cisplatin-induced ototoxicity. Histological and physiological analyses were performed using cisplatin-treated mouse cochlea and HEI-OC1 culture cells in pre- and post-treatment with ALA in vitro and in vivo. We found that ALA contributes to protecting mitochondrial function by preventing ROS accumulation and inhibiting apoptotic cell death. Importantly, post-treatment with ALA consistently showed an almost equal restorative effect to pretreatment, in vitro and in vivo, supporting the possible use of ALA as a therapeutic agent for cisplatin-induced ototoxicity. This study is the first report on a strong therapeutic potential of ALA to rescue ototoxic hearing loss caused by cisplatin, and our data provide key evidence that ALA may act as a reducing agent for glutathione disulfide to increase glutathione levels on behalf of glutathione reductase. This result was consistent in both cultured cells and the mouse model, which improves the clinical value of ALA for therapy of cisplatin-induced ototoxicity.
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Affiliation(s)
- Kyung-Hee Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Byeonghyeon Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Ye-Ri Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Min-A Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Nari Ryu
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Da Jung Jung
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea. .,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, 41566, Republic of Korea.
| | - Jeong-In Baek
- Department of Aroma-Applied Industry, Daegu Haany University, Gyeongsan, 38610, Republic of Korea.
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea.
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Ryu N, Lee S, Park HJ, Lee B, Kwon TJ, Bok J, Park CI, Lee KY, Baek JI, Kim UK. Identification of a novel splicing mutation within SLC17A8 in a Korean family with hearing loss by whole-exome sequencing. Gene 2017. [PMID: 28647561 DOI: 10.1016/j.gene.2017.06.040] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Hereditary hearing loss (HHL) is a common genetically heterogeneous disorder, which follows Mendelian inheritance in humans. Because of this heterogeneity, the identification of the causative gene of HHL by linkage analysis or Sanger sequencing have shown economic and temporal limitations. With recent advances in next-generation sequencing (NGS) techniques, rapid identification of a causative gene via massively parallel sequencing is now possible. We recruited a Korean family with three generations exhibiting autosomal dominant inheritance of hearing loss (HL), and the clinical information about this family revealed that there are no other symptoms accompanied with HL. To identify a causative mutation of HL in this family, we performed whole-exome sequencing of 4 family members, 3 affected and an unaffected. As the result, A novel splicing mutation, c.763+1G>T, in the solute carrier family 17, member 8 (SLC17A8) gene was identified in the patients, and the genotypes of the mutation were co-segregated with the phenotype of HL. Additionally, this mutation was not detected in 100 Koreans with normal hearing. Via NGS, we detected a novel splicing mutation that might influence the hearing ability within the patients with autosomal dominant non-syndromic HL. Our data suggests that this technique is a powerful tool to discover causative genetic factors of HL and facilitate diagnoses of the primary cause of HHL.
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Affiliation(s)
- Nari Ryu
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea
| | - Seokwon Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea
| | | | - Byeonghyeon Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea
| | - Tae-Jun Kwon
- Laboratory Animal Center, Daegu-Gyeongbuk Medical Innovation Foundation (DGMIF), Daegu, Republic of Korea
| | - Jinwoong Bok
- Department of Anatomy, Yonsei University College of Medicine, Seoul, Republic of Korea; Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Republic of Korea; BK21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Chan Ik Park
- Department of Aroma-applied Industry, Daegu Haany University, Gyeongsan, Republic of Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Jeong-In Baek
- Department of Aroma-applied Industry, Daegu Haany University, Gyeongsan, Republic of Korea.
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Republic of Korea; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Republic of Korea.
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Kim SJ, Lee S, Park HJ, Kang TH, Sagong B, Baek JI, Oh SK, Choi JY, Lee KY, Kim UK. Genetic association of MYH genes with hereditary hearing loss in Korea. Gene 2016; 591:177-182. [DOI: 10.1016/j.gene.2016.07.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 06/15/2016] [Accepted: 07/04/2016] [Indexed: 01/12/2023]
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Sagong B, Baek JI, Lee KY, Kim UK. A Novel Frameshift Mutation of SLC26A4 in a Korean Family With Nonsyndromic Hearing Loss and Enlarged Vestibular Aqueduct. Clin Exp Otorhinolaryngol 2016; 10:50-55. [PMID: 27384033 PMCID: PMC5327591 DOI: 10.21053/ceo.2016.00430] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 05/22/2016] [Accepted: 05/26/2016] [Indexed: 11/23/2022] Open
Abstract
Objectives We aimed to identify the causative mutation for siblings in a Korean family with nonsyndromic hearing loss (HL) and enlarged vestibular aqueduct (EVA). The siblings were a 19-year-old female with bilateral profound HL and an 11-year-old male with bilateral moderately severe HL. Methods We extracted genomic DNA from blood samples of the siblings with HL, their parents, and 100 controls. We performed mutation analysis for SLC26A4 using direct sequencing. Results The two siblings were compound heterozygotes with the novel mutation p.I713LfsX8 and the previously described mutation p.H723R. Their parents had heterozygous mono-allelic mutations. Father had p.I713LfsX8 mutation as heterozygous, and mother had p.H723R mutation as heterozygous. However, novel mutation p.I713LfsX8 was not detected in 100 unrelated controls. Conclusion Both mutations identified in this study were located in the sulfate transporter and anti-sigma factor antagonist domain, the core region for membrane targeting of SulP/SLC26 anion transporters, which strongly suggests that failure in membrane trafficking by SLC26A4 is a direct cause of HL in this family. Our study could therefore provide a foundation for further investigations elucidating the SLC26A4-related mechanisms of HL.
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Affiliation(s)
- Borum Sagong
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Korea
| | - Jeong-In Baek
- Department of Aroma Applied Industry, College of Herbal Bio-Industry, Daegu Haany University, Gyeongsan, Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Kyungpook National University School of Medicine, Daegu, Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Korea.,School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, Korea
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Baek JI, Kwon SH, Zuo X, Choi SY, Kim SH, Lipschutz JH. Dynamin Binding Protein (Tuba) Deficiency Inhibits Ciliogenesis and Nephrogenesis in Vitro and in Vivo. J Biol Chem 2016; 291:8632-43. [PMID: 26895965 DOI: 10.1074/jbc.m115.688663] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Indexed: 12/31/2022] Open
Abstract
Dysfunction of renal primary cilia leads to polycystic kidney disease. We previously showed that the exocyst, a protein trafficking complex, is essential for ciliogenesis and regulated by multiple Rho and Rab family GTPases, such as Cdc42. Cdc42 deficiency resulted in a disruption of renal ciliogenesis and a polycystic kidney disease phenotype in zebrafish and mice. Here we investigate the role of Dynamin binding protein (also known as Tuba), a Cdc42-specific guanine nucleotide exchange factor, in ciliogenesis and nephrogenesis using Tuba knockdown Madin-Darby canine kidney cells and tuba knockdown in zebrafish. Tuba depletion resulted in an absence of cilia, with impaired apical polarization and inhibition of hepatocyte growth factor-induced tubulogenesis in Tuba knockdown Madin-Darby canine kidney cell cysts cultured in a collagen gel. In zebrafish, tuba was expressed in multiple ciliated organs, and, accordingly, tuba start and splice site morphants showed various ciliary mutant phenotypes in these organs. Co-injection of tuba and cdc42 morpholinos at low doses, which alone had no effect, resulted in genetic synergy and led to abnormal kidney development with highly disorganized pronephric duct cilia. Morpholinos targeting two other guanine nucleotide exchange factors not known to be in the Cdc42/ciliogenesis pathway and a scrambled control morpholino showed no phenotypic effect. Given the molecular nature of Cdc42 and Tuba, our data strongly suggest that tuba and cdc42 act in the same ciliogenesis pathway. Our study demonstrates that Tuba deficiency causes an abnormal renal ciliary and morphogenetic phenotype. Tuba most likely plays a critical role in ciliogenesis and nephrogenesis by regulating Cdc42 activity.
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Affiliation(s)
- Jeong-In Baek
- From the Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425 and
| | - Sang-Ho Kwon
- From the Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425 and
| | - Xiaofeng Zuo
- From the Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425 and
| | - Soo Young Choi
- From the Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425 and
| | - Seok-Hyung Kim
- From the Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425 and
| | - Joshua H Lipschutz
- From the Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425 and the Department of Medicine, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, South Carolina 29401
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Sagong B, Baek JI, Bok J, Lee KY, Kim UK. Identification of a nonsense mutation in the STRC gene in a Korean family with moderate hearing loss. Int J Pediatr Otorhinolaryngol 2016; 80:78-81. [PMID: 26746617 DOI: 10.1016/j.ijporl.2015.11.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Revised: 10/26/2015] [Accepted: 11/17/2015] [Indexed: 12/28/2022]
Abstract
Hereditary hearing loss is a heterogeneous disorder that results in a common sensorineural disorder. To date, more than 150 loci and 89 genes have been reported for non-syndromic hearing loss. Next generation sequencing has recently been developed as a powerful genetic strategy for identifying pathogenic mutations in heterogeneous disorders with various causative genes. In this study, we performed targeted sequencing to identify the causative mutation in a Korean family that had moderate hearing loss. We targeted 64 genes associated with non-syndromic hearing loss and sorted the homozygous variations according to the autosomal recessive inheritance pattern of the family. Implementing a bioinformatic platform for filtering and detecting variations allowed for the identification of two variations within different genes (c.650G>A in TRIOBP and c.4057C>T in STRC). These variants were selected for further analysis. Among these, c.4057C>T (p.Q1353X) was a divergent sequence variation between the STRC gene and the STRC pseudogene. This was the critical difference that resulted in loss of the protein-coding ability of the pseudogene. Therefore, we hypothesized that the p.Q1353X variation in the STRC gene is the causative mutation for hearing loss. This result suggests that application of targeted sequencing will be valuable for the diagnosis of heterogeneous disorders.
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Affiliation(s)
- Borum Sagong
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Jeong-In Baek
- Division of Nephrology, Medical University of South Carolina, Charleston, SC, USA
| | - Jinwoong Bok
- Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, South Korea.
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea; School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea.
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15
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Kang TH, Baek JI, Sagong B, Park HJ, Park CI, Lee KY, Kim UK. A novel missense variant in the DIAPH1 gene in a Korean family with autosomal dominant nonsyndromic hearing loss. Genes Genet Syst 2016; 91:289-292. [DOI: 10.1266/ggs.16-00041] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- Tae-Hun Kang
- Department of Biology, College of Natural Sciences, Kyungpook National University
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University
| | - Jeong-In Baek
- Department of Aroma Applied Industry, College of Herbal Bio-industry, Daegu Haany University
| | - Borum Sagong
- Department of Biology, College of Natural Sciences, Kyungpook National University
| | | | - Chan Ik Park
- Department of Aroma Applied Industry, College of Herbal Bio-industry, Daegu Haany University
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology–Head and Neck Surgery, School of Medicine, Kyungpook National University
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University
- School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University
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16
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Choi SY, Baek JI, Zuo X, Kim SH, Dunaief JL, Lipschutz JH. Cdc42 and sec10 Are Required for Normal Retinal Development in Zebrafish. Invest Ophthalmol Vis Sci 2015; 56:3361-70. [PMID: 26024121 DOI: 10.1167/iovs.14-15692] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To characterize the function and mechanisms of cdc42 and sec10 in eye development in zebrafish. METHODS Knockdown of zebrafish cdc42 and sec10 was carried out using antisense morpholino injection. The phenotype of morphants was characterized by histology, immunohistology, and transmission electron microscopy (TEM). To investigate a synergistic genetic interaction between cdc42 and sec10, we titrated suboptimal doses of cdc42 and sec10 morpholinos, and coinjected both morpholinos. To study trafficking, a melanosome transport assay was performed using epinephrine. RESULTS Cdc42 and sec10 knockdown in zebrafish resulted in both abnormal eye development and increased retinal cell death. Cdc42 morphants had a relatively normal retinal structure, aside from the absence of most connecting cilia and outer segments, whereas in sec10 morphants, much of the outer nuclear layer, which is composed of the photoreceptor nuclei, was missing and RPE cell thickness was markedly irregular. Knockdown of cdc42 and sec10 also resulted in an intracellular transport defect affecting retrograde melanosome transport. Furthermore, there was a synergistic genetic interaction between zebrafish cdc42 and sec10, suggesting that cdc42 and sec10 act in the same pathway in retinal development. CONCLUSIONS We propose a model whereby sec10 and cdc42 play a central role in development of the outer segment of the retinal photoreceptor cell by trafficking proteins necessary for ciliogenesis.
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Affiliation(s)
- Soo Young Choi
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Jeong-In Baek
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Xiaofeng Zuo
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Seok-Hyung Kim
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States
| | - Joshua L Dunaief
- F.M. Kirby Center for Molecular Ophthalmology, Scheie Eye Institute, Department of Ophthalmology, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Joshua H Lipschutz
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina, United States 3Department of Medicine, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, South Carolina, United States
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Oh SK, Shin JO, Baek JI, Lee J, Bae JW, Ankamerddy H, Kim MJ, Huh TL, Ryoo ZY, Kim UK, Bok J, Lee KY. Pannexin 3 is required for normal progression of skeletal development in vertebrates. FASEB J 2015; 29:4473-84. [PMID: 26183770 DOI: 10.1096/fj.15-273722] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Accepted: 06/30/2015] [Indexed: 12/25/2022]
Abstract
The vertebrate skeletal system has various functions, including support, movement, protection, and the production of blood cells. The development of cartilage and bones, the core components of the skeletal system, is mediated by systematic inter- and intracellular communication among multiple signaling pathways in differentiating progenitors and the surrounding tissues. Recently, Pannexin (Panx) 3 has been shown to play important roles in bone development in vitro by mediating multiple signaling pathways, although its roles in vivo have not been explored. In this study, we generated and analyzed Panx3 knockout mice and examined the skeletal phenotypes of panx3 morphant zebrafish. Panx3(-/-) embryos exhibited delays in hypertrophic chondrocyte differentiation and osteoblast differentiation as well as the initiation of mineralization, resulting in shortened long bones in adulthood. The abnormal progression of hypertrophic chondrogenesis appeared to be associated with the sustained proliferation of chondrocytes, which resulted from increased intracellular cAMP levels. Similarly, osteoblast differentiation and mineralization were delayed in panx3 morphant zebrafish. Taken together, our results provide evidence of the crucial roles of Panx3 in vertebrate skeletal development in vivo.
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Affiliation(s)
- Se-Kyung Oh
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jeong-Oh Shin
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jeong-In Baek
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jinwook Lee
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jae Woong Bae
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Harinarayana Ankamerddy
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Myoung-Jin Kim
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Tae-Lin Huh
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Zae-Young Ryoo
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Un-Kyung Kim
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Jinwoong Bok
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Kyu-Yup Lee
- *Department of Biology, College of Natural Sciences, School of Life Sciences, BrainKorea21 PLUS Project for Kyungpook National University Creative BioResearch Group, School of Life Science and Biotechnology, and Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea; Department of Anatomy, BrainKorea21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea; and Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Bae SH, Robertson NG, Cho HJ, Morton CC, Jung DJ, Baek JI, Choi SY, Lee J, Lee KY, Kim UK. Identification of pathogenic mechanisms of COCH mutations, abolished cochlin secretion, and intracellular aggregate formation: genotype-phenotype correlations in DFNA9 deafness and vestibular disorder. Hum Mutat 2015; 35:1506-1513. [PMID: 25230692 DOI: 10.1002/humu.22701] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 09/08/2014] [Indexed: 11/06/2022]
Abstract
Mutations in COCH (coagulation factor C homology) cause autosomal-dominant nonsyndromic hearing loss with variable degrees of clinical onset and vestibular malfunction. We selected eight uncharacterized mutations and performed immunocytochemical and Western blot analyses to track cochlin through the secretory pathway. We then performed a comprehensive analysis of clinical information from DFNA9 patients with all 21 known COCH mutations in conjunction with cellular and molecular findings to identify genotype-phenotype correlations. Our studies revealed that five mutants were not secreted into the media: two von Willebrand factor A (vWFA) domain mutants, which were not transported from the endoplasmic reticulum to Golgi complex and formed high-molecular-weight aggregates in cell lysates, and three LCCL domain mutants, which were detected as intracellular dimeric cochlins. Mutant cochlins that were not secreted and accumulated in cells result in earlier age of onset of hearing defects. In addition, individuals with LCCL domain mutations show accompanying vestibular dysfunction, whereas those with vWFA domain mutations exhibit predominantly hearing loss. This is the first report showing failure of mutant cochlin transport through the secretory pathway, abolishment of cochlin secretion, and formation and retention of dimers and large multimeric intracellular aggregates, and high correlation with earlier onset and progression of hearing loss in individuals with these DFNA9-causing mutations.
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Affiliation(s)
- Seung-Hyun Bae
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea.,School of Life Sciences, KNU Creative BioResearch Group (BK21 plus program), Kyungpook National University
| | - Nahid G Robertson
- Department of Obstetrics & Gynecology, Brigham & Women's Hospital, Boston, MA, USA
| | - Hyun-Ju Cho
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Cynthia C Morton
- Departments of Obstetrics & Gynecology and Pathology, Brigham & Women's Hospital, Harvard Medical School, Boston, MA, Broad Institute, Cambridge, MA, USA
| | - Da Jung Jung
- Department of Otolaryngology, College of Medicine, Kyungpook National University, Daegu, South Korea
| | - Jeong-In Baek
- Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Soo-Young Choi
- Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jaetae Lee
- Department of Nuclear Medicine, Kyungpook National University School of Medicine, Daegu, Republic of Korea
| | - Kyu-Yup Lee
- Department of Otolaryngology, College of Medicine, Kyungpook National University, Daegu, South Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea.,School of Life Sciences, KNU Creative BioResearch Group (BK21 plus program), Kyungpook National University
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Kim SH, Wu SY, Baek JI, Choi SY, Su Y, Flynn CR, Gamse JT, Ess KC, Hardiman G, Lipschutz JH, Abumrad NN, Rockey DC. A post-developmental genetic screen for zebrafish models of inherited liver disease. PLoS One 2015; 10:e0125980. [PMID: 25950913 PMCID: PMC4423964 DOI: 10.1371/journal.pone.0125980] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 03/27/2015] [Indexed: 02/07/2023] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is one of the most common causes of chronic liver disease such as simple steatosis, nonalcoholic steatohepatitis (NASH), cirrhosis and fibrosis. However, the molecular pathogenesis and genetic variations causing NAFLD are poorly understood. The high prevalence and incidence of NAFLD suggests that genetic variations on a large number of genes might be involved in NAFLD. To identify genetic variants causing inherited liver disease, we used zebrafish as a model system for a large-scale mutant screen, and adopted a whole genome sequencing approach for rapid identification of mutated genes found in our screen. Here, we report on a forward genetic screen of ENU mutagenized zebrafish. From 250 F2 lines of ENU mutagenized zebrafish during post-developmental stages (5 to 8 days post fertilization), we identified 19 unique mutant zebrafish lines displaying visual evidence of hepatomegaly and/or steatosis with no developmental defects. Histological analysis of mutants revealed several specific phenotypes, including common steatosis, micro/macrovesicular steatosis, hepatomegaly, ballooning, and acute hepatocellular necrosis. This work has identified multiple post-developmental mutants and establishes zebrafish as a novel animal model for post-developmental inherited liver disease.
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Affiliation(s)
- Seok-Hyung Kim
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
- * E-mail:
| | - Shu-Yu Wu
- Department of Biology, Vanderbilt University, Nashville, TN, 37232, the United States of America
| | - Jeong-In Baek
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
| | - Soo Young Choi
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
| | - Yanhui Su
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
| | - Charles R. Flynn
- Department of Surgery, Vanderbilt University, Nashville, TN, 37232, the United States of America
| | - Joshua T. Gamse
- Department of Biology, Vanderbilt University, Nashville, TN, 37232, the United States of America
| | - Kevin C. Ess
- Department of Pediatrics, Vanderbilt University, Nashville, TN, 37232, the United States of America
| | - Gary Hardiman
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
| | - Joshua H. Lipschutz
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
- Department of Medicine, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, SC, 29401, the United States of America
| | - Naji N. Abumrad
- Department of Surgery, Vanderbilt University, Nashville, TN, 37232, the United States of America
| | - Don C. Rockey
- Department of Medicine, Medical University of South Carolina, Charleston, SC, 29425, the United States of America
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Fogelgren B, Zuo X, Buonato JM, Vasilyev A, Baek JI, Choi SY, Chacon-Heszele MF, Palmyre A, Polgar N, Drummond I, Park KM, Lazzara MJ, Lipschutz JH. Exocyst Sec10 protects renal tubule cells from injury by EGFR/MAPK activation and effects on endocytosis. Am J Physiol Renal Physiol 2014; 307:F1334-41. [PMID: 25298525 DOI: 10.1152/ajprenal.00032.2014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Acute kidney injury is common and has a high mortality rate, and no effective treatment exists other than supportive care. Using cell culture models, we previously demonstrated that exocyst Sec10 overexpression reduced damage to renal tubule cells and speeded recovery and that the protective effect was mediated by higher basal levels of mitogen-activated protein kinase (MAPK) signaling. The exocyst, a highly-conserved eight-protein complex, is known for regulating protein trafficking. Here we show that the exocyst biochemically interacts with the epidermal growth factor receptor (EGFR), which is upstream of MAPK, and Sec10-overexpressing cells express greater levels of phosphorylated (active) ERK, the final step in the MAPK pathway, in response to EGF stimulation. EGFR endocytosis, which has been linked to activation of the MAPK pathway, increases in Sec10-overexpressing cells, and gefitinib, a specific EGFR inhibitor, and Dynasore, a dynamin inhibitor, both reduce EGFR endocytosis. In turn, inhibition of the MAPK pathway reduces ligand-mediated EGFR endocytosis, suggesting a potential feedback of elevated ERK activity on EGFR endocytosis. Gefitinib also decreases MAPK signaling in Sec10-overexpressing cells to levels seen in control cells and, demonstrating a causal role for EGFR, reverses the protective effect of Sec10 overexpression following cell injury in vitro. Finally, using an in vivo zebrafish model of acute kidney injury, morpholino-induced knockdown of sec10 increases renal tubule cell susceptibility to injury. Taken together, these results suggest that the exocyst, acting through EGFR, endocytosis, and the MAPK pathway is a candidate therapeutic target for acute kidney injury.
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Affiliation(s)
- Ben Fogelgren
- Departments of Anatomy, Biochemistry, and Physiology, University of Hawaii at Manoa, Honolulu, Hawaii
| | - Xiaofeng Zuo
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Janine M Buonato
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania
| | | | - Jeong-In Baek
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Soo Young Choi
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | | | - Aurélien Palmyre
- Department of Pathology, Harvard Medical School, Boston, Massachusetts
| | - Noemi Polgar
- Departments of Anatomy, Biochemistry, and Physiology, University of Hawaii at Manoa, Honolulu, Hawaii
| | - Iain Drummond
- Departments of Medicine and Genetics, Harvard Medical School, Boston, Massachusetts
| | - Kwon Moo Park
- Department of Anatomy and BK21 Plus, Kyungpook National University School of Medicine, Junggu, Daegu, Republic of Korea; and
| | - Matthew J Lazzara
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Joshua H Lipschutz
- Department of Medicine, Medical University of South Carolina, Charleston, South Carolina; Department of Medicine, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, South Carolina
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Abstract
Cilia, organelles that function as cellular antennae, are central to the pathogenesis of “ciliopathies”, including various forms of polycystic kidney disease (PKD). To date, however, the molecular mechanisms controlling ciliogenesis and ciliary function remain incompletely understood. A recently proposed model of cell–cell communication, called “urocrine signaling”, hypothesizes that a subset of membrane bound vesicles that are secreted into the urinary stream (termed exosome‐like vesicles, or ELVs), carry cilia‐specific proteins as cargo, interact with primary cilia, and affect downstream cellular functions. This study was undertaken to determine the role of the exocyst, a highly conserved eight‐protein trafficking complex, in the secretion and/or retrieval of ELVs. We used Madin–Darby canine kidney (MDCK) cells expressing either Sec10‐myc (a central component of the exocyst complex) or Smoothened‐YFP (a ciliary protein found in ELVs) in experiments utilizing electron gold microscopy and live fluorescent microscopy, respectively. Additionally, human urinary exosomes were isolated via ultracentrifugation and subjected to mass‐spectrometry‐based proteomics analysis to determine the composition of ELVs. We found, as determined by EM, that the exocyst localizes to primary cilia, and is present in vesicles attached to the cilium. Furthermore, the entire exocyst complex, as well as most of its known regulatory GTPases, are present in human urinary ELVs. Finally, in living MDCK cells, ELVs appear to interact with primary cilia using spinning disc confocal microscopy. These data suggest that the exocyst complex, in addition to its role in ciliogenesis, is centrally involved in the secretion and/or retrieval of urinary ELVs. Our data suggest that the exocyst complex, in addition to its role in ciliogenesis that we previously described, is centrally involved in the secretion and/or retrieval of urinary exosomes. These results could have important implications for PKD, other renal diseases, as well as normal kidney homeostasis.
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Affiliation(s)
- Maria F Chacon-Heszele
- Renal, Electrolyte and Hypertension Division, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Soo Young Choi
- Renal Division, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Xiaofeng Zuo
- Renal Division, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Jeong-In Baek
- Renal Division, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
| | - Chris Ward
- Division of Nephrology and Hypertension, Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas
| | - Joshua H Lipschutz
- Renal Division, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina Department of Medicine, Ralph H. Johnson VAMC, Charleston, South Carolina
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22
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Baek JI, Choi SY, Chacon-Heszele MF, Zuo X, Lipschutz JH. Expression of Drosophila forkhead transcription factors during kidney development. Biochem Biophys Res Commun 2014; 446:15-7. [PMID: 24491558 DOI: 10.1016/j.bbrc.2014.01.135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 01/25/2014] [Indexed: 11/17/2022]
Abstract
The Drosophila forkhead (Dfkh) family of transcription factors has over 40 family members. One Dfkh family member, BF2 (aka FoxD1), has been shown, by targeted disruption, to be essential for kidney development. In order to determine if other Dfkh family members were involved in kidney development and to search for new members of this family, reverse transcriptase polymerase chain reaction (RT-PCR) was performed using degenerate primers of the consensus sequence of the DNA binding domain of this family and developing rat kidney RNA. The RT-PCR product was used to probe RNA from a developing rat kidney (neonatal), from a 20-day old kidney, and from an adult kidney. The RT-PCR product hybridized only to a developing kidney RNA transcript of ∼2.3 kb (the size of BF2). A lambda gt10 mouse neonatal kidney library was then screened, using the above-described RT-PCR product as a probe. Three lambda phage clones were isolated that strongly hybridized to the RT-PCR probe. Sequencing of the RT-PCR product and the lambda phage clones isolated from the developing kidney library revealed Dfkh BF2. In summary, only Dfkh family member BF2, which has already been shown to be essential for nephrogenesis, was identified in our screen and no other candidate Dfkh family members were identified.
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Affiliation(s)
- Jeong-In Baek
- Department of Medicine, University of Pennsylvania, and VAMC, Philadelphia, PA 19104, USA
| | - Soo Young Choi
- Department of Medicine, University of Pennsylvania, and VAMC, Philadelphia, PA 19104, USA
| | - Maria F Chacon-Heszele
- Department of Medicine, University of Pennsylvania, and VAMC, Philadelphia, PA 19104, USA
| | - Xiaofeng Zuo
- Department of Medicine, University of Pennsylvania, and VAMC, Philadelphia, PA 19104, USA
| | - Joshua H Lipschutz
- Department of Medicine, University of Pennsylvania, and VAMC, Philadelphia, PA 19104, USA; Department of Medicine, Philadelphia Veterans Affairs Medical Center, Philadelphia, PA 19104, USA.
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Sagong B, Jung DJ, Baek JI, Kim MA, Lee J, Lee SH, Kim UK, Lee KY. Identification of causative mutation in a Korean family with Crouzon syndrome using whole exome sequencing. Ann Clin Lab Sci 2014; 44:476-483. [PMID: 25361936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Craniosynostosis is a heterogeneous disorder that results in a common malformation which causes premature fusion of one or more cranial sutures. Whole-exome sequencing (WES) was recently developed as a powerful genetic strategy for identifying pathogenic mutations of heterogeneous disorders with various causative genes. A 24-year-old woman visited our department for evaluation of persistent hearing impairment and absence of an external auditory canal from birth. In this study, we performed WES to identify the causative mutation in a Korean family who has Crouzon Syndrome (CS). We first focused on 16 genes associated with craniosynostosis and sorted the heterozygous variations according to the autosomal dominant inheritance pattern of her family. After the bioinformatic analysis for filtering and detecting variations, three non-synonymous variations in different genes were selected for additional analysis. Among these, the p.C278F mutation in the FGFR2 gene was only absent from both dbSNP and the 1000 Genomes database. We considered the p.C278F mutation in the FGFR2 gene as the causative mutation for the CS. This result suggests that the application of WES will be valuable for diagnosis of congenital disorders with clinical and genetics heterogeneities.
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Affiliation(s)
- Borum Sagong
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Da Jung Jung
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, South Korea
| | - Jeong-In Baek
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Min-A Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Jaetae Lee
- Department of Nuclear Medicine, School of Medicine, Kyungpook National University, Daegu, South Korea
| | - Sang-Heun Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, South Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea School of Life Sciences, BK21 Plus KNU Creative BioResearch Group, Kyungpook National University, Daegu, South Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, South Korea
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Lee J, Baek JI, Choi JY, Kim UK, Lee SH, Lee KY. Genetic analysis of TMPRSS3 gene in the Korean population with autosomal recessive nonsyndromic hearing loss. Gene 2013; 532:276-80. [PMID: 23958653 DOI: 10.1016/j.gene.2013.07.108] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 07/11/2013] [Accepted: 07/31/2013] [Indexed: 11/19/2022]
Abstract
The TMPRSS3 gene (DFNB8/10), which encodes a transmembrane serine protease, is a common hearing loss gene in several populations. Accurate functions of TMPRSS3 in the hearing pathway are still unknown, but TMPRSS3 has been reported to play a crucial role in inner ear development or maintenance. To date, 16 pathogenic mutations have been identified in many countries, but no mutational studies of the TMPRSS3 gene have been conducted in the Korean hearing loss population. In this study, we performed genetic analysis of TMPRSS3 in 40 unrelated Korean patients with autosomal recessive hearing loss to identify the aspect and frequency of TMPRSS3 gene mutations in the Korean population. A total of 22 variations were detected, including a novel variant (p.V291L) and a previously reported pathogenic mutation (p.A306T). The p.A306T mutation which has been detected in only compound heterozygous state in previous studies was identified in homozygous state for the first time in this study. Moreover, the clinical evaluation identified bilateral dilated vestibules in the patient with p.A306T mutation, and it suggested that p.A306T mutation of the TMPRSS3 gene might be associated with vestibular anomalies. In conclusion, this study investigated that only 2.5% of patients with autosomal recessive hearing loss were related to TMPRSS3 mutations suggesting low prevalence of TMPRSS3 gene in Korean hearing loss population. Also, it will provide the information of genotype-phenotype correlation to understand definite role of TMPRSS3 in the auditory system.
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Affiliation(s)
- Jinwook Lee
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
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25
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Woo HM, Park HJ, Baek JI, Park MH, Kim UK, Sagong B, Koo SK. Whole-exome sequencing identifies MYO15A mutations as a cause of autosomal recessive nonsyndromic hearing loss in Korean families. BMC Med Genet 2013; 14:72. [PMID: 23865914 PMCID: PMC3727941 DOI: 10.1186/1471-2350-14-72] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 07/09/2013] [Indexed: 01/05/2023]
Abstract
Background The genetic heterogeneity of hearing loss makes genetic diagnosis expensive and time consuming using available methods. Whole-exome sequencing has recently been introduced as an alternative approach to identifying causative mutations in Mendelian disorders. Methods To identify the hidden mutations that cause autosomal recessive nonsyndromic hearing loss (ARNSHL), we performed whole-exome sequencing of 13 unrelated Korean small families with ARNSHL who were negative for GJB2 or SLC26A4 mutations. Results We found two novel compound heterozygous mutations, IVS11 + 1 and p.R2146Q, of MYO15A in one (SR903 family) of the 13 families with ARNSHL. In addition to these causative mutations, 13 nonsynonymous variants, including variants with uncertain pathogenicity (SR285 family), were identified in the coding exons of MYO15A from Korean exomes. Conclusion This is the first report of MYO15A mutations in an East Asian population. We suggest that close attention should be paid to this gene when performing genetic testing of patients with hearing loss in East Asia. The present results also indicate that whole-exome sequencing is a valuable method for comprehensive medical diagnosis of a genetically heterogeneous recessive disease, especially in small-sized families.
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Affiliation(s)
- Hae-Mi Woo
- Division of Intractable Diseases, Center for Biomedical Sciences, National Institute of Health, Chungcheongbuk-do 363-951, South Korea
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Song MH, Kwon TJ, Kim HR, Jeon JH, Baek JI, Lee WS, Kim UK, Choi JY. Mutational analysis of EYA1, SIX1 and SIX5 genes and strategies for management of hearing loss in patients with BOR/BO syndrome. PLoS One 2013; 8:e67236. [PMID: 23840632 PMCID: PMC3696009 DOI: 10.1371/journal.pone.0067236] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 05/15/2013] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Branchio-oto-renal (BOR) or branchio-otic (BO) syndrome is one of the most common forms of autosomal dominant syndromic hearing loss. Mutations in EYA1, SIX1 and SIX5 genes have been associated with BOR syndrome. In this study, clinical and genetic analyses were performed in patients with BOR/BO syndrome focusing on auditory manifestations and rehabilitation. METHODS The audiologic manifestations were reviewed in 10 patients with BOR/BO syndrome. The operative findings and hearing outcome were analyzed in patients who underwent middle ear surgeries. The modality and outcome of auditory rehabilitation were evaluated. Genetic analysis was performed for EYA1, SIX1, and SIX5 genes. RESULTS All patients presented with mixed hearing loss. Five patients underwent middle ear surgeries without successful hearing gain. Cochlear implantation performed in two patients resulted in significant hearing improvement. Genetic analysis revealed four novel EYA1 mutations and a large deletion encompassing the EYA1 gene. CONCLUSIONS Auditory rehabilitation in BOR/BO syndrome should be individually tailored keeping in mind the high failure rate after middle ear surgeries. Successful outcome can be expected with cochlear implantations in patients with BOR/BO syndrome who cannot benefit from hearing aids. The novel EYA1 mutations may add to the genotypic and phenotypic spectrum of BOR syndrome in the East Asian population.
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Affiliation(s)
- Mee Hyun Song
- Department of Otorhinolaryngology, Kwandong University College of Medicine, Myongji Hospital, Goyang, South Korea
| | - Tae-Jun Kwon
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Hui Ram Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Ju Hyun Jeon
- Department of Otorhinolaryngology, Inje University College of Medicine, Goyang, South Korea
| | - Jeong-In Baek
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Won-Sang Lee
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- * E-mail: (JYC); (U-KK)
| | - Jae Young Choi
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea
- * E-mail: (JYC); (U-KK)
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Bae SH, Baek JI, Lee JD, Song MH, Kwon TJ, Oh SK, Jeong JY, Choi JY, Lee KY, Kim UK. Genetic analysis of auditory neuropathy spectrum disorder in the Korean population. Gene 2013; 522:65-9. [PMID: 23562982 DOI: 10.1016/j.gene.2013.02.057] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Revised: 02/19/2013] [Accepted: 02/21/2013] [Indexed: 10/27/2022]
Abstract
Auditory neuropathy spectrum disorder (ANSD) is caused by dys-synchronous auditory neural response as a result of impairment of the functions of the auditory nerve or inner hair cells, or synapses between inner hair cells and the auditory nerve. To identify a causative gene causing ANSD in the Korean population, we conducted gene screening of the OTOF, DIAPH3, and PJVK genes in 19 unrelated Korean patients with ANSD. A novel nonsense mutation (p.Y1064X) and a known pathogenic mutation (p.R1939Q) of the OTOF gene were identified in a patient as compound heterozygote. Pedigree analysis for these mutations showed co-segregation of mutation genotype and the disease in the family, and it supported that the p.Y1064X might be a novel genetic cause of autosomal recessive ANSD. A novel missense variant p.K1017R (c.3050A>G) in the DIAPH3 gene was also identified in the heterozygous state. In contrast, no mutation was detected in the PJVK gene. These results indicate that no major causative gene has been reported to date in the Korean population and that pathogenic mutations in undiscovered candidate genes may have an effect on ANSD.
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Affiliation(s)
- Seung-Hyun Bae
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
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Sagong B, Baek JI, Oh SK, Na KJ, Bae JW, Choi SY, Jeong JY, Choi JY, Lee SH, Lee KY, Kim UK. A rapid method for simultaneous screening of multi-gene mutations associated with hearing loss in the Korean population. PLoS One 2013; 8:e57237. [PMID: 23469187 PMCID: PMC3585873 DOI: 10.1371/journal.pone.0057237] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Accepted: 01/18/2013] [Indexed: 12/20/2022] Open
Abstract
Hearing loss (HL) is a congenital disease with a high prevalence, and patients with hearing loss need early diagnosis for treatment and prevention. The GJB2, MT-RNR1, and SLC26A4 genes have been reported as common causative genes of hearing loss in the Korean population and some mutations of these genes are the most common mutations associated with hearing loss. Accordingly, we developed a method for the simultaneous detection of seven mutations (c.235delC of GJB2, c.439A>G, c.919-2A>G, c.1149+3A>G, c.1229C>T, c.2168A>G of SLC26A4, and m.1555A>G of the MT-RNR1 gene) using multiplex SNaPshot minisequencing to enable rapid diagnosis of hereditary hearing loss. This method was confirmed in patients with hearing loss and used for genetic diagnosis of controls with normal hearing and neonates. We found that 4.06% of individuals with normal hearing and 4.32% of neonates were heterozygous carriers. In addition, we detected that an individual is heterozygous for two different mutations of GJB2 and SLC26A4 gene, respectively and one normal hearing showing the heteroplasmy of m.1555A>G. These genotypes corresponded to those determined by direct sequencing. Overall, we successfully developed a robust and cost-effective diagnosis method that detects common causative mutations of hearing loss in the Korean population. This method will be possible to detect up to 40% causative mutations associated with prelingual HL in the Korean population and serve as a useful genetic technique for diagnosis of hearing loss for patients, carriers, neonates, and fetuses.
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Affiliation(s)
- Borum Sagong
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Jeong-In Baek
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Se-Kyung Oh
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Kyung Jin Na
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea
| | - Jae Woong Bae
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
| | - Soo Young Choi
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Ji Yun Jeong
- Department of Endocrinology and Metabolism, Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, South Korea
| | - Jae Young Choi
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, South Korea
| | - Sang-Heun Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Kyungpook National University, Daegu, South Korea
- * E-mail: (KYL); (UKK)
| | - Un-Kyung Kim
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
- * E-mail: (KYL); (UKK)
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Baek JI, Oh SK, Kim DB, Choi SY, Kim UK, Lee KY, Lee SH. Targeted massive parallel sequencing: the effective detection of novel causative mutations associated with hearing loss in small families. Orphanet J Rare Dis 2012; 7:60. [PMID: 22938506 PMCID: PMC3495859 DOI: 10.1186/1750-1172-7-60] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2012] [Accepted: 08/21/2012] [Indexed: 01/24/2023] Open
Abstract
Background Hereditary hearing loss is one of the most common heterogeneous disorders, and genetic variants that can cause hearing loss have been identified in over sixty genes. Most of these hearing loss genes have been detected using classical genetic methods, typically starting with linkage analysis in large families with hereditary hearing loss. However, these classical strategies are not well suited for mutation analysis in smaller families who have insufficient genetic information. Methods Eighty known hearing loss genes were selected and simultaneously sequenced by targeted next-generation sequencing (NGS) in 8 Korean families with autosomal dominant non-syndromic sensorineural hearing loss. Results Five mutations in known hearing loss genes, including 1 nonsense and 4 missense mutations, were identified in 5 different genes (ACTG1, MYO1F, DIAPH1, POU4F3 and EYA4), and the genotypes for these mutations were consistent with the autosomal dominant inheritance pattern of hearing loss in each family. No mutational hot-spots were revealed in these Korean families. Conclusion Targeted NGS allowed for the detection of pathogenic mutations in affected individuals who were not candidates for classical genetic studies. This report is the first documenting the effective use of an NGS technique to detect pathogenic mutations that underlie hearing loss in an East Asian population. Using this NGS technique to establish a database of common mutations in Korean patients with hearing loss and further data accumulation will contribute to the early diagnosis and fundamental therapies for hereditary hearing loss.
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Affiliation(s)
- Jeong-In Baek
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, South Korea
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30
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Baek JI, Park HJ, Park K, Choi SJ, Lee KY, Yi JH, Friedman TB, Drayna D, Shin KS, Kim UK. Pathogenic effects of a novel mutation (c.664_681del) in KCNQ4 channels associated with auditory pathology. Biochim Biophys Acta Mol Basis Dis 2010; 1812:536-43. [PMID: 20832469 DOI: 10.1016/j.bbadis.2010.09.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Revised: 08/31/2010] [Accepted: 09/02/2010] [Indexed: 01/16/2023]
Abstract
Hearing loss is a common communication disorder caused by various environmental and genetic factors. Hereditary hearing loss is very heterogeneous, and most of such cases involve sensorineural defects in the auditory pathway. There are currently 57 known autosomal dominant non-syndromic hearing loss (DFNA) loci, and the causative genes have been identified at 22 of these loci. In the present study, we performed a genome-wide linkage analysis in a Korean family segregating autosomal dominant hearing loss. We observed linkage on chromosome 1p34, and at this locus, we detected a novel mutation consisting of an 18 nucleotide deletion in exon 4 of the KCNQ4 gene, which encodes a voltage-gated potassium channel. We carried out a functional in vitro study to analyze the effects of this mutation (c.664_681del) along with two previously described KCNQ4 mutations, p.W276S and p.G285C. Although the c.664_681del mutation is located in the intercellular loop and the two previously described mutations, p.W276S and p.G285C, are located in the pore region, all mutants inhibit normal channel function by a dominant negative effect. Our analysis indicates that the intercellular loop is as significant as the pore region as a potential site of pathogenic effects on KCNQ4 channel function.
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Affiliation(s)
- Jeong-In Baek
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, 702-701, South Korea
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Sagong B, Park R, Kim YH, Lee KY, Baek JI, Cho HJ, Cho IJ, Kim UK, Lee SH. Two novel missense mutations in the TECTA gene in Korean families with autosomal dominant nonsyndromic hearing loss. Ann Clin Lab Sci 2010; 40:380-385. [PMID: 20947814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The TECTA gene, which encodes alpha-tectorin, is known as a causative gene for DFNA8/DFNA12, and DFNB21 hearing loss in humans. In the present study, mutation analysis of the TECTA gene was performed in 62 Korean patients with hereditary hearing loss. Two novel nucleotide substitutions, p.V317E and p.T1866M, were identified for the first time in the Korean population. These mutations result in the substitution of amino acids in the zonadhesin (ZA) and the zona pellucida (ZP) domains, and show a genotype-phenotype correlation, which is a characteristic of TECTA-related mutations in autosomal dominant nonsyndromic hearing loss. Both mutations are located in highly conserved regions of alpha-tectorin and were not found in 120 unrelated control subjects with normal hearing. Based on this evidence, it is likely that both mutations are the pathogenic ones causing the hearing loss. This study provides useful information for the functional study of hereditary hearing loss caused by tectorial membrane defects.
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Affiliation(s)
- Borum Sagong
- Department of Biology, Kyungpook National University, Daegu, South Korea
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Park HJ, Cho HJ, Baek JI, Ben-Yosef T, Kwon TJ, Griffith AJ, Kim UK. Evidence for a founder mutation causing DFNA5 hearing loss in East Asians. J Hum Genet 2009; 55:59-62. [PMID: 19911014 DOI: 10.1038/jhg.2009.114] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Mutations in the DFNA5 gene are known to cause autosomal dominant non-syndromic hearing loss (ADNSHL). To date, five DFNA5 mutations have been reported, all of which were different in the genomic level. In this study, we ascertained a Korean family with autosomal dominant, progressive and sensorineural hearing loss and performed linkage analysis that revealed linkage to the DFNA5 locus on chromosome 7. Sequence analysis of DFNA5 identified a 3-bp deletion in intron 7 (c.991-15_991-13del) as the cause of hearing loss in this family. As the same mutation had been reported in a large Chinese family segregating DFNA5 hearing loss, we compared their DFNA5 mutation-linked haplotype with that of the Korean family. We found a conserved haplotype, suggesting that the 3-bp deletion is derived from a single origin in these families. Our observation raises the possibility that this mutation may be a common cause of autosomal dominant progressive hearing loss in East Asians.
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Baek JI, Choi SJ, Park SH, Choi JY, Kim CD, Kim YL, Kim UK. Identification of novel variants in the COL4A4 gene in Korean patients with thin basement membrane nephropathy. Indian J Med Res 2009; 129:525-533. [PMID: 19675380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023] Open
Abstract
BACKGROUND & OBJECTIVE The alpha4 chain of the type 4 collagen family is an important component of the glomerular basement membrane (GBM) in the kidney. It is encoded by the COL4A4 gene, and mutations of this gene are known to be associated with thin basement membrane nephropathy (TBMN). To better understand the contribution of variants in the COL4A4 gene to TBMN, we investigated the sequence of the complete COL4A4 gene in 45 Korean patients with TBMN. METHODS Genomic DNA was obtained from the peripheral blood lymphocytes. For the analysis of the COL4A4 gene, all the exons including splicing sites were amplified by PCR and screened by direct sequencing analysis. RESULTS Eight novel COL4A4 sequence variants were found in these patients. Two of these variants, G199R and G1606E, were possibly pathogenic variants affecting the phenotype. None of these variants were observed in 286 chromosomes from normal Korean control subjects. In addition, 39 polymorphisms including 7 novel SNPs were identified in this study. INTERPRETATION & CONCLUSION The frequency of COL4A4 mutations in Korean patients with TBMN is low and the other cases may have mutations in other genes like COL4A3. Screening of the COL4A3 gene and finding a novel causative gene for TBMN will help clarify the pathogenesis of this disorder and perhaps for distinguishing TBMN from Alport syndrome.
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Affiliation(s)
- Jeong-In Baek
- Department of Biology, College of Natural Sciences, Kyungpook National University, Daegu, Korea
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Kim TH, Baek JI, Hong JM, Choi SJ, Lee HJ, Cho HJ, Park EK, Kim UK, Kim SY. Significant association of SREBP-2 genetic polymorphisms with avascular necrosis in the Korean population. BMC Med Genet 2008; 9:94. [PMID: 18954446 PMCID: PMC2600781 DOI: 10.1186/1471-2350-9-94] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Accepted: 10/27/2008] [Indexed: 12/03/2022]
Abstract
Background It is known that steroid usage and alcohol abuse are major etiological factors in the development of avascular necrosis (AVN), a bone disease that produces osteonecrosis of the femoral head. The facilitation of fat biosynthesis by steroids and alcohol disrupts the blood supply into the femoral head. SREBP-2 plays a central role in the maintenance of lipid homeostasis through stimulating expression of genes associated with cholesterol biosynthetic pathways. The aim of this study was to examine the association between the polymorphisms of the SREBP-2 gene and AVN susceptibility in the Korean population. Methods Four single nucleotide polymorphisms (SNP) in the SREBP-2 gene, IVS1+8408 T>C (rs2267439), IVS3-342 G>T (rs2269657), IVS11+414 G>A (rs1052717) and IVS12-1667 G>A (rs2267443), were selected from public databases and genotyped in 443 AVN patients and 273 control subjects by using single-based extension (SBE) genotyping. Results The minor allele (C) frequency of rs2267439 showed a significant protective effect on AVN (P = 0.01, OR; 0.75, 95% CI; 0.604–0.935), and the genotype frequencies of this polymorphism were also different from the controls in all alternative analysis models (P range, 0.009–0.03, OR; 0.647–0.744). In contrast, rs1052717 and rs2267443 polymorphisms were significantly associated with AVN risk. Further analysis based on pathological etiology showed that the genotypes of rs2267439, rs1052717 and rs2267443 were also significantly associated with AVN susceptibility in each subgroup. Conclusion This study is the first report to evaluate the association between SREBP-2 gene polymorphisms and the susceptibility of AVN in the Korean population.
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Affiliation(s)
- Tae-Ho Kim
- Skeletal Diseases Genome Research Center, Kyungpook National University Hospital, 44-2 Samduk 2-ga, Jung-gu, Daegu, 700-412, Republic of Korea.
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