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Nagayama S, Takahashi H, Hasegawa F, Hori A, Kizami S, Furukawa R, Horie K, Ogoyama M, Hata K, Fujiwara H. A novel variant in IFT122 associated with a severe phenotype of cranioectodermal dysplasia. Congenit Anom (Kyoto) 2024. [PMID: 38637985 DOI: 10.1111/cga.12569] [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] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 04/01/2024] [Accepted: 04/03/2024] [Indexed: 04/20/2024]
Abstract
A 27-year-old multiparous woman conceived her fetus naturally. Early second-trimester ultrasound showed short extremities with systemic subcutaneous edema. The pregnancy was artificially terminated at 19 weeks of gestation because of the abnormalities based on the parents' wishes. The parents desired whole-exome sequencing to detect a causative gene using the umbilical cord and the parents' saliva. Compound heterozygous variants (NC_000003.11(NM_052989.3):c.230 T > G/NC_000003.11(NM_052985.4):c.1178A > T) were identified. We described a fetus with a novel compound heterozygous variant in IFT122. The phenotype of this case was severer than of other types of cranioectodermal dysplasia.
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Affiliation(s)
- Shiho Nagayama
- Department of Obstetrics and Gynecology, Jichi Medical University, Shimotsuke, Japan
| | - Hironori Takahashi
- Department of Obstetrics and Gynecology, Jichi Medical University, Shimotsuke, Japan
| | - Fuyuki Hasegawa
- Department of Clinical Genetics, National Center for Child Health and Development, Tokyo, Japan
| | - Asuka Hori
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - Sho Kizami
- Department of Obstetrics and Gynecology, Jichi Medical University, Shimotsuke, Japan
| | - Rieko Furukawa
- Department of Radiology, Jichi Medical University, Shimotsuke, Japan
| | - Kenji Horie
- Department of Obstetrics and Gynecology, Jichi Medical University, Shimotsuke, Japan
| | - Manabu Ogoyama
- Department of Obstetrics and Gynecology, Jichi Medical University, Shimotsuke, Japan
| | - Kenichiro Hata
- Department of Maternal-Fetal Biology, National Research Institute for Child Health and Development, Tokyo, Japan
- Department of Molecular Biology, Gunma University, Maebashi, Japan
| | - Hiroyuki Fujiwara
- Department of Obstetrics and Gynecology, Jichi Medical University, Shimotsuke, Japan
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Yang Q, Zhang Q, Chen F, Yi S, Li M, Yi S, Xu X, Luo J. A novel combination of biallelic IFT122 variants associated with cranioectodermal dysplasia: A case report. Exp Ther Med 2021; 21:311. [PMID: 33717254 PMCID: PMC7885081 DOI: 10.3892/etm.2021.9742] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 01/13/2021] [Indexed: 12/17/2022] Open
Abstract
Cranioectodermal dysplasia (CED) or Sensenbrenner syndrome is a very rare autosomal-recessive disease that is characterized by craniofacial, skeletal and ectodermal abnormalities. The proteins encoded by six CED-associated genes are members of the intraflagelline transport (IFT) system, which serves an essential role in the assembly, maintenance and function of primary cilia. The current study identified compound novel heterozygous IFT122 (NM_052985.3) variants in a male Chinese infant with CED. The latter variant changes the length of the protein and may result in the partial loss-of-function of IFT122. With the simultaneous presence of frameshift and stop-loss variants, the patient manifested typical CED with fine and sparse hair, macrocephaly, dysmorphic facial features and upper limb phocomelia. A number of unusual phenotypic characteristics were additionally observed and included postaxial polydactyly of both hands and feet. The molecular confirmation of CED in this patient expands the CED-associated variant spectrum of IFT122 in CED, while the manifestation of CED in this patient provides additional clinical information regarding this syndrome. Moreover, the two variants identified in the proband provide a novel perspective into the phenotypes caused by different combinations of variants.
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Affiliation(s)
- Qi Yang
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
| | - Qiang Zhang
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
| | - Fei Chen
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
| | - Shang Yi
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
| | - Mengting Li
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
| | - Sheng Yi
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
| | - Xingmin Xu
- Department of Medical Genetics, Southern Medical University, Guangzhou, Guangdong 510800, P.R. China
| | - Jingsi Luo
- Department of Genetic and Metabolic Central Laboratory, Guangxi Maternal and Child Health Hospital, Nanning, Guangxi 530023, P.R. China
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Radhakrishnan U, Alsrhani A, Sundaramoorthi H, Khandekar G, Kashyap M, Fuchs JL, Perkins BD, Omori Y, Jagadeeswaran P. Intraflagellar transport proteins are involved in thrombocyte filopodia formation and secretion. Platelets 2017; 29:811-820. [PMID: 29125377 DOI: 10.1080/09537104.2017.1361524] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Intraflagellar transport (IFT) proteins are vital for the genesis and maintenance of cilia. Our identification of ift122 transcripts in zebrafish thrombocytes that lack primary cilia was unexpected. IFT proteins serve transport in cilia, whose narrow dimensions may have necessitated the evolution of IFT from vesicular transport in ancestral eukaryotes. We hypothesized that IFTs might also facilitate transport within the filopodia that form when thrombocytes are activated. To test this possibility, we knocked down ift122 expression by injecting antisense Morpholino oligonucleotides (MOs) into zebrafish embryos. Laser-induced arterial thrombosis showed prolonged time to occlusion (TTO) of the vessel, as would be expected with defective thrombocyte function. Acute effects in adult zebrafish were evaluated by Vivo-Morpholino (Vivo-MO) knockdown of ift122. Vivo-MO morphants showed a prolonged time to thrombocyte aggregation (TTA) in the plate tilt assay after thrombocyte activation by the following agonists: ADP, collagen, PAR1 peptide, and epinephrine. A luminescence assay for ATP revealed that ATP secretion by thrombocytes was reduced in collagen-activated blood of Vivo-MO ift122 morphants. Moreover, DiI-C18 labeled morphant thrombocytes exposed to collagen showed reductions in filopodia number and length. Analysis of ift mutants, in which cilia defects have been noted, also showed prolongation of TTO in our arterial laser thrombosis assay. Additionally, collagen activation of wild-type thrombocytes led to a concentration of IFT122 both within and at the base of filopodia. Taken together these results, suggest that IFT proteins are involved in both the extension of filopodia and secretion of ATP, which are critical in thrombocyte function.
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Affiliation(s)
- Uvaraj Radhakrishnan
- a Department of Biological Sciences , University of North Texas , Denton , TX, USA
| | - Abdullah Alsrhani
- a Department of Biological Sciences , University of North Texas , Denton , TX, USA
| | | | - Gauri Khandekar
- a Department of Biological Sciences , University of North Texas , Denton , TX, USA
| | - Meghana Kashyap
- a Department of Biological Sciences , University of North Texas , Denton , TX, USA
| | - Jannon L Fuchs
- a Department of Biological Sciences , University of North Texas , Denton , TX, USA
| | - Brian D Perkins
- b Department of Ophthalmic Research , Cole Eye Institute, Cleveland Clinic , Cleveland , OH, USA
| | - Yoshihiro Omori
- c Laboratory for Molecular and Developmental Biology, Institute for Protein Research, Osaka University , Osaka , Japan
| | - Pudur Jagadeeswaran
- a Department of Biological Sciences , University of North Texas , Denton , TX, USA
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Xu Y, Sun S, Li N, Yu T, Wang X, Wang J, Bao N. Identification and analysis of the genetic causes in nine unrelated probands with syndromic craniosynostosis. Gene 2017; 641:144-150. [PMID: 29037998 DOI: 10.1016/j.gene.2017.10.041] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 09/29/2017] [Accepted: 10/12/2017] [Indexed: 12/31/2022]
Abstract
Syndromic craniosynostosis is a group of multiple conditions with high heterogeneity, and many rare syndromes still remain to be characterized. To identify and analyze causative genetic variants in nine unrelated probands mainly manifested as syndromic craniosynostosis, we reviewed the relevant medical information of the patients and performed the whole exome sequencing, further verified with Sanger sequencing and parental background. Bioinformatics analysis was used to evaluate the potential deleterious or benign effect of each genetic variant through evolutionary conservation alignment, multi-lines of computer predication and the allele frequency in population dataset (control and patient). The Standards and guidelines from American College of Medical Genetics and Genomics was used to classify and interpret the pathogenicity for each genetic variant. All the nine probands were found to carry the possibly causative variants, among which three variants including two missense mutations (c.3385C>T in IFT122 gene, c.3581A>G in SMC1A gene) and a frameshift mutation (c.434dupA in TWIST1 gene) have never been reported in patients before. We suggested Cornelia de Lange syndrome caused by SMC1A variant is a neglected syndromic craniosynostosis. Our study not only expanded genotypic and phenotypic spectrum of the rare syndromes, but also confirmed that there existed an underlying genetic mechanism. We emphasized that deliberate selection of both the potential candidates and comprehensive detection methods for genetic analysis is important to increase the genetic diagnosis yield of syndromic craninosynostosis.
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Affiliation(s)
- Yufei Xu
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Institute of Pediatric Translational Medicine, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Shouqing Sun
- Department of Neurosurgery, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Niu Li
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Institute of Pediatric Translational Medicine, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Tingting Yu
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Institute of Pediatric Translational Medicine, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Xiumin Wang
- Department of Endocrinology and Metabolism, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Jian Wang
- Department of Medical Genetics and Molecular Diagnostic Laboratory, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Institute of Pediatric Translational Medicine, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China.
| | - Nan Bao
- Department of Neurosurgery, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China.
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Burnett JB, Lupu FI, Eggenschwiler JT. Proper ciliary assembly is critical for restricting Hedgehog signaling during early eye development in mice. Dev Biol 2017; 430:32-40. [PMID: 28778798 DOI: 10.1016/j.ydbio.2017.07.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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: 05/10/2017] [Revised: 07/20/2017] [Accepted: 07/20/2017] [Indexed: 11/25/2022]
Abstract
Patterning of the vertebrate eye into optic stalk, retinal pigment epithelium (RPE) and neural retina (NR) territories relies on a number of signaling pathways, but how these signals are interpreted by optic progenitors is not well understood. The primary cilium is a microtubule-based organelle that is essential for Hedgehog (Hh) signaling, but it has also been implicated in the regulation of other signaling pathways. Here, we show that the optic primordium is ciliated during early eye development and that ciliogenesis is essential for proper patterning and morphogenesis of the mouse eye. Ift172 mutants fail to generate primary cilia and exhibit patterning defects that resemble those of Gli3 mutants, suggesting that cilia are required to restrict Hh activity during eye formation. Ift122 mutants, which produce cilia with abnormal morphology, generate optic vesicles that fail to invaginate to produce the optic cup. These mutants also lack formation of the lens, RPE and NR. Such phenotypic features are accompanied by strong, ectopic Hh pathway activity, evidenced by altered gene expression patterns. Removal of GLI2 from Ift122 mutants rescued several aspects of optic cup and lens morphogenesis as well as RPE and NR specification. Collectively, our data suggest that proper assembly of primary cilia is critical for restricting the Hedgehog pathway during eye formation in the mouse.
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Affiliation(s)
- Jacob B Burnett
- Department of Genetics, University of Georgia, Athens, GA 30602, United States
| | - Floria I Lupu
- Department of Genetics, University of Georgia, Athens, GA 30602, United States
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Silveira KC, Moreno CA, Cavalcanti DP. Beemer-Langer syndrome is a ciliopathy due to biallelic mutations in IFT122. Am J Med Genet A 2017; 173:1186-1189. [PMID: 28370949 DOI: 10.1002/ajmg.a.38157] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [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: 09/29/2016] [Revised: 11/10/2016] [Accepted: 01/08/2017] [Indexed: 11/09/2022]
Abstract
Since most short-rib polydactyly phenotypes are due to genes involved with biogenesis and maintenance of the primary cilium, this group of skeletal dysplasias was recently designated as ciliopathies with major skeletal involvement. Beemer-Langer syndrome or short-rib polydactyly type IV, was first described in 1983, and has, thus far, remained without a defined molecular basis. The most recent classification of the skeletal dysplasias referred to this phenotype as an as-yet unproven ciliopathy. IFT122 is a gene that encodes a protein responsible for the retrograde transport along the cilium; it has been associated with this group of skeletal dysplasias. To date, mutations in this gene were only found in Sensenbrenner syndrome. Using a panel of skeletal dysplasias genes, including 11 related to SRP, we identified biallelic mutations in IFT122 ([c.3184G>C];[c.3228dupG;c.3231_3233delCAT]) in a fetus with a typical phenotype of SRP-IV, finally confirmed that this phenotype is a ciliopathy and adding to the list of ciliopathies with major skeletal involvement.
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Affiliation(s)
- Karina C Silveira
- Department of Medical Genetics, Skeletal Dysplasia Group, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Carolina A Moreno
- Department of Medical Genetics, Skeletal Dysplasia Group, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.,Department of Medical Genetics, Perinatal Genetic Program, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Denise P Cavalcanti
- Department of Medical Genetics, Skeletal Dysplasia Group, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.,Department of Medical Genetics, Perinatal Genetic Program, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
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Moosa S, Obregon MG, Altmüller J, Thiele H, Nürnberg P, Fano V, Wollnik B. Novel IFT122 mutations in three Argentinian patients with cranioectodermal dysplasia: Expanding the mutational spectrum. Am J Med Genet A 2016; 170A:1295-301. [PMID: 26792575 DOI: 10.1002/ajmg.a.37570] [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: 11/13/2015] [Accepted: 01/08/2016] [Indexed: 11/09/2022]
Abstract
Cranioectodermal dysplasia (CED), also known as Sensenbrenner syndrome, is an autosomal recessive ciliary chondrodysplasia characterized by a recognizable craniofacial gestalt, skeletal abnormalities, and ectodermal features. To date, four genes have been shown to underlie the syndrome, namely, IFT122 (WDR10), WDR35 (IFT121), IFT43 (C14orf179), and WDR19 (IFT144). Clinical characterization of a larger cohort of patients with CED has been undertaken previously. Nevertheless, there are too few molecularly confirmed patients reported in the literature to determine precise genotype-phenotype correlations. To date, biallelic IFT122 mutations have been described in only five families. We therefore studied three unrelated Argentinian patients with typical features of CED using a 4813 next-generation sequencing (NGS) gene panel, which we call the "Mendeliome." The three patients had different, novel, compound heterozygous mutations in IFT122. Consequently, we compared these three patients to those previously described with IFT122 mutations. Thus, our report serves to add 6 novel mutations to the IFT122 mutation spectrum and to contribute to the IFT122-related clinical characterization.
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Affiliation(s)
- Shahida Moosa
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany.,Institute of Human Genetics, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
| | | | - Janine Altmüller
- Institute of Human Genetics, University of Cologne, Cologne, Germany.,Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Holger Thiele
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Peter Nürnberg
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany.,Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany.,Cologne Excellence Cluster on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Virginia Fano
- Department of Growth and Development, Garrahan Pediatrics Hospital, Buenos Aires, Argentina
| | - Bernd Wollnik
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany.,Institute of Human Genetics, University of Cologne, Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
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