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Chen L, Yang C, Zhang X, Chen B, Zheng P, Li T, Song W, Gao H, Yue X, Yang J. STX16 exon 5-7 deletion in a patient with pseudohypoparathyroidism type 1B. J Pediatr Endocrinol Metab 2024; 37:734-740. [PMID: 39026465 DOI: 10.1515/jpem-2023-0562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 07/07/2024] [Indexed: 07/20/2024]
Abstract
OBJECTIVES Pseudohypoparathyroidism (PHP) comprises a cluster of heterogeneous diseases characterized by hypocalcemia and hyperphosphatemia due to parathyroid hormone (PTH) resistance. PHP type 1B (PHP1B) is caused by heterozygous maternal deletions within GNAS or STX16. STX16 exon 2-6 deletion is commonly observed in autosomal dominant (AD)-PHP1B, while sporadic PHP1B commonly results from methylation abnormalities of maternal differentially methylated regions and remains unclear at the molecular level. CASE PRESENTATION A 39-year-old male patient with PHP1B, who had his first seizure at 15 years of age, presented to our hospital. The methylation-specific multiplex ligation-dependent probe amplification results showed a half-reduced copy number of STX16 exon 5-7 and loss of methylation at GNAS exon A/B. His mother also had a half-reduced copy number of STX16 exon 5-7 but with normal methylation of GNAS. His father has a normal copy number of STX16 and normal methylation of GNAS. CONCLUSIONS For the recognition and early diagnosis of this kind of disease, here we report the clinical symptoms, auxiliary examinations, genetic testing characteristics, and treatment of the patient.
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Affiliation(s)
- Li Chen
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Chuanbin Yang
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Xiaoxiao Zhang
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Beibei Chen
- Department of Endocrinology, The First Affiliated Hospital of Henan University, Henan Province, China
| | - Peibing Zheng
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Tingting Li
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Wenjing Song
- Department of Endocrinology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hua Gao
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Xiaofang Yue
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
| | - Jiajun Yang
- Department of Neurology, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Neurological Rare Disease Biobank and Precision Diagnostic Technical Service Platform, Shanghai, China
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2
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da Silva Siqueira L, Rodrigues FVF, Zanatta Â, Gonçalves JIB, Ghilardi IM, Alcará AM, Becker NB, Pinzetta G, Zanirati G, Becker BMA, Erwig HS, da Costa JC, Marinowic DR. Evaluation of the effects of the Zika Virus-Immunoglobulin G + complex on murine microglial cells. J Neurovirol 2024:10.1007/s13365-024-01218-7. [PMID: 38935226 DOI: 10.1007/s13365-024-01218-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 06/04/2024] [Accepted: 06/07/2024] [Indexed: 06/28/2024]
Abstract
After the Zika virus (ZIKV) epidemic in Brazil, ZIKV infections were linked to damage to the central nervous system (CNS) and congenital anomalies. Due to the virus's ability to cross the placenta and reach brain tissue, its effects become severe, leading to Congenital Zika Syndrome (CZS) and resulting in neuroinflammation, microglial activation, and secretion of neurotoxic factors. The presence of ZIKV triggers an inadequate fetal immune response, as the fetus only has the protection of maternal antibodies of the Immunoglobulin G (IgG) class, which are the only antibodies capable of crossing the placenta. Because of limited understanding regarding the long term consequences of ZIKV infection and the involvement of maternal antibodies, this study sought to assess the impact of the ZIKV + IgG⁺complex on murine microglial cells. The cells were exposed to ZIKV, IgG antibodies, and the ZIKV + IgG⁺complex for 24 and 72 h. Treatment-induced cytotoxic effects were evaluated using the cell viability assay, oxidative stress, and mitochondrial membrane potential. The findings indicated that IgG antibodies exhibit cytotoxic effects on microglia, whether alone or in the presence of ZIKV, leading to compromised cell viability, disrupted mitochondrial membrane potential, and heightened oxidative damage. Our conclusion is that IgG antibodies exert detrimental effects on microglia, triggering their activation and potentially disrupting the creation of a neurotoxic environment. Moreover, the presence of antibodies may correlate with an elevated risk of ZIKV-induced neuroinflammation, contributing to long-term CNS damage.
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Affiliation(s)
- Laura da Silva Siqueira
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - Felipe Valle Fortes Rodrigues
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - Ângela Zanatta
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - João Ismael Budelon Gonçalves
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
| | - Isadora Machado Ghilardi
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - Allan Marinho Alcará
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - Nicole Bernd Becker
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
| | - Giulia Pinzetta
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
| | - Gabriele Zanirati
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - Bruno Maestri Abrianos Becker
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
| | - Helena Scartassini Erwig
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
| | - Jaderson Costa da Costa
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil
| | - Daniel Rodrigo Marinowic
- Brain Institute of Rio Grande do Sul (BraIns), Pontifical Catholic University of Rio Grande do Sul (PUCRS), Av. Ipiranga 6690, Porto Alegre, 90610-000, RS, Brazil.
- School of Medicine, Graduate Program in Pediatrics and Child Health, Pontifical Catholic University of Rio Grande do Sul (PUCRS), Porto Alegre, 90610-000, RS, Brazil.
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3
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Li Q, Peng G, Liu H, Wang L, Lu R, Li L. Molecular mechanisms of secretory autophagy and its potential role in diseases. Life Sci 2024; 347:122653. [PMID: 38663839 DOI: 10.1016/j.lfs.2024.122653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 04/17/2024] [Indexed: 04/29/2024]
Abstract
Autophagy is a cellular degradation system that recycles or degrades damaged organelles, viral particles, and aggregated proteins through the lysosomal pathway. Autophagy plays an indispensable role in cellular homeostasis and communication processes. An interesting aspect is that autophagy also mediates the secretion of cellular contents, a process known as secretory autophagy. Secretory autophagy differs from macroautophagy, which sequesters recruited proteins, organelles, or viral particles into autophagosomes and degrades these sequesters in lysosomes, while the secretory autophagy pathway participates in the extracellular export of cellular contents sequestered by autophagosomes through autophagy and endosomal modulators. Recent evidence reveals that secretory autophagy is pivotal in the occurrence and progression of diseases. In this review, we summarize the molecular mechanisms of secretory autophagy. Furthermore, we review the impact of secretory autophagy on diseases, including cancer, viral infectious diseases, neurodegenerative diseases, and cardiovascular diseases. Considering the pleiotropic actions of secretory autophagy on diseases, studying the mechanism of secretory autophagy may help to understand the relevant pathophysiological processes.
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Affiliation(s)
- Qin Li
- Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China
| | - Guolong Peng
- Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China
| | - Huimei Liu
- Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China
| | - Liwen Wang
- Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China
| | - Ruirui Lu
- Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China.
| | - Lanfang Li
- Institute of Pharmacy and Pharmacology, University of South China, Hengyang 421001, Hunan, China.
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4
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Ali NH, Al-Kuraishy HM, Al-Gareeb AI, Alnaaim SA, Hetta HF, Saad HM, Batiha GES. A Mutual Nexus Between Epilepsy and α-Synuclein: A Puzzle Pathway. Mol Neurobiol 2024:10.1007/s12035-024-04204-6. [PMID: 38703341 DOI: 10.1007/s12035-024-04204-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Accepted: 04/12/2024] [Indexed: 05/06/2024]
Abstract
Alpha-synuclein (α-Syn) is a specific neuronal protein that regulates neurotransmitter release and trafficking of synaptic vesicles. Exosome-associated α-Syn which is specific to the central nervous system (CNS) is involved in the pathogenesis of epilepsy. Therefore, this review aimed to elucidate the possible link between α-Syn and epilepsy, and how it affects the pathophysiology of epilepsy. A neurodegenerative protein such as α-Syn is implicated in the pathogenesis of epilepsy. Evidence from preclinical and clinical studies revealed that upregulation of α-Syn induces progressive neuronal dysfunctions through induction of oxidative stress, neuroinflammation, and inhibition of autophagy in a vicious cycle with subsequent development of severe epilepsy. In addition, accumulation of α-Syn in epilepsy could be secondary to the different cellular alterations including oxidative stress, neuroinflammation, reduction of brain-derived neurotrophic factor (BDNF) and progranulin (PGN), and failure of the autophagy pathway. However, the mechanism of α-Syn-induced-epileptogenesis is not well elucidated. Therefore, α-Syn could be a secondary consequence of epilepsy. Preclinical and clinical studies are warranted to confirm this causal relationship.
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Affiliation(s)
- Naif H Ali
- Department of Internal Medicine, Medical College, Najran University, Najran, Kingdom of Saudi Arabia
| | - Hayder M Al-Kuraishy
- Department of Clinical Pharmacology and Medicine, College of Medicine, Mustansiriyah University, M.B.Ch.B, FRCP, P.O. Box 14132, Baghdad, Iraq
| | - Ali I Al-Gareeb
- Jabir Ibn Hayyan Medical University, Al-Ameer Qu, P.O. Box 13, Kufa, Najaf, Iraq
| | - Saud A Alnaaim
- Clinical Neurosciences Department, College of Medicine, King Faisal University, Hofuf, Saudi Arabia
| | - Helal F Hetta
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, 71515, Egypt
| | - Hebatallah M Saad
- Department of Pathology, Faculty of Veterinary Medicine, Matrouh University, Matrouh, 51744, Egypt.
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, 22511, AlBeheira, Egypt.
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5
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Vetri L, Calì F, Saccone S, Vinci M, Chiavetta NV, Carotenuto M, Roccella M, Costanza C, Elia M. Whole Exome Sequencing as a First-Line Molecular Genetic Test in Developmental and Epileptic Encephalopathies. Int J Mol Sci 2024; 25:1146. [PMID: 38256219 PMCID: PMC10816140 DOI: 10.3390/ijms25021146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/11/2024] [Accepted: 01/13/2024] [Indexed: 01/24/2024] Open
Abstract
Developmental and epileptic encephalopathies (DEE) are severe neurodevelopmental disorders characterized by recurrent, usually early-onset, epileptic seizures accompanied by developmental impairment often related to both underlying genetic etiology and abnormal epileptiform activity. Today, next-generation sequencing technologies (NGS) allow us to sequence large portions of DNA quickly and with low costs. The aim of this study is to evaluate the use of whole-exome sequencing (WES) as a first-line molecular genetic test in a sample of subjects with DEEs characterized by early-onset drug-resistant epilepsies, associated with global developmental delay and/or intellectual disability (ID). We performed 82 WESs, identifying 35 pathogenic variants with a detection rate of 43%. The identified variants were highlighted on 29 different genes including, 3 new candidate genes (KCNC2, STXBP6, DHRS9) for DEEs never identified before. In total, 23 out of 35 (66%) de novo variants were identified. The most frequently identified type of inheritance was autosomal dominant de novo (60%) followed by autosomal recessive in homozygosity (17%) and heterozygosity (11%), autosomal dominant inherited from parental mosaicism (6%) and X-linked dominant de novo (6%). The most frequent mutations identified were missense (75%) followed by frameshift deletions (16%), frameshift duplications (5%), and splicing mutations (3%). Considering the results obtained in the present study we support the use of WES as a form of first-line molecular genetic testing in DEEs.
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Affiliation(s)
- Luigi Vetri
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (L.V.); (M.V.); (N.V.C.); (M.E.)
| | - Francesco Calì
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (L.V.); (M.V.); (N.V.C.); (M.E.)
| | - Salvatore Saccone
- Department Biological, Geological and Environmental Sciences, University of Catania, Via Androne 81, 95124 Catania, Italy
| | - Mirella Vinci
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (L.V.); (M.V.); (N.V.C.); (M.E.)
| | | | - Marco Carotenuto
- Clinic of Child and Adolescent Neuropsychiatry, Department of Mental Health, Physical and Preventive Medicine, University of Campania “Luigi Vanvitelli”, 80131 Naples, Italy;
| | - Michele Roccella
- Department of Psychology, Educational Science and Human Movement, University of Palermo, 90141 Palermo, Italy; (M.R.); (C.C.)
| | - Carola Costanza
- Department of Psychology, Educational Science and Human Movement, University of Palermo, 90141 Palermo, Italy; (M.R.); (C.C.)
| | - Maurizio Elia
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (L.V.); (M.V.); (N.V.C.); (M.E.)
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6
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Baris RO, Sahin N, Bilgic AD, Ozdemir C, Edgunlu TG. Molecular and in silico analyses of SYN III gene variants in autism spectrum disorder. Ir J Med Sci 2023; 192:2887-2895. [PMID: 37166614 DOI: 10.1007/s11845-023-03402-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 05/04/2023] [Indexed: 05/12/2023]
Abstract
BACKGROUND Defects in neurotransmission and synaptogenesis are noteworthy in the pathogenesis of ASD. Synapsin III (SYN III) is defined as a synaptic vesicle protein that plays an important role in synaptogenesis and regulation of neurotransmitter release and neurite outgrowth. Therefore, SYN III may associate with many neurodevelopmental diseases, including ASD. AIM The aim of this study was to investigate whether the SYN III gene -631 C > G (rs133946) and -196 G > A (rs133945) polymorphisms are associated with susceptibility to ASD. METHODS SYN III variants and the risk of ASD were investigated in 26 healthy children and 24 ASD children. SYN III gene variants were genotyped by PCR-RFLP methods. The differences in genotype and allele frequencies between the ASD and control groups were calculated using the chi-square (χ2). We analysed the SYN III gene using web-based tools. RESULTS Our results suggest that the presence of the AA genotype of the SYN III -196 G > A (rs133945) polymorphism affects the characteristics and development of ASD in children (p = 0.012). SYN III -631 C > G (rs133946) polymorphism was not associated with ASD (p = 0.524). We have shown the prediction of gene-gene interaction that SYN III is co-expressed with 17 genes, physical interaction with 3 genes, and co-localization with 12 genes. The importance of different genes (SYN I, II, III, GABRD, NOS1AP, GNAO1) for ASD pathogenesis was revealed by GO analysis. CONCLUSION Considering the role of SYN III and related genes, especially in the synaptic vesicle pathway and neurotransmission, its effect on ASD can be further investigated.
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Affiliation(s)
- Remzi Oguz Baris
- Faculty of Medicine, Mugla Sitki Kocman University, Mugla, Turkey
| | - Nilfer Sahin
- Department of Child and Adolescent Mental Health Diseases School of Medicine, Muğla Sıtkı Koçman University, Mugla, Turkey
| | - Ayşegül Demirtas Bilgic
- Department of Medical Biology, Health Sciences Institution, Muğla Sıtkı Koçman University, Mugla, Turkey
| | - Cilem Ozdemir
- Department of Medical Biology, Health Sciences Institution, Muğla Sıtkı Koçman University, Mugla, Turkey.
| | - Tuba Gokdogan Edgunlu
- Department of Medical Biology, School of Medicine, Muğla Sıtkı Koçman University, Mugla, 48000, Turkey
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7
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Vinci M, Costanza C, Galati Rando R, Treccarichi S, Saccone S, Carotenuto M, Roccella M, Calì F, Elia M, Vetri L. STXBP6 Gene Mutation: A New Form of SNAREopathy Leads to Developmental Epileptic Encephalopathy. Int J Mol Sci 2023; 24:16436. [PMID: 38003627 PMCID: PMC10670990 DOI: 10.3390/ijms242216436] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/13/2023] [Accepted: 11/15/2023] [Indexed: 11/26/2023] Open
Abstract
Syntaxin-binding protein 6 (STXBP6), also known as amysin, is an essential component of the SNAP receptor (SNARE) complex and plays a crucial role in neuronal vesicle trafficking. Mutations in genes encoding SNARE proteins are often associated with a broad spectrum of neurological conditions defined as "SNAREopathies", including epilepsy, intellectual disability, and neurodevelopmental disorders such as autism spectrum disorders. The present whole exome sequencing (WES) study describes, for the first time, the occurrence of developmental epileptic encephalopathy and autism spectrum disorders as a result of a de novo deletion within the STXBP6 gene. The truncated protein in the STXBP6 gene leading to a premature stop codon could negatively modulate the synaptic vesicles' exocytosis. Our research aimed to elucidate a plausible, robust correlation between STXBP6 gene deletion and the manifestation of developmental epileptic encephalopathy.
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Affiliation(s)
- Mirella Vinci
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (M.V.); (R.G.R.); (S.T.); (M.E.); (L.V.)
| | - Carola Costanza
- Department of Psychology, Educational Science and Human Movement, University of Palermo, 90141 Palermo, Italy; (C.C.); (M.R.)
| | - Rosanna Galati Rando
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (M.V.); (R.G.R.); (S.T.); (M.E.); (L.V.)
| | - Simone Treccarichi
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (M.V.); (R.G.R.); (S.T.); (M.E.); (L.V.)
| | - Salvatore Saccone
- Department Biological, Geological and Environmental Sciences, University of Catania, Via Androne 81, 95124 Catania, Italy;
| | - Marco Carotenuto
- Clinic of Child and Adolescent Neuropsychiatry, Department of Mental Health, Physical and Preventive Medicine, University of Campania “Luigi Vanvitelli”, 80131 Naples, Italy;
| | - Michele Roccella
- Department of Psychology, Educational Science and Human Movement, University of Palermo, 90141 Palermo, Italy; (C.C.); (M.R.)
| | - Francesco Calì
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (M.V.); (R.G.R.); (S.T.); (M.E.); (L.V.)
| | - Maurizio Elia
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (M.V.); (R.G.R.); (S.T.); (M.E.); (L.V.)
| | - Luigi Vetri
- Oasi Research Institute-IRCCS, 94018 Troina, Italy; (M.V.); (R.G.R.); (S.T.); (M.E.); (L.V.)
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8
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Nordenskjöld A, Arkani S, Pettersson M, Winberg J, Cao J, Fossum M, Anderberg M, Barker G, Holmdahl G, Lundin J. Copy number variants suggest different molecular pathways for the pathogenesis of bladder exstrophy. Am J Med Genet A 2023; 191:378-390. [PMID: 36349425 PMCID: PMC10100507 DOI: 10.1002/ajmg.a.63031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 08/05/2022] [Accepted: 10/07/2022] [Indexed: 11/10/2022]
Abstract
Bladder exstrophy is a rare congenital malformation leaving the urinary bladder open in the midline of the abdomen at birth. There is a clear genetic background with chromosome aberrations, but so far, no consistent findings apart from 22q11-duplications detected in about 2%-3% of all patients. Some genes are implicated like the LZTR1, ISL1, CELSR3, and the WNT3 genes, but most are not explained molecularly. We have performed chromosomal microarray analysis on a cohort of 140 persons born with bladder exstrophy to look for submicroscopic chromosomal deletions and duplications. Pathogenic or possibly pathogenic microdeletions or duplications were found in 16 patients (11.4%) and further 9 with unknown significance. Two findings were in regions linked to known syndromes, two findings involved the same gene (MCC), and all other findings were unique. A closer analysis suggests a few gene networks that are involved in the pathogenesis of bladder exstrophy; the WNT-signaling pathway, the chromosome 22q11 region, the RIT2 and POU families, and involvement of the Golgi apparatus. Bladder exstrophy is a rare malformation and is reported to be associated with several chromosome aberrations. Our data suggest involvement of some specific molecular pathways.
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Affiliation(s)
- Agneta Nordenskjöld
- Department of Women's and Children's Health, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.,Pediatric Surgery, Astrid Lindgren Children Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - Samara Arkani
- Department of Women's and Children's Health, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.,Department of Urology, Danderyds Hospital, Danderyd, Sweden
| | - Maria Pettersson
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden.,Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Johanna Winberg
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden.,Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Jia Cao
- Department of Women's and Children's Health, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Magdalena Fossum
- Department of Women's and Children's Health, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.,Department of Pediatric Surgery, Copenhagen University, Righospitalet, København, Denmark
| | - Magnus Anderberg
- Department of Pediatric Surgery, Skåne University Hospital, Lund, Sweden.,Department of Clinical Sciences, Lund University, Lund, Sweden
| | - Gillian Barker
- Department of Pediatric Surgery, Uppsala Academic Hospital, Uppsala, Sweden
| | - Gundela Holmdahl
- Department of Women's and Children's Health, and Center for Molecular Medicine, Karolinska Institutet, Stockholm, Sweden.,Pediatric Surgery, Astrid Lindgren Children Hospital, Karolinska University Hospital, Stockholm, Sweden.,Sahlgrenska Academy, Women's and Children's Health, Gothenburg, Sweden.,Department of Pediatric Surgery, Queen Silvia's Children's Hospital, Gothenburg, Sweden
| | - Johanna Lundin
- Department of Clinical Genetics, Karolinska University Hospital, Stockholm, Sweden.,Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
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9
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Agostini S, Bolognesi E, Mancuso R, Marventano I, Citterio LA, Guerini FR, Clerici M. miR-23a-3p and miR-181a-5p modulate SNAP-25 expression. PLoS One 2023; 18:e0279961. [PMID: 36649268 PMCID: PMC9844927 DOI: 10.1371/journal.pone.0279961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 12/14/2022] [Indexed: 01/18/2023] Open
Abstract
SNAP-25 protein is a key protein of the SNARE complex that is involved in synaptic vesicles fusion with plasma membranes and neurotransmitter release, playing a fundamental role in neural plasticity. Recently the concentration of three specific miRNAs-miR-27b-3p, miR-181a-5p and miR-23a-3p -was found to be associated with a specific SNAP-25 polymorphism (rs363050). in silico analysis showed that all the three miRNAs target SNAP-25, but the effect of the interaction between these miRNAs and the 3'UTR of SNAP-25 mRNA is currently unknown. For this reason, we verified in vitro whether miR-27b-3p, miR-181a-5p and miR-23a-3p modulate SNAP-25 gene and protein expression. Initial experiments using miRNAs-co-transfected Vero cells and SNAP-25 3'UTR luciferase reporter plasmids showed that miR-181a-5p (p≤0.01) and miR-23a-3p (p<0.05), but not miR-27b-3p, modulate the luciferase signal, indicating that these two miRNAs bind the SNAP-25 3'UTR. Results obtained using human oligodendroglial cell line (MO3.13) transfected with miR-181a-5p or miR-27b-3p confirmed that miR-181a-5p and miR-23a-3p regulate SNAP-25 gene and protein expression. Interestingly, the two miRNAs modulate in an opposite way SNAP-25, as miR-181a-5p significantly increases (p<0.0005), whereas miR-23a-3p decreases (p<0.0005) its expression. These results for the first time describe the ability of miR-181a-5p and miR-23a-3p to modulate SNAP-25 expression, suggesting their possible use as biomarkers or as therapeutical targets for diseases in which SNAP-25 expression is altered.
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Affiliation(s)
| | | | - Roberta Mancuso
- IRCCS Fondazione Don Carlo Gnocchi ONLUS, Milan, Italy
- * E-mail:
| | | | | | | | - Mario Clerici
- IRCCS Fondazione Don Carlo Gnocchi ONLUS, Milan, Italy
- Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy
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10
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Reynolds HM, Wen T, Farrell A, Mao R, Moore B, Boyden SE, Bayrak-Toydemir P, Nicholas TJ, Rynearson S, Holt C, Miller C, Noble K, Bentley D, Palmquist R, Ostrander B, Manberg S, Bonkowsky JL, Shayota BJ, Jenkins SM. Rapid genome sequencing identifies a novel de novo SNAP25 variant for neonatal congenital myasthenic syndrome. Cold Spring Harb Mol Case Stud 2022; 8:a006242. [PMID: 36379720 PMCID: PMC9808558 DOI: 10.1101/mcs.a006242] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 11/10/2022] [Indexed: 11/16/2022] Open
Abstract
Congenital myasthenic syndrome (CMS) is a group of 32 disorders involving genetic dysfunction at the neuromuscular junction resulting in skeletal muscle weakness that worsens with physical activity. Precise diagnosis and molecular subtype identification are critical for treatment as medication for one subtype may exacerbate disease in another (Engel et al., Lancet Neurol 14: 420 [2015]; Finsterer, Orphanet J Rare Dis 14: 57 [2019]; Prior and Ghosh, J Child Neurol 36: 610 [2021]). The SNAP25-related CMS subtype (congenital myasthenic syndrome 18, CMS18; MIM #616330) is a rare disorder characterized by muscle fatigability, delayed psychomotor development, and ataxia. Herein, we performed rapid whole-genome sequencing (rWGS) on a critically ill newborn leading to the discovery of an unreported pathogenic de novo SNAP25 c.529C > T; p.Gln177Ter variant. In this report, we present a novel case of CMS18 with complex neonatal consequence. This discovery offers unique insight into the extent of phenotypic severity in CMS18, expands the reported SNAP25 variant phenotype, and paves a foundation for personalized management for CMS18.
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Affiliation(s)
- Hayley M Reynolds
- University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
| | - Ting Wen
- University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
- ARUP Laboratories, Salt Lake City, Utah 84108, USA
| | - Andrew Farrell
- Department of Human Genetics, Utah Center for Genetic Discovery, Salt Lake City, Utah 84112, USA
| | - Rong Mao
- University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
- ARUP Laboratories, Salt Lake City, Utah 84108, USA
| | - Barry Moore
- Department of Human Genetics, Utah Center for Genetic Discovery, Salt Lake City, Utah 84112, USA
| | - Steven E Boyden
- Department of Human Genetics, Utah Center for Genetic Discovery, Salt Lake City, Utah 84112, USA
| | - Pinar Bayrak-Toydemir
- University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
- ARUP Laboratories, Salt Lake City, Utah 84108, USA
| | - Thomas J Nicholas
- Department of Human Genetics, Utah Center for Genetic Discovery, Salt Lake City, Utah 84112, USA
| | - Shawn Rynearson
- Department of Human Genetics, Utah Center for Genetic Discovery, Salt Lake City, Utah 84112, USA
| | - Carson Holt
- Department of Human Genetics, Utah Center for Genetic Discovery, Salt Lake City, Utah 84112, USA
| | | | | | - Dawn Bentley
- Division of Neonatology, Department of Pediatrics University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
| | - Rachel Palmquist
- Division of Pediatric Neurology, Department of Pediatrics University of Utah School of Medicine, Salt Lake City, Utah 84113, USA
| | - Betsy Ostrander
- Division of Pediatric Neurology, Department of Pediatrics University of Utah School of Medicine, Salt Lake City, Utah 84113, USA
| | - Stephanie Manberg
- Division of Pediatric Neurology, Department of Pediatrics University of Utah School of Medicine, Salt Lake City, Utah 84113, USA
| | - Joshua L Bonkowsky
- Division of Pediatric Neurology, Department of Pediatrics University of Utah School of Medicine, Salt Lake City, Utah 84113, USA
- Center for Personalized Medicine, Primary Children's Hospital, Salt Lake City, Utah 84108, USA
| | - Brian J Shayota
- Division of Medical Genetics, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
| | - Sabrina Malone Jenkins
- Division of Neonatology, Department of Pediatrics University of Utah School of Medicine, Salt Lake City, Utah 84112, USA
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11
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Khvotchev M, Soloviev M. SNARE Modulators and SNARE Mimetic Peptides. Biomolecules 2022; 12:biom12121779. [PMID: 36551207 PMCID: PMC9776023 DOI: 10.3390/biom12121779] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 11/22/2022] [Accepted: 11/26/2022] [Indexed: 12/03/2022] Open
Abstract
The soluble N-ethylmaleimide-sensitive factor (NSF) attachment protein (SNAP) receptor (SNARE) proteins play a central role in most forms of intracellular membrane trafficking, a key process that allows for membrane and biocargo shuffling between multiple compartments within the cell and extracellular environment. The structural organization of SNARE proteins is relatively simple, with several intrinsically disordered and folded elements (e.g., SNARE motif, N-terminal domain, transmembrane region) that interact with other SNAREs, SNARE-regulating proteins and biological membranes. In this review, we discuss recent advances in the development of functional peptides that can modify SNARE-binding interfaces and modulate SNARE function. The ability of the relatively short SNARE motif to assemble spontaneously into stable coiled coil tetrahelical bundles has inspired the development of reduced SNARE-mimetic systems that use peptides for biological membrane fusion and for making large supramolecular protein complexes. We evaluate two such systems, based on peptide-nucleic acids (PNAs) and coiled coil peptides. We also review how the self-assembly of SNARE motifs can be exploited to drive on-demand assembly of complex re-engineered polypeptides.
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Affiliation(s)
- Mikhail Khvotchev
- Department of Biochemistry, Center for Neuroscience, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
- Correspondence: (M.K.); (M.S.)
| | - Mikhail Soloviev
- Department of Biological Sciences, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK
- Correspondence: (M.K.); (M.S.)
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12
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Fan S, Liu H, Li L. The REEP family of proteins: molecular targets and role in pathophysiology. Pharmacol Res 2022; 185:106477. [PMID: 36191880 DOI: 10.1016/j.phrs.2022.106477] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 11/18/2022]
Abstract
Receptor expression-enhancing proteins (REEPs) are an evolutionarily conserved protein family that is pivotal to the structure and function of the endoplasmic reticulum (ER). The REEP family can be classified into two major subfamilies in higher species, the REEP1-4 and REEP5-6 subfamilies. Within the REEP1-4 subfamily, REEP1 and REEP2 are closely related, and REEP3 and REEP4 are similarly related. The REEP family is widely distributed in various tissues. Recent studies indicate that the REEP family is involved in many pathological and physiological processes, such as ER morphogenesis and remodeling, microtubule cytoskeleton regulation, and the trafficking and expression of G protein-coupled receptors (GPCRs). Moreover, the REEP family plays crucial roles in the occurrence and development of many diseases, including neurological diseases, diabetes, retinal diseases, cardiac diseases, infertility, obesity, oligoarticular juvenile idiopathic arthritis (OJIA), COVID-19, and cancer. In the present review, we describe the distribution and structure of the REEP family. Furthermore, we summarize the functions and the associated diseases of this family. Based on the pleiotropic actions of the REEP family, the study of its family members is crucial to understanding the relevant pathophysiological processes and developing strategies to modulate and control these related diseases. AVAILABILITY OF DATA AND MATERIAL: The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Affiliation(s)
- Sisi Fan
- Institute of Pharmacy and Pharmacology, Hunan Provincial Key Laboratory of tumor microenvironment responsive drug research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Huimei Liu
- Institute of Pharmacy and Pharmacology, Hunan Provincial Key Laboratory of tumor microenvironment responsive drug research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Lanfang Li
- Institute of Pharmacy and Pharmacology, Hunan Provincial Key Laboratory of tumor microenvironment responsive drug research, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China.
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13
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Heidarpour N, Singh A, Caputo JM, Barbieri R, Pampana VS, Kamath VG, Kaur G. Unfolding of Novel Independent Missense Mutations in VAMP2 and AGRN and Their Collective Role in Global Developmental Delay: A Case Report. Cureus 2022; 14:e28464. [PMID: 36176870 PMCID: PMC9511814 DOI: 10.7759/cureus.28464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/26/2022] [Indexed: 11/08/2022] Open
Abstract
Vesicle-associated membrane protein 2 (VAMP2) and Agrin (AGRN) are crucial proteins in neurotransmission. VAMP2 is a vesicular protein that facilitates the exocytosis of neurotransmitters. At the same time, AGRN plays a critical role in the maintenance and function of neuromuscular junctions. Mutations in the signaling pathway of VAMP2 and AGRN impair proper signaling between the presynaptic and postsynaptic neurons, and can result in neurodevelopmental conditions known as global developmental delay (GDD). This study highlights a presentation of GDD in a patient with concurrent mutations in VAMP2 and AGRN. A three-year-old female child presented with GDD characterized by hypotonia, intellectual disability, and dysphagia. Physical exam exhibited signs of developmental delay and severe muscle weakness. EEG findings were suggestive of a hypsarrhythmia pattern. The ophthalmological evaluation showed partial optic atrophy bilaterally. Therapeutic interventions included Keppra and Topamax, which proved ineffective. The patient’s outcome was inconclusive as care was transferred to another facility. This case study reports the novel appearance of two concurrent mutations: p.Gln76Pro associated with VAMP2 and p.Gln970Glu associated with AGRN. Mutations in VAMP2 lead to a dysfunctional SNARE complex and inhibit exocytosis of neurotransmitters into the synaptic cleft. Mutations in AGRN impair the ability to form and activate postsynaptic nicotinic acetylcholine receptors. Improper signaling between presynaptic and postsynaptic neurons is an important determinant of GDD. We hope that accounting for this mutational pattern will contribute to understanding synapse assembly and help unravel the complex interplay of factors involved in the pathology of neuromuscular disorders and GDD.
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14
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Li J, Yan WJ, Wu Y, Tian XX, Zhang YW. Synaptosomal-Associated Protein 25 Gene Polymorphisms Affect Treatment Efficiency of Methylphenidate in Children With Attention-Deficit Hyperactivity Disorder: An fNIRS Study. Front Behav Neurosci 2022; 15:793643. [PMID: 35069142 PMCID: PMC8766417 DOI: 10.3389/fnbeh.2021.793643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 12/13/2021] [Indexed: 11/13/2022] Open
Abstract
Methylphenidate (MPH) is the first-line drug for the treatment of children with attention-deficit hyperactivity disorder (ADHD); however, individual curative effects of MPH vary. Many studies have demonstrated that synaptosomal-associated protein 25 (SNAP-25) gene MnlI polymorphisms may be related to the efficacy of MPH. However, the association between SNAP-25MnlI polymorphisms and changes in brain hemodynamic responses after MPH treatment is still unclear. This study used functional near-infrared spectroscopy (fNIRS) to preliminarily investigate the interaction of MPH treatment-related prefrontal inhibitory functional changes with the genotype status of the SNAP-25 gene in children with ADHD. In total, 38 children with ADHD aged 6.76–12.08 years were enrolled in this study and divided into the following two groups based on SNAP-25 gene MnlI polymorphisms: T/T genotype group (wild-type group, 27 children) and G allele carrier group (mutation group, 11 children). The averaged oxygenated hemoglobin concentration changes [Δavg oxy-Hb] and deoxyhemoglobin concentration changes [Δavg deoxy-Hb] in the frontal cortex before MPH treatment and after 1.5 h (post-MPH1.5h) and 4 weeks (post-MPH4w) of MPH treatments were monitored using fNIRS during the go/no-go task. SNAP-IV scores were evaluated both pre-MPH and post-MPH4w treatments. In the T/T genotype group, [Δavg oxy-Hb] in the dorsolateral prefrontal cortex was significantly higher after 4 weeks of MPH (post-MPH4W) treatment than pre-treatment; however, in the G allele group, no significant differences in [Δavg oxy-Hb] were observed between pre- and post-treatments. In the go/no-go task, the accuracy was significantly increased post-MPH4w treatment in the T/T genotype group, while no significant differences were observed in response time and accuracy of the “go” sand no-go task in the G allele group for pre-MPH, post-MPH1.5h, and post-MPH4w treatments. The T/T genotype group exhibited a significant decrease in SNAP-IV scores after MPH treatment, while the G allele group showed no significant difference. In conclusion, fNIRS data combined with SNAP-25 MnlI polymorphism analysis may be a useful biomarker for evaluating the effects of MPH in children with ADHD.
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Affiliation(s)
- Jie Li
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
- Department of Pediatrics, Sichuan Academy of Medical Sciences and Sichuan Provincial People's Hospital, Chengdu, China
| | - Wen-Jie Yan
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yan Wu
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Xin-Xin Tian
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yi-Wen Zhang
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
- *Correspondence: Yi-Wen Zhang
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15
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Bunz M, Ritter M, Schindler M. HCV egress - unconventional secretion of assembled viral particles. Trends Microbiol 2021; 30:364-378. [PMID: 34483048 DOI: 10.1016/j.tim.2021.08.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 08/11/2021] [Accepted: 08/13/2021] [Indexed: 12/15/2022]
Abstract
It is believed that hepatitis C virus (HCV) particles are released through the canonical secretory route: from the endoplasmic reticulum (ER), via the Golgi, to the plasma membrane. While the Golgi is important for HCV release per se, its direct involvement in the trafficking of assembled virions has not yet been established. In fact, data from studies analyzing HCV egress are compatible with several potential pathways of HCV secretion. Here, we summarize and discuss the current knowledge related to the HCV export pathway. Apart from the prototypical anterograde transport, possible routes of HCV release include ER-to-endosomal transport, secretory autophagy, and poorly described mechanisms of unconventional protein secretion. Studying HCV egress promises to shed light on unconventional cellular trafficking and secretory routes.
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Affiliation(s)
- Maximilian Bunz
- Section Molecular Virology, Institute for Medical Virology and Epidemiology, University Hospital Tübingen, Tübingen, Germany
| | - Michael Ritter
- Section Molecular Virology, Institute for Medical Virology and Epidemiology, University Hospital Tübingen, Tübingen, Germany
| | - Michael Schindler
- Section Molecular Virology, Institute for Medical Virology and Epidemiology, University Hospital Tübingen, Tübingen, Germany.
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