{"title":"Clinicogenetic characterisation of SLC29A3-related syndromes: a case series, tracing ancestral variants and molecular dynamics simulation.","authors":"Sajjad Biglari, Mohammad Shahrooei, Fatemeh Vahidnezhad, Leila Youssefian, Vahid Ziaee, Nima Rezaei, Atefeh Sohanforooshan Moghaddam, Sahar Sedighzadeh, Hossein Moravej, Parisa Safari Foroushani, Majid Keivanfar, Homa Ilkhanipoor, Amir Hozhabrpour, Hooria Seyedhosseini-Ghaheh, Iraj Mohammadzadeh, Majid Naderi, Elham Sheikhi Ghayur, Nader Mansour Samaei, Saeed Dorgaleleh, Emran Esmaeilzadeh, Roya Sherkat, Hamid Reza Khorram Khorshid, Mohammad Amin Tabatabaiefar, Hakon Hakonarson, Hassan Vahidnezhad","doi":"10.1136/jmg-2024-110606","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>SLC29A3-related syndromes (SLC29A3-RS) are characterised by severe and multiorgan involvement that has a severe impact on the quality of life of the affected persons and therefore merit further genetic and clinical research. We investigated the clinical and genetic aspects of patients with SLC29A3-RS.</p><p><strong>Methods: </strong>Six pathogenic variants of the <i>SLC29A3</i> gene were identified in eight families in the current study. RNA sequencing was used for evaluating <i>SLC29A3</i> variant gene expression and protein stability by molecular dynamics (MD) simulations. This study conducted a Preferred Reporting Items for Systematic Reviews and Meta-Analyses-compliant systematic review of cases across five electronic databases.</p><p><strong>Results: </strong>Genetic analysis revealed six pathogenic variants of the <i>SLC29A3</i> gene in eight families; one variant was shared among three families, indicating a possible founder effect. The estimated most recent common ancestor for these patients lived approximately 8.5 generations ago. MD studies revealed structural instability in mutant proteins. RNA sequencing also demonstrated that the expression of SLC29A3 was downregulated while the expression of the immune markers CD68 and LYZ was upregulated. A systematic search of 197 patients of different ethnic backgrounds revealed that the following symptoms were frequent findings: hyperpigmentation, hypertrichosis, hearing loss, short stature and hepatomegaly. The age of onset of SLC29A3-RS was 5.53±5.24 years with an IQR of 1.4-8.25 years.</p><p><strong>Conclusions: </strong>The characterisation of the founder variants and the genotype-phenotype correlations helps delineate the phenotype spectrum of SLC29A3-RS, which will facilitate the genetic counselling and screening of the high-risk population. Findings on <i>SLC29A3</i> variants show the way to proceed in the process of developing the diagnostic and therapeutic methods in the management of SLC29A3-RS.</p>","PeriodicalId":16237,"journal":{"name":"Journal of Medical Genetics","volume":" ","pages":""},"PeriodicalIF":3.5000,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Medical Genetics","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1136/jmg-2024-110606","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GENETICS & HEREDITY","Score":null,"Total":0}
引用次数: 0
Abstract
Background: SLC29A3-related syndromes (SLC29A3-RS) are characterised by severe and multiorgan involvement that has a severe impact on the quality of life of the affected persons and therefore merit further genetic and clinical research. We investigated the clinical and genetic aspects of patients with SLC29A3-RS.
Methods: Six pathogenic variants of the SLC29A3 gene were identified in eight families in the current study. RNA sequencing was used for evaluating SLC29A3 variant gene expression and protein stability by molecular dynamics (MD) simulations. This study conducted a Preferred Reporting Items for Systematic Reviews and Meta-Analyses-compliant systematic review of cases across five electronic databases.
Results: Genetic analysis revealed six pathogenic variants of the SLC29A3 gene in eight families; one variant was shared among three families, indicating a possible founder effect. The estimated most recent common ancestor for these patients lived approximately 8.5 generations ago. MD studies revealed structural instability in mutant proteins. RNA sequencing also demonstrated that the expression of SLC29A3 was downregulated while the expression of the immune markers CD68 and LYZ was upregulated. A systematic search of 197 patients of different ethnic backgrounds revealed that the following symptoms were frequent findings: hyperpigmentation, hypertrichosis, hearing loss, short stature and hepatomegaly. The age of onset of SLC29A3-RS was 5.53±5.24 years with an IQR of 1.4-8.25 years.
Conclusions: The characterisation of the founder variants and the genotype-phenotype correlations helps delineate the phenotype spectrum of SLC29A3-RS, which will facilitate the genetic counselling and screening of the high-risk population. Findings on SLC29A3 variants show the way to proceed in the process of developing the diagnostic and therapeutic methods in the management of SLC29A3-RS.
期刊介绍：
Journal of Medical Genetics is a leading international peer-reviewed journal covering original research in human genetics, including reviews of and opinion on the latest developments. Articles cover the molecular basis of human disease including germline cancer genetics, clinical manifestations of genetic disorders, applications of molecular genetics to medical practice and the systematic evaluation of such applications worldwide.
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