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Genome-Wide Single Nucleotide Polymorphism-Based Autozygosity Mapping Facilitates Identification of Mutations in Consanguineous Families With Epidermolysis Bullosa Publisher Pubmed



Vahidnezhad H1, 2 ; Youssefian L1, 3 ; Saeidian AH1 ; Zeinali S2, 4 ; Touati A1, 5 ; Abiri M4, 6 ; Sotoudeh S7 ; Norouzzadeh S4, 8 ; Amirinezhad N4, 8 ; Mozafari N9 ; Daneshpazhooh M10 ; Mahmoudi H10 ; Hamid M2 ; Bradfield JP11 Show All Authors
Authors
  1. Vahidnezhad H1, 2
  2. Youssefian L1, 3
  3. Saeidian AH1
  4. Zeinali S2, 4
  5. Touati A1, 5
  6. Abiri M4, 6
  7. Sotoudeh S7
  8. Norouzzadeh S4, 8
  9. Amirinezhad N4, 8
  10. Mozafari N9
  11. Daneshpazhooh M10
  12. Mahmoudi H10
  13. Hamid M2
  14. Bradfield JP11
  15. Kim CE11
  16. Hakonarson H11, 12
  17. Uitto J1

Source: Experimental Dermatology Published:2019


Abstract

Autozygosity mapping (AM) is a technique utilised for mapping homozygous autosomal recessive (AR) traits and facilitation of genetic diagnosis. We investigated the utility of AM for the molecular diagnosis of heterogeneous AR disorders, using epidermolysis bullosa (EB) as a paradigm. We applied this technique to a cohort of 46 distinct EB families using both short tandem repeat (STR) and genome-wide single nucleotide polymorphism (SNP) array-based AM to guide targeted Sanger sequencing of EB candidate genes. Initially, 39 of the 46 cases were diagnosed with homozygous mutations using this method. Independently, 26 cases, including the seven initially unresolved cases, were analysed with an EB-targeted next-generation sequencing (NGS) panel. NGS identified mutations in five additional cases, initially undiagnosed due to the presence of compound heterozygosity, deep intronic mutations or runs of homozygosity below the set threshold of 2 Mb, for a total yield of 44 of 46 cases (95.7%) diagnosed genetically. © 2018 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
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