Whole exome sequencing in 17 consanguineous Iranian pedigrees expands the mutational spectrum of inherited retinal dystrophies

Atta Ur Rehman, Neda Sepahi, Nicola Bedoni, Zeinab Ravesh, Arash Salmaninejad, Francesca Cancellieri, Virginie G. Peter, Mathieu Quinodoz, Majid Mojarrad, Alireza Pasdar, Ali Ghanbari Asad, Saman Ghalamkari, Mehran Piran, Mehrdad Piran, Andrea Superti-Furga, Carlo Rivolta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Inherited retinal dystrophies (IRDs) constitute one of the most heterogeneous groups of Mendelian human disorders. Using autozygome-guided next-generation sequencing methods in 17 consanguineous pedigrees of Iranian descent with isolated or syndromic IRD, we identified 17 distinct genomic variants in 11 previously-reported disease genes. Consistent with a recessive inheritance pattern, as suggested by pedigrees, variants discovered in our study were exclusively bi-allelic and mostly in a homozygous state (in 15 families out of 17, or 88%). Out of the 17 variants identified, 5 (29%) were never reported before. Interestingly, two mutations (GUCY2D:c.564dup, p.Ala189ArgfsTer130 and TULP1:c.1199G > A, p.Arg400Gln) were also identified in four separate pedigrees (two pedigrees each). In addition to expanding the mutational spectrum of IRDs, our findings confirm that the traditional practice of endogamy in the Iranian population is a prime cause for the appearance of IRDs.

Original languageEnglish
Article number19332
Number of pages9
JournalScientific Reports
Volume11
Issue number1
Early online date29 Sep 2021
DOIs
Publication statusE-pub ahead of print - 29 Sep 2021

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