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

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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
Issue number1
Early online date29 Sept 2021
Publication statusPublished - 1 Dec 2021

Bibliographical note

Funding Information:
We would like to thank all of the participating families. We are also grateful to the Swiss Confederation for the award of a PhD fellowship to AUR, to Mashhad University of Medical Sciences for supporting part of the work, in the framework of the PhD thesis of AS, to the Swiss National Science Foundation for grant # 176097 to CR, and to the Fondation Guillaume Gentil for support to ASF.


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