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Hozhabrpour A, Mojbafan M, Palizban F, Vahidnezhad F, Talebi S, Amani M, Garshasbi M, Naghavi A, Khalesi R, Mansouri P, Sotoudeh S, Mahmoudi H, Varghaei A, Daneshpazhooh M, Karimi F, Zeinali S, Kalamati E, Uitto J, Youssefian L, Vahidnezhad H. DNA repair-related heritable photosensitivity syndromes: Mutation landscape in a multiethnic cohort of 17 multigenerational families with high degree of consanguinity. DNA Repair (Amst) 2024; 136:103633. [PMID: 38422792 DOI: 10.1016/j.dnarep.2024.103633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 12/30/2023] [Accepted: 01/19/2024] [Indexed: 03/02/2024]
Abstract
Inherited photosensitivity syndromes are a heterogeneous group of genetic skin disorders with tremendous phenotypic variability, characterized by photosensitivity and defective DNA repair, especially nucleotide excision repair. A cohort of 17 Iranian families with heritable photosensitivity syndromes was evaluated to identify their genetic defect. The patients' DNA was analyzed with either whole-exome sequencing or RNA sequencing (RNA-Seq). The interpretations of the genomic results were guided by genome-wide homozygosity mapping. Haplotype analysis was performed for cases with recurrent mutations. RNA-Seq, in addition to mutation detection, was also utilized to confirm the pathogenicity. Thirteen sequence variants, including six previously unreported pathogenic variants, were disclosed in 17 Iranian families, with XPC as the most common mutated gene in 10 families (59%). In one patient, RNA-Seq, as a first-tier diagnostic approach, revealed a non-canonical homozygous germline variant: XPC:c.413-9 T > A. The Sashimi plot showed skipping of exon 4 with dramatic XPC down-expression. Haplotype analysis of XPC:c.2251-1 G>C and XPC:1243 C>T in four families showed common haplotypes of 1.7 Mb and 2.6 Mb, respectively, denoting a founder effect. Lastly, two extremely rare cases were presented in this report: a homozygous UVSSA:c .1990 C>T was disclosed, and ERCC2-related cerebro-oculo-facio-skeletal (COFS) syndrome with an early childhood death. A direct comparison of our data with the results of previously reported cohorts demonstrates the international mutation landscape of DNA repair-related photosensitivity disorders, although population-specific differences were observed.
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Affiliation(s)
- Amir Hozhabrpour
- Department of Medical Genetics, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Marzieh Mojbafan
- Department of Medical Genetics, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Fahimeh Palizban
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | - Saeed Talebi
- Department of Medical Genetics, School of Medicine, Iran University of Medical Sciences (IUMS), Tehran, Iran
| | - Maliheh Amani
- Clinical Research Development Unit of Allameh Bohlool Gonabadi Hospital, Gonabad University of Medical Sciences, Gonabad, Iran; Department of Dermatology, Gonabad University of Medical Sciences, Gonabad, Iran
| | - Masoud Garshasbi
- Department of Medical Genetics, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Anoosh Naghavi
- Cellular and Molecular Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Raziyeh Khalesi
- Department of Medical Genetics, DeNA Laboratory, Tehran, Iran
| | - Parvin Mansouri
- Skin and Stem Cell Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Soheila Sotoudeh
- Department of Dermatology, Children's Medical Center, Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Hamidreza Mahmoudi
- Department of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Aida Varghaei
- Department of Dermatology, School of Medicine, Urmia University of Medical Sciences, Urmia, Iran
| | - Maryam Daneshpazhooh
- Department of Dermatology, Autoimmune Bullous Diseases Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | | | | | - Elnaz Kalamati
- Department of Obstetrics and Gynecology, Imam Zaman Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Jouni Uitto
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA; Department of Dermatology and Cutaneous Biology, Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA, USA
| | - Leila Youssefian
- Department of Pathology and Laboratory Medicine, UCLA Clinical Genomics Center, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA.
| | - Hassan Vahidnezhad
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA; Department of Dermatology and Cutaneous Biology, Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA, USA; Center for Applied Genomics, Children's Hospital of Philadelphia, Philadelphia, PA, USA; Division of Human Genetics, Children's Hospital of Philadelphia, Philadelphia, PA, USA; Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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