Whole-genome sequencing in patients with ciliopathies uncovers a novel recurrent tandem duplication in IFT140

Autor: Séverine Bär, Anne Boland, Hélène Blanché, Steven McGinn, Dominique Martin-Coignard, Katja Kloth, Hélène Dollfus, Elise Schaefer, Corinne Stoetzel, Anne-Sophie Leuvrey, Sophie Scheidecker, Günter Klaus, Jean Muller, Jean-François Deleuze, Eva Decker, Véronique Geoffroy, Charline Henry, Christoph J. Mache, Manuela Antin, Carsten Bergmann, Marion Delbarre, Ariane Kröll, Jean-Michel Rozet, Sylvie Friant, Isabelle Perrault, Sophie Saunier
Rok vydání: 2018
Předmět:
Zdroj: Human Mutation. 39:983-992
ISSN: 1059-7794
DOI: 10.1002/humu.23539
Popis: Ciliopathies represent a wide spectrum of rare diseases with overlapping phenotypes and a high genetic heterogeneity. Among those, IFT140 is implicated in a variety of phenotypes ranging from isolated retinis pigmentosa to more syndromic cases. Using whole-genome sequencing in patients with uncharacterized ciliopathies, we identified a novel recurrent tandem duplication of exon 27-30 (6.7 kb) in IFT140, c.3454-488_4182+2588dup p.(Tyr1152_Thr1394dup), missed by whole-exome sequencing. Pathogenicity of the mutation was assessed on the patients' skin fibroblasts. Several hundreds of patients with a ciliopathy phenotype were screened and biallelic mutations were identified in 11 families representing 12 pathogenic variants of which seven are novel. Among those unrelated families especially with a Mainzer-Saldino syndrome, eight carried the same tandem duplication (two at the homozygous state and six at the heterozygous state). In conclusion, we demonstrated the implication of structural variations in IFT140-related diseases expanding its mutation spectrum. We also provide evidences for a unique genomic event mediated by an Alu-Alu recombination occurring on a shared haplotype. We confirm that whole-genome sequencing can be instrumental in the ability to detect structural variants for genomic disorders.
Databáze: OpenAIRE
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