Whole-exome sequence analysis highlights the role of unmasked recessive mutations in copy number variants with incomplete penetrance.

Egloff M, Nguyen LS, Siquier-Pernet K, Cormier-Daire V, Baujat G, Attié-Bitach T, Bole-Feysot C, Nitschke P, Vekemans M, Colleaux L, Malan V.

Source : Eur. J. Hum. Genet.

2019 Feb 21

Pmid : 29483668


Several hypotheses have been proposed to explain the phenotypic variability between parent and offspring carrying the same genomic imbalance, including unmasking of a recessive variant by a chromosomal deletion. Here, 19 patients with neurodevelopmental disorders harboring a rare deletion inherited from a healthy parent were investigated by whole-exome sequencing to search for SNV on the contralateral segment. This strategy allowed us to identify a candidate variant in two patients in the NUP214 and NCOR1 genes. This result demonstrates that the analysis of the genes included in non-deleted contralateral allele is a key point in the etiological investigation of patients harboring a deletion inherited from a parent. Finally, this strategy is also an interesting approach to identify new recessive intellectual disability genes.

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