Biallelic mutations in DYNC2LI1 are a rare cause of Ellis-van Creveld syndrome

M Niceta, K Margiotti, M C Digilio, V Guida, A Bruselles, S Pizzi, A Ferraris, L Memo, N Laforgia, M L Dentici, F Consoli, I Torrente, V L Ruiz-Perez, B Dallapiccola, B Marino, A De Luca, M Tartaglia

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Abstract

Ellis-van Creveld syndrome (EvC) is a chondral and ectodermal dysplasia caused by biallelic mutations in the EVC, EVC2 and WDR35 genes. A proportion of cases with clinical diagnosis of EvC, however, do not carry mutations in these genes. To identify the genetic cause of EvC in a cohort of mutation-negative patients, exome sequencing was undertaken in a family with 3 affected members, and mutation scanning of a panel of clinically and functionally relevant genes was performed in 24 additional subjects with features fitting/overlapping EvC. Compound heterozygosity for the c.2T>C (p.Met1?) and c.662C>T (p.Thr221Ile) variants in DYNC2LI1, which encodes a component of the intraflagellar transport-related dynein-2 complex previously found mutated in other short-rib thoracic dysplasias, was identified in the 3 affected members of the first family. Targeted resequencing detected compound heterozygosity for the same missense variant and a truncating change (p.Val141*) in 2 siblings with EvC from a second family, while a newborn with a more severe phenotype carried 2 DYNC2LI1 truncating variants. Our findings indicate that DYNC2LI1 mutations are associated with a wider clinical spectrum than previously appreciated, including EvC, with the severity of the phenotype likely depending on the extent of defective DYNC2LI1 function.

Original languageEnglish
JournalClinical Genetics
DOIs
Publication statusE-pub ahead of print - Aug 30 2017

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Keywords

  • Journal Article

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