Biallelic pathogenic variants in the lanosterol synthase gene LSS involved in the cholesterol biosynthesis cause alopecia with intellectual disability, a rare recessive neuroectodermal syndrome. - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Genetics in Medicine Année : 2019

Biallelic pathogenic variants in the lanosterol synthase gene LSS involved in the cholesterol biosynthesis cause alopecia with intellectual disability, a rare recessive neuroectodermal syndrome.

Xavier Balguerie
  • Fonction : Auteur
Anne-Claire Bursztejn
  • Fonction : Auteur
  • PersonId : 789274
  • IdRef : 177203874
Rhonda E Schnur
  • Fonction : Auteur
Yue Si
  • Fonction : Auteur
Erin Torti
  • Fonction : Auteur

Résumé

Purpose Lanosterol synthase (LSS) gene was initially described in families with extensive congenital cataracts. Recently, a study has highlighted LSS associated with hypotrichosis simplex. We expanded the phenotypic spectrum of LSS to a recessive neuroectodermal syndrome formerly named alopecia with mental retardation (APMR) syndrome. It is a rare autosomal recessive condition characterized by hypotrichosis and intellectual disability (ID) or developmental delay (DD), frequently associated with early-onset epilepsy and other dermatological features. Methods Through a multicenter international collaborative study, we identified LSS pathogenic variants in APMR individuals either by exome sequencing or LSS Sanger sequencing. Splicing defects were assessed by transcript analysis and minigene assay. Results We reported ten APMR individuals from six unrelated families with biallelic variants in LSS. We additionally identified one affected individual with a single rare variant in LSS and an allelic imbalance suggesting a second event. Among the identified variants, two were truncating, seven were missense, and two were splicing variants. Quantification of cholesterol and its precursors did not reveal noticeable imbalance. Conclusion In the cholesterol biosynthesis pathway, lanosterol synthase leads to the cyclization of (S)-2,3-oxidosqualene into lanosterol. Our data suggest LSS as a major gene causing a rare recessive neuroectodermal syndrome.

Dates et versions

hal-02629360 , version 1 (27-05-2020)

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Citer

Thomas Besnard, Natacha Sloboda, Alice Goldenberg, Sébastien Küry, Benjamin Cogné, et al.. Biallelic pathogenic variants in the lanosterol synthase gene LSS involved in the cholesterol biosynthesis cause alopecia with intellectual disability, a rare recessive neuroectodermal syndrome.. Genetics in Medicine, 2019, 21 (9), pp.2025-2035. ⟨10.1038/s41436-019-0445-x⟩. ⟨hal-02629360⟩
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