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A founder RAB27A variant causes Griscelli syndrome type 2 with phenotypic heterogeneity in Qatari families

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submitted on 2023-03-15, 08:00 and posted on 2023-03-16, 06:18 authored by Reem Al‐Sulaiman, Amna Othman, Karen El‐Akouri, Shehab Fareed, Hajer AlMulla, Aseel Sukik, Mariam Al‐Mureikhi, Noora Shahbeck, Rehab Ali, Fatma Al‐Mesaifri, Sara Musa, Mariam Al‐Mulla, Khalid Ibrahim, Khalid Mohamed, Maryam Ali Al‐Nesef, Mohammad Ehlayel, Tawfeg Ben‐Omran

Griscelli syndrome type 2 (GS2) is a rare autosomal recessive disorder caused by pathogenic variants in the RAB27A gene and characterized by partial albinism, immunodeficiency, and occasional hematological and neurological involvement. We reviewed and analyzed the medical records of 12 individuals with GS2 from six families belonging to a highly consanguineous Qatari tribe and with a recurrent pathogenic variant in the RAB27A gene (NM_004580.4: c.244C > T, p.Arg82Cys). Detailed demographic, clinical, and molecular data were collected. Cutaneous manifestations were the most common presentation (42%), followed by neurological abnormalities (33%) and immunodeficiency (25%). The most severe manifestation was HLH (33%). Among the 12 patients, three patients (25%) underwent HSCT, and four (33%) died. The cause of death in all four patients was deemed HLH, providing evidence for this complication's fatal nature. Interestingly, two affected patients (16%) were asymptomatic. This report highlights the broad spectrum of clinical presentations of GS2 associated with a founder variant in the RAB27A gene (c.244C > T, p.Arg82Cys). Early suspicion of GS2 among Qatari patients with cutaneous manifestations, neurological findings, immunodeficiency, and HLH would shorten the diagnostic odyssey, guide early and appropriate treatment, and prevent fatal outcomes. 

Other Information

Published in: American Journal of Medical Genetics Part A
License: http://creativecommons.org/licenses/by/4.0/
See article on publisher's website: http://dx.doi.org/10.1002/ajmg.a.61829

History

Language

  • English

Publisher

Wiley

Publication Year

  • 2020

Institution affiliated with

  • Hamad Medical Corporation
  • Sidra Medical and Research Center
  • Weill Cornell Medical College in Qatar

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