Open AccessNovel NR2F1 variant identified by whole-exome sequencing in a patient with Bosch–Boonstra–Schaaf optic atrophy syndrome
Author(s) -
Ayça Kocaağa,
Sevgi Yimenicioğlu,
Hüseyin Gürsoy
Publication year - 2022
Publication title -
indian journal of ophthalmology/indian journal of ophthalmology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.542
H-Index - 51
eISSN - 1998-3689
pISSN - 0301-4738
DOI - 10.4103/ijo.ijo_1061_22
Subject(s) - medicine , missense mutation , atrophy , hypotonia , exome sequencing , hearing loss , intellectual disability , pathology , genetics , audiology , mutation , pediatrics , gene , biology , psychiatry
Bosch-Boonstra-Schaaf optic atrophy syndrome (BBSOAS) is an extremely rare autosomal dominant disorder characterized by intellectual disability, developmental delay, seizures, hypotonia, hearing loss, and optic nerve atrophy. This syndrome is caused by loss-of-function variants in the nuclear receptor subfamily 2 group F member 1 (NR2F1) gene. To date, approximately 80 patients have been reported with BBSOAS. Here, we describe a 3-year-old infant with delayed development, intellectual disability, strabismus, nystagmus, and optic atrophy with well-characterized features associated with BBSOAS. Whole-exome sequencing revealed a novel heterozygous missense mutation (NM_005654.6:c.437G>A, p.Cys146Tyr) in the NR2F1 gene. This missense variant is predicted to be deleterious by the protein prediction tools (SIFT, PolyPhen-2, and MutationTaster). To the best of our knowledge, this is the first patient with BBSOAS reported from Turkey.