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Exome sequencing identifies novel NTRK1 mutations in patients with HSAN‐IV phenotype
Author(s) -
Altassan Ruqaiah,
Saud Haya Al,
Masoodi Tariq Ahmad,
Dosssari Haya Al,
Khalifa Ola,
AlZaidan Hamad,
Sakati Nadia,
Rhabeeni Zuhair,
AlHassnan Zuhair,
Binamer Yousef,
Alhashemi Nadia,
Wade William,
AlZayed Zayed,
AlSayed Moeen,
AlMuhaizea Mohamed A.,
Meyer Brian,
AlOwain Mohammad,
Wakil Salma M.
Publication year - 2017
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.38120
Subject(s) - missense mutation , anhidrosis , exome sequencing , exome , medicine , genetics , phenotype , biology , gene , dermatology
Hereditary sensory autonomic neuropathy type IV (HSAN‐IV) is a rare autosomal recessive disorder that usually begins in infancy and is characterized by anhidrosis, insensitivity to noxious stimuli leading to self‐mutilating behavior, and intellectual disability. HSAN‐IV is caused by mutations in the neurotrophic tyrosine kinase receptor type 1 gene, NTRK1, encoding the high‐affinity receptor of nerve growth factor (NGF) which maps to chromosome 1q21‐q22. Patients with HSAN‐IV lack all NGF‐dependent neurons, the primary afferents and sympathetic postganglionic neurons leading to lack of pain sensation and the presence of anhidrosis, respectively. Herein, we report nine patients from nine unrelated families with HSAN‐IV due to various mutations in NTRK1, five of which are novel. These are three missense and two nonsense mutations distributed in various domains of NTRK1 involved in binding of NGF. The affected patients had variable intellectual deficits, and some had delayed diagnosis of HSAN‐IV. In addition to being the first report of HSAN‐IV from the Arabian Peninsula, this report expands the mutational spectrum of patients with NTRK1 mutations and provides further insights for molecular and clinical diagnosis.