Nemaline body myopathy caused by a novel mutation in troponin T1 (TNNT1).

Abstract:

INTRODUCTION:Nemaline myopathy is a rare disorder characterized by skeletal muscle weakness of varying severity and onset, with the presence of nemaline rods on muscle biopsy. Congenital nemaline body myopathy due to mutations in TNNT1 has hitherto only been described as a result of a single founder mutation in patients of Amish origin and in 2 other individuals with different recessive mutations. METHODS:Autozygosity mapping and whole exome sequencing were applied after we identified 9 Palestinian patients from 7 unrelated families who have nemaline myopathy. RESULTS:All patients were homozygous for a novel complex rearrangement of the TNNT1 gene (c.574_577delinsTAGTGCTGT | NM_003283) leading to C-terminal truncation of the protein (p.L203* | NP_003274.3). Their clinical course was remarkable for early respiratory failure and striking stiffness of the cervical spine. CONCLUSIONS:This report exemplifies the utility of combining autozygosity mapping and whole exome sequencing and expands the phenotype associated with TNNT1 mutations.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Abdulhaq UN,Daana M,Dor T,Fellig Y,Eylon S,Schuelke M,Shaag A,Elpeleg O,Edvardson S

doi

10.1002/mus.24885

subject

Has Abstract

pub_date

2016-04-01 00:00:00

pages

564-9

issue

4

eissn

0148-639X

issn

1097-4598

journal_volume

53

pub_type

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