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Intractable Rare Dis Res. 2019 May;8(2):142-145. doi: 10.5582/irdr.2019.01052.

A novel mutation in TTN gene in a Saudi patient with bilateral facial weakness and scapular winging.

Author information

1
King Abdulaziz Medical City / King Saud bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia.
2
King Abdullah International Medical Research Center/King Saud bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia.
3
King Saud bin Abdulaziz University for Health Sciences, Jeddah, Saudi Arabia.
4
Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, Saudi Arabia.
5
Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.

Abstract

Titin (TTN) is a large gene with 363 exons that encodes a large abundant protein (longest known polypeptide in nature) that is expressed in cardiac and skeletal muscles. TTN has an important role in the sarcomere organization, assembly of muscles, transmission of the force at the Z-line, passive myocyte stiffness, and resting tension maintenance in the I-band region. Mutation in extreme C terminus of TTN, situated at the end of M-band of the TTN in chromosome 2q31, results in tibial muscular dystrophy (TMD), also called Udd Distal Myopathy, which is an autosomal dominant distal myopathy. In this article, we report a novel mutation in TTN gene in a Saudi patient with bilateral facial weakness and scapular winging. This report adds to the literature a heterozygous missense variant c.85652C>G, p.(Pro28551Arg) in TTN gene, which may be related to genes that cause the disease, but more case validation is needed. The novel mutation described in the present study widened the genetic spectrum of TTN-associated diseases, which may benefit studies addressing this disease in the future.

KEYWORDS:

Saudi Arabia; TTN; Titin; neuromuscular disorders; tibial muscular dystrophy

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