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A novel de novo ACTA1 variant in a patient with nemaline myopathy and mitochondrial Complex I deficiency

Lookup NU author(s): Professor Robert Taylor

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Abstract

© 2019. We describe the presentation and follow-up of a three-year-old girl with nemaline myopathy due to a de-novo variant in ACTA1 (encoding skeletal alpha actin) and moderately low enzyme level of Complex I of the mitochondrial respiratory chain. She presented in the neonatal period with hypotonia, followed by weakness in the facial, bulbar, respiratory and neck flexors muscles. A biopsy of her quadriceps muscle at the age of one year showed nemaline rods. Based on her clinical presentation of a congenital myopathy and histopathological features on a muscle biopsy, ACTA1 was sequenced, and this revealed a novel sequence variant, c.760 A>C p. (Asn254His). In addition, mitochondrial respiratory chain enzymatic activity of skeletal muscle biopsy showed a moderately low activity of complex I (nicotinamide adenine dinucleotide (NADH): ubiquinone oxidoreductase). Disturbances of Complex I of the respiratory chain have been reported in patients with nemaline myopathy, although the mechanism remains unclear.

Publication metadata

Author(s): Pula S, Urankar K, Norman A, Pierre G, Langton-Hewer S, Selby V, Mason F, Vijayakumar K, McFarland R, Taylor RW, Majumdar A

Publication type: Article

Publication status: Published

Journal: Neuromuscular Disorders

Year: 2020

Volume: 30

Issue: 2

Pages: 159-164

Print publication date: 01/02/2020

Online publication date: 01/12/2019

Acceptance date: 28/11/2019

ISSN (print): 0960-8966

ISSN (electronic): 1873-2364

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.nmd.2019.11.014

DOI: 10.1016/j.nmd.2019.11.014

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