Recessive MYH7-related myopathy in two families

Sarah J. Beecroft, Martijn van de Locht, Josine M. de Winter, Coen A. Ottenheijm, Caroline A. Sewry, Shehla Mohammed, Monique M. Ryan, Ian R. Woodcock, Lauren Sanders, Rebecca Gooding, Mark R. Davis, Emily C. Oates, Nigel G. Laing, Gianina Ravenscroft, Catriona A. McLean, Heinz Jungbluth

Research output: Contribution to journalArticle

Abstract

Myopathies due to recessive MYH7 mutations are exceedingly rare, reported in only two families to date. We describe three patients from two families (from Australia and the UK) with a myopathy caused by recessive mutations in MYH7. The Australian family was homozygous for a c.5134C > T, p.Arg1712Trp mutation, whilst the UK patient was compound heterozygous for a truncating (c.4699C > T; p.Gln1567*) and a missense variant (c.4664A > G; p.Glu1555Gly). All three patients shared key clinical features, including infancy/childhood onset, pronounced axial/proximal weakness, spinal rigidity, severe scoliosis, and normal cardiac function. There was progressive respiratory impairment necessitating non-invasive ventilation despite preserved ambulation, a combination of features often seen in SEPN1- or NEB-related myopathies. On biopsy, the Australian proband showed classical myosin storage myopathy features, while the UK patient showed multi-minicore like areas. To establish pathogenicity of the Arg1712Trp mutation, we expressed mutant MYH7 protein in COS-7 cells, observing abnormal mutant myosin aggregation compared to wild-type. We describe skinned myofiber studies of patient muscle and hypertrophy of type II myofibers, which may be a compensatory mechanism. In summary, we have expanded the phenotype of ultra-rare recessive MYH7 disease, and provide novel insights into associated changes in muscle physiology.

Original languageEnglish
Pages (from-to)456-467
Number of pages12
JournalNeuromuscular Disorders
Volume29
Issue number6
DOIs
Publication statusPublished - Jun 2019

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Muscular Diseases
Mutation
Noninvasive Ventilation
Muscles
COS Cells
Scoliosis
Mutant Proteins
Myosins
Hypertrophy
Walking
Virulence
Phenotype
Biopsy

Cite this

Beecroft, S. J., van de Locht, M., de Winter, J. M., Ottenheijm, C. A., Sewry, C. A., Mohammed, S., ... Jungbluth, H. (2019). Recessive MYH7-related myopathy in two families. Neuromuscular Disorders, 29(6), 456-467. https://doi.org/10.1016/j.nmd.2019.04.002
Beecroft, Sarah J. ; van de Locht, Martijn ; de Winter, Josine M. ; Ottenheijm, Coen A. ; Sewry, Caroline A. ; Mohammed, Shehla ; Ryan, Monique M. ; Woodcock, Ian R. ; Sanders, Lauren ; Gooding, Rebecca ; Davis, Mark R. ; Oates, Emily C. ; Laing, Nigel G. ; Ravenscroft, Gianina ; McLean, Catriona A. ; Jungbluth, Heinz. / Recessive MYH7-related myopathy in two families. In: Neuromuscular Disorders. 2019 ; Vol. 29, No. 6. pp. 456-467.
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abstract = "Myopathies due to recessive MYH7 mutations are exceedingly rare, reported in only two families to date. We describe three patients from two families (from Australia and the UK) with a myopathy caused by recessive mutations in MYH7. The Australian family was homozygous for a c.5134C > T, p.Arg1712Trp mutation, whilst the UK patient was compound heterozygous for a truncating (c.4699C > T; p.Gln1567*) and a missense variant (c.4664A > G; p.Glu1555Gly). All three patients shared key clinical features, including infancy/childhood onset, pronounced axial/proximal weakness, spinal rigidity, severe scoliosis, and normal cardiac function. There was progressive respiratory impairment necessitating non-invasive ventilation despite preserved ambulation, a combination of features often seen in SEPN1- or NEB-related myopathies. On biopsy, the Australian proband showed classical myosin storage myopathy features, while the UK patient showed multi-minicore like areas. To establish pathogenicity of the Arg1712Trp mutation, we expressed mutant MYH7 protein in COS-7 cells, observing abnormal mutant myosin aggregation compared to wild-type. We describe skinned myofiber studies of patient muscle and hypertrophy of type II myofibers, which may be a compensatory mechanism. In summary, we have expanded the phenotype of ultra-rare recessive MYH7 disease, and provide novel insights into associated changes in muscle physiology.",
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Beecroft, SJ, van de Locht, M, de Winter, JM, Ottenheijm, CA, Sewry, CA, Mohammed, S, Ryan, MM, Woodcock, IR, Sanders, L, Gooding, R, Davis, MR, Oates, EC, Laing, NG, Ravenscroft, G, McLean, CA & Jungbluth, H 2019, 'Recessive MYH7-related myopathy in two families' Neuromuscular Disorders, vol. 29, no. 6, pp. 456-467. https://doi.org/10.1016/j.nmd.2019.04.002

Recessive MYH7-related myopathy in two families. / Beecroft, Sarah J.; van de Locht, Martijn; de Winter, Josine M.; Ottenheijm, Coen A.; Sewry, Caroline A.; Mohammed, Shehla; Ryan, Monique M.; Woodcock, Ian R.; Sanders, Lauren; Gooding, Rebecca; Davis, Mark R.; Oates, Emily C.; Laing, Nigel G.; Ravenscroft, Gianina; McLean, Catriona A.; Jungbluth, Heinz.

In: Neuromuscular Disorders, Vol. 29, No. 6, 06.2019, p. 456-467.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Recessive MYH7-related myopathy in two families

AU - Beecroft, Sarah J.

AU - van de Locht, Martijn

AU - de Winter, Josine M.

AU - Ottenheijm, Coen A.

AU - Sewry, Caroline A.

AU - Mohammed, Shehla

AU - Ryan, Monique M.

AU - Woodcock, Ian R.

AU - Sanders, Lauren

AU - Gooding, Rebecca

AU - Davis, Mark R.

AU - Oates, Emily C.

AU - Laing, Nigel G.

AU - Ravenscroft, Gianina

AU - McLean, Catriona A.

AU - Jungbluth, Heinz

PY - 2019/6

Y1 - 2019/6

N2 - Myopathies due to recessive MYH7 mutations are exceedingly rare, reported in only two families to date. We describe three patients from two families (from Australia and the UK) with a myopathy caused by recessive mutations in MYH7. The Australian family was homozygous for a c.5134C > T, p.Arg1712Trp mutation, whilst the UK patient was compound heterozygous for a truncating (c.4699C > T; p.Gln1567*) and a missense variant (c.4664A > G; p.Glu1555Gly). All three patients shared key clinical features, including infancy/childhood onset, pronounced axial/proximal weakness, spinal rigidity, severe scoliosis, and normal cardiac function. There was progressive respiratory impairment necessitating non-invasive ventilation despite preserved ambulation, a combination of features often seen in SEPN1- or NEB-related myopathies. On biopsy, the Australian proband showed classical myosin storage myopathy features, while the UK patient showed multi-minicore like areas. To establish pathogenicity of the Arg1712Trp mutation, we expressed mutant MYH7 protein in COS-7 cells, observing abnormal mutant myosin aggregation compared to wild-type. We describe skinned myofiber studies of patient muscle and hypertrophy of type II myofibers, which may be a compensatory mechanism. In summary, we have expanded the phenotype of ultra-rare recessive MYH7 disease, and provide novel insights into associated changes in muscle physiology.

AB - Myopathies due to recessive MYH7 mutations are exceedingly rare, reported in only two families to date. We describe three patients from two families (from Australia and the UK) with a myopathy caused by recessive mutations in MYH7. The Australian family was homozygous for a c.5134C > T, p.Arg1712Trp mutation, whilst the UK patient was compound heterozygous for a truncating (c.4699C > T; p.Gln1567*) and a missense variant (c.4664A > G; p.Glu1555Gly). All three patients shared key clinical features, including infancy/childhood onset, pronounced axial/proximal weakness, spinal rigidity, severe scoliosis, and normal cardiac function. There was progressive respiratory impairment necessitating non-invasive ventilation despite preserved ambulation, a combination of features often seen in SEPN1- or NEB-related myopathies. On biopsy, the Australian proband showed classical myosin storage myopathy features, while the UK patient showed multi-minicore like areas. To establish pathogenicity of the Arg1712Trp mutation, we expressed mutant MYH7 protein in COS-7 cells, observing abnormal mutant myosin aggregation compared to wild-type. We describe skinned myofiber studies of patient muscle and hypertrophy of type II myofibers, which may be a compensatory mechanism. In summary, we have expanded the phenotype of ultra-rare recessive MYH7 disease, and provide novel insights into associated changes in muscle physiology.

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Beecroft SJ, van de Locht M, de Winter JM, Ottenheijm CA, Sewry CA, Mohammed S et al. Recessive MYH7-related myopathy in two families. Neuromuscular Disorders. 2019 Jun;29(6):456-467. https://doi.org/10.1016/j.nmd.2019.04.002