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Novel cofilin-2 (CFL2) four base pair deletion causing nemaline myopathy
  1. Royston W Ong1,
  2. Abdulaziz AlSaman2,3,
  3. Duygu Selcen4,
  4. Arash Arabshahi1,
  5. Kyle S Yau1,
  6. Gianina Ravenscroft1,
  7. Rachael M Duff1,
  8. Vanessa Atkinson5,
  9. Richard J Allcock6,7,
  10. Nigel G Laing1,5
  1. 1 Centre for Medical Research, University of Western Australia, Harry Perkins Institute for Medical Research, QEII Medical Centre, Nedlands, Western Australia, Australia
  2. 2 Pediatric Neurology Department, National Neuroscience Institute, King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia
  3. 3 College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Kingdom of Saudi Arabia
  4. 4 Division of Child Neurology and Neuromuscular Disease Research Laboratory, Department of Neurology, Mayo Clinic College of Medicine, Mayo Clinic, Rochester, Minnesota, USA
  5. 5 Neurogenetics Unit, Department of Diagnostic Genomics, PathWest Laboratory Medicine Level 2 PP Building, QEII Medical Centre, Nedlands, Western Australia, Australia
  6. 6 Lotterywest State Biomedical Facility Genomics, School of Pathology and Laboratory Medicine, University of Western Australia, Perth, Western Australia, Australia
  7. 7 Department of Clinical Immunology, Royal Perth Hospital, Perth, Western Australia, Australia
  1. Correspondence to Professor Nigel G Laing, Centre for Medical Research, University of Western Australia, Harry Perkins Institute for Medical Research, QEII Medical Centre, QQ Block, 6 Verdun Street, Nedlands, Western Australia 6009, Australia; nigel.laing{at}uwa.edu.au

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Nemaline myopathy is one of the major subtypes of congenital myopathy and is known to be caused by mutations in nine genes including cofilin-2 (CFL2).1 Typical nemaline myopathy presentations include proximal weakness, hypotonia, respiratory difficulties and facial weakness.1

Results

This study was approved by The University of Western Australia Human Research Ethics Committee with written consent from patients.

After an uneventful birth the proband was admitted to the intensive care unit (ICU) with respiratory distress, although he did not require mechanical ventilation and was discharged after 5 days. A few weeks later he was readmitted following recurrent episodes of apnoea lasting seconds, associated with cyanosis. Most episodes presented after feeding and were aborted by stimulation. Upon admission to ICU, hypotension and respiratory acidosis were detected and orotracheal intubation and mechanical ventilation initiated. After correcting metabolic disturbances, the patient remained hypotonic, though fully awake and alert when taken off sedation. Extraocular movements were estimated to be normal and deep tendon reflexes were present. Head circumference was on the third centile. Extubation failed and the patient required 24-h continuous ventilation support before passing away at 12 months. Nerve conduction studies, MRI, EEG and echocardiography were normal. An electromyograph (EMG) showed apparent myotonic discharges and serum creatine kinase (CK) was mildly elevated.

The proband was Saudi Arabian and his parents were first cousins (figure 1A). Two cousins of the proband (figure 1A III:3 and III.4) had a similar disease, both requiring 24-h mechanical ventilation. One cousin (III:3) passed away at 14 months, while the 10-month-old brother (III:4) is still on 24-h ventilation. Due to the severity of the disease in the proband, diagnostic mutation analysis of SMN1 and ACTA1 was performed, but both were excluded.

Figure 1

Genetic, histological and immunohistochemical analysis of the CFL2 variant identified through whole exome sequencing. (A) Partial pedigree …

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