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Ravenscroft G, Pannell S, O'Grady G, Ong R, Ee HC, Faiz F, Marns L, Goel H, Kumarasinghe P, Sollis E, Sivadorai P, Wilson M, Magoffin A, Nightingale S, Freckmann ML, Kirk EP, Sachdev R, Lemberg DA, Delatycki MB, Kamm MA, Basnayake C, Lamont PJ, Amor DJ, Jones K, Schilperoort J, Davis MR, Laing NG. Variants in ACTG2 underlie a substantial number of Australasian patients with primary chronic intestinal pseudo-obstruction. Neurogastroenterol Motil 2018; 30:e13371. [PMID: 29781137 DOI: 10.1111/nmo.13371] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 04/09/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND Primary chronic intestinal pseudo-obstruction (CIPO) is a rare, potentially life-threatening disorder characterized by severely impaired gastrointestinal motility. The objective of this study was to examine the contribution of ACTG2, LMOD1, MYH11, and MYLK mutations in an Australasian cohort of patients with a diagnosis of primary CIPO associated with visceral myopathy. METHODS Pediatric and adult patients with primary CIPO and suspected visceral myopathy were recruited from across Australia and New Zealand. Sanger sequencing of the genes encoding enteric gamma-actin (ACTG2) and smooth muscle leiomodin (LMOD1) was performed on DNA from patients, and their relatives, where available. MYH11 and MYLK were screened by next-generation sequencing. KEY RESULTS We identified heterozygous missense variants in ACTG2 in 7 of 17 families (~41%) diagnosed with CIPO and its associated conditions. We also identified a previously unpublished missense mutation (c.443C>T, p.Arg148Leu) in one family. One case presented with megacystis-microcolon-intestinal hypoperistalsis syndrome in utero with subsequent termination of pregnancy at 28 weeks' gestation. All of the substitutions identified occurred at arginine residues. No likely pathogenic variants in LMOD1, MYH11, or MYLK were identified within our cohort. CONCLUSIONS AND INFERENCES ACTG2 mutations represent a significant underlying cause of primary CIPO with visceral myopathy and associated phenotypes in Australasian patients. Thus, ACTG2 sequencing should be considered in cases presenting with hypoperistalsis phenotypes with suspected visceral myopathy. It is likely that variants in other genes encoding enteric smooth muscle contractile proteins will contribute further to the genetic heterogeneity of hypoperistalsis phenotypes.
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Affiliation(s)
- G Ravenscroft
- Harry Perkins Institute of Medical Research, University of Western Australia, Nedlands, WA, Australia
| | - S Pannell
- Harry Perkins Institute of Medical Research, University of Western Australia, Nedlands, WA, Australia
| | - G O'Grady
- Department of Surgery, University of Auckland, Auckland, New Zealand
| | - R Ong
- Harry Perkins Institute of Medical Research, University of Western Australia, Nedlands, WA, Australia
| | - H C Ee
- Department of Gastroenterology, Sir Charles Gairdner Hospital, Nedlands, WA, Australia
| | - F Faiz
- PathWest Diagnostic Genomics, QE II Medical Centre, Nedlands, WA, Australia
| | - L Marns
- PathWest Diagnostic Genomics, QE II Medical Centre, Nedlands, WA, Australia
| | - H Goel
- Hunter Genetics, Waratah, NSW, Australia
| | - P Kumarasinghe
- Faculty of Medicine and Health Sciences, University of Western Australia, Nedlands, WA, Australia
| | - E Sollis
- Harry Perkins Institute of Medical Research, University of Western Australia, Nedlands, WA, Australia
| | - P Sivadorai
- PathWest Diagnostic Genomics, QE II Medical Centre, Nedlands, WA, Australia
| | - M Wilson
- Department of Clinical Genetics, Children's Hospital at Westmead, Sydney, NSW, Australia
| | - A Magoffin
- Department of Gastroenterology, The Children's Hospital at Westmead, Westmead, NSW, Australia
| | - S Nightingale
- Paediatric Gastroenterology, John Hunter Children's Hospital, Newcastle, NSW, Australia
| | - M-L Freckmann
- ACT Genetics, The Canberra Hospital, Woden, ACT, Australia
| | - E P Kirk
- Centre for Clinical Genetics, Sydney Children's Hospital, Randwick, NSW, Australia
| | - R Sachdev
- Centre for Clinical Genetics, Sydney Children's Hospital, Randwick, NSW, Australia
| | - D A Lemberg
- Department of Paediatric Gastroenterology, Sydney Children's Hospital, Women's and Children's Health, University of New South Wales, Randwick, NSW, Australia
| | - M B Delatycki
- Victorian Clinical Genetics Services, Murdoch Children's Research Institute, Department of Paediatrics, University of Melbourne, Melbourne, Vic., Australia
| | - M A Kamm
- Department of Gastroenterology, St Vincent's Hospital and University of Melbourne, Melbourne, Vic., Australia
| | - C Basnayake
- Department of Gastroenterology, St Vincent's Hospital and University of Melbourne, Melbourne, Vic., Australia
| | - P J Lamont
- Harry Perkins Institute of Medical Research, University of Western Australia, Nedlands, WA, Australia
| | - D J Amor
- Murdoch Children's Research Institute, Department of Paediatrics, University of Melbourne, Melbourne, Vic., Australia
| | - K Jones
- Faculty of Medicine and Health Sciences, University of Western Australia, Nedlands, WA, Australia
| | - J Schilperoort
- Faculty of Medicine and Health Sciences, University of Western Australia, Nedlands, WA, Australia
| | - M R Davis
- PathWest Diagnostic Genomics, QE II Medical Centre, Nedlands, WA, Australia
| | - N G Laing
- Harry Perkins Institute of Medical Research, University of Western Australia, Nedlands, WA, Australia.,PathWest Diagnostic Genomics, QE II Medical Centre, Nedlands, WA, Australia
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Gooding R, Colomer J, King R, Angelicheva D, Marns L, Parman Y, Chandler D, Bertranpetit J, Kalaydjieva L. A novel Gypsy founder mutation, p.Arg1109X in the CMT4C gene, causes variable peripheral neuropathy phenotypes. J Med Genet 2006; 42:e69. [PMID: 16326826 PMCID: PMC1735969 DOI: 10.1136/jmg.2005.034132] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
BACKGROUND Linkage, haplotype and sequencing analysis in a large Spanish Gypsy kindred with multiple members affected by autosomal recessive peripheral neuropathy led to the identification of a novel mutation, p.Arg1109X, in the CMT4C gene. The screening of further unrelated patients, and of a panel of ethnically matched controls, showed that p.Arg1109X is an ancestral mutation which occurs in Gypsy populations across Europe and is the most common cause of autosomal recessive Charcot-Marie-Tooth disease in Spanish Gypsies. OBJECTIVE To report the identification of a novel Gypsy founder mutation causing autosomal recessive CMT4C disease in a sample of homozygous affected individuals. RESULTS The mutation was associated with a surprisingly broad spectrum of neuropathy phenotypes, with variation in the age at onset, rate of progression, severity of muscle and sensory involvement, the presence of scoliosis, and cranial nerve involvement. CONCLUSIONS Ascertainment and further studies of CMT4C patients in this population will provide a unique opportunity for characterising the full range of clinical manifestations of the disease in a genetically homogeneous sample.
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Affiliation(s)
- R Gooding
- Laboratory for Molecular Genetics, Western Australian Institute for Medical Research, Centre for Medical Research, The University of Western Australia, Perth, Australia
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