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Redin C, Pavlidou DC, Bhuiyan Z, Porretta AP, Monney P, Bedoni N, Maurer F, Sekarski N, Atallah I, Émeline D, Jeanrenaud X, Pruvot E, Fellay J, Superti-Furga A. The «Amish» NM_000256.3:c.3330+2T>G splice variant in MYBPC3 associated with hypertrophic cardiomyopathy is an ancient Swiss mutation. Eur J Med Genet 2022; 65:104627. [PMID: 36162733 DOI: 10.1016/j.ejmg.2022.104627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 07/05/2022] [Accepted: 09/19/2022] [Indexed: 11/03/2022]
Abstract
MYBPC3 is the most frequently mutated gene in hypertrophic cardiomyopathy (HCM). Several loss-of-function founder variants have been reported in MYBPC3 from various geographic regions, altogether suggestive of a modest or absent effect of these variants on reproductive fitness. One of them, a MYBPC3 splice variant, NM_000256.3:c.3330+2T > G, was first described in homozygous state in newborns presenting with a severe, recessive form of HCM among the Amish population and was later associated with adult-onset dominant HCM in heterozygous carriers. We here report this splice variant in heterozygous state in eight unrelated Swiss families with HCM, making it the most prevalent cardiomyopathy variant in western Switzerland. This variant was identified in patients using targeted (n = 5) or full-genome sequencing (n = 3). Given the prevalence of this variant in the Old Order Amish, Mennonites and Swiss populations, and given that both Amish and Mennonites founders originated from the Bern Canton in Switzerland, the MYBPC3, NM_000256.3:c.3330+2T > G variant appears to be of Swiss origin. Neighboring regions that hosted the first Amish settlements (Alsace, South Germany) should be on the lookout for that variant. The existence of MYBPC3 founder variants in different populations suggests that individuals with early-onset clinical disease may be the tip of the iceberg of a much larger number of asymptomatic carriers. Alternatively, reproductive fitness could even be slightly increased in some variant carriers to compensate for the reduction of fitness in the more severely affected ones, but this remains to be investigated.
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Affiliation(s)
- Claire Redin
- Precision Medicine Unit, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland.
| | - Despina Christina Pavlidou
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland
| | - Zahurul Bhuiyan
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland
| | - Alessandra Pia Porretta
- Service of Cardiology, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; Department of Clinical-Surgical Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | - Pierre Monney
- University of Lausanne, Lausanne, 1011, Switzerland; Service of Cardiology, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland
| | - Nicola Bedoni
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland
| | - Fabienne Maurer
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland
| | - Nicole Sekarski
- Pediatric Cardiology, Women-Mother-Child Department, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland
| | - Isis Atallah
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland
| | - Davoine Émeline
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland
| | - Xavier Jeanrenaud
- Service of Cardiology, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland
| | - Etienne Pruvot
- Service of Cardiology, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland
| | - Jacques Fellay
- Precision Medicine Unit, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland
| | - Andrea Superti-Furga
- Division of Genetic Medicine, Lausanne University Hospital (CHUV), Lausanne, 1011, Switzerland; University of Lausanne, Lausanne, 1011, Switzerland.
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