BabyScreen+ newborn screening

Gene: MYH11

I don't know

Assessed as 'strong actionability' in paediatric patients by ClinGen.

FTAAD is a rare genetic vascular disease characterized by the familial occurrence of thoracic aortic aneurysm, dissection, or dilatation affecting one or more aortic segments (aortic root, ascending aorta, arch, or descending aorta).

Variable age of clinical presentation.

Prophylactic surgical repair of the aorta is recommended at 4.5-5.0 cm for patients with pathogenic variants in MYH11, SMAD3, and ACTA2 and at 4.0-4.5 cm for patients with pathogenic variants in TGFBR1 or TGFBR2.

Beta adrenergic-blocking agents are recommended to reduce aortic dilation. Losartan was added as an alternative to beta adrenergic-blocking agents in FTAAD after studies showed its efficacy in children and young adults with MFS who were randomly assigned to losartan or atenolol.

Penetrance: A study of 12 individuals with MYH11 pathogenic variants indicated that 34% had an aortic dissection and one individual (8%) underwent prophylactic aortic aneurysm repair.

Reviewed with a paediatric cardiologist: variable penetrance and age of onset, does not meet criteria for gNBS.

Created: 30 Dec 2022, 2:09 a.m. | Last Modified: 29 Mar 2023, 1:33 a.m.

Panel Version: 0.2130

Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted

Phenotypes
Aortic aneurysm, familial thoracic 4, MIM#160745