MONDO_0971179 (arterial tortuosity-bone fragility syndrome) is a syndromic disease with a spectrum of manifestations in the cardiovascular system and other organ systems caused by disease-causing variants in the EMILIN1 gene, inherited in an autosomal recessive manner. Affected individuals have impaired elastogenesis with defective collagen fibrillogenesis which can lead to arterial tortuosity, bone fragility and other manifestations including dysmorphic facial features, cutis laxa, joint hypermobility, congenital heart malformations, arterial stenosis, and aortic root dilatation. Cases may present prenatally or in early childhood. Also known as: EMILIN1-related arterial tortuosity syndrome.