Prevalence of aortic root dilation in the Ehlers-Danlos syndrome.
ABSTRACT To determine the prevalence of proximal aortic abnormalities in patients with Ehlers-Danlos syndrome (EDS).
In a prospective cohort study, aortic measurements by two-dimensional echocardiography were performed on consecutive EDS patients.
Twenty-eight percent (20 of 71) had aortic root dilation (ARD) (> +2 SD above population based norms). Fourteen of 42 individuals with the classical form of EDS (types I/II) and 6 of 29 individuals with the hypermobile form (type III) had ARD, with no gender differences.
ARD is a common finding in EDS. Longitudinal studies are indicated to determine progression of ARD and its clinical significance.
- [show abstract] [hide abstract]
ABSTRACT: COL5A1, the gene for the alpha 1 chain of type V collagen, has been considered a candidate gene for certain diseases based on chromosomal location and/or disease phenotype. We have employed 3'-untranslated region RFLPs to exclude COL5A1 as a candidate gene in families with tuberous sclerosis 1, Ehlers-Danlos syndrome type II, and nail-patella syndrome. In addition, we describe a polymorphic simple sequence repeat (SSR) within a COL5A1 intron. This SSR is used to exclude COL5A1 as a candidate gene in hereditary hemorrhagic telangiectasia (Osler-Rendu-Weber disease) and to add COL5A1 to the existing map of "index" markers of chromosome 9 by evaluation of the COL5A1 locus on the CEPH 40-family reference pedigree set. This genetic mapping places COL5A1 between markers D9S66 and D9S67.Genomics 03/1995; 25(3):737-9. · 3.01 Impact Factor
- [show abstract] [hide abstract]
ABSTRACT: Ehlers-Danlos syndrome (EDS) is a heterogeneous group of connective-tissue disorders characterized by skin fragility, joint laxity, and skeletal deformities. Type V collagen appears to have a causal role in EDS types I and II, which show phenotypic overlap and may sometimes be allelic. Type V collagen can exist as a heterotrimer, [alpha1(V)]2alpha2(V), and it both coassembles with and regulates type I collagen-fibril diameter. Using an intragenic COL5A1 polymorphism, we have demonstrated linkage, at zero recombination, to the same allele in two large British EDS type II families (LOD scores 4.1 and 4.3). Affected members from each family were heterozygous for a point mutation in intron 32 (IVS32:T-25G), causing the 45-bp exon 33 to be lost from the mRNA in approximately 60% of transcripts from the mutant gene. This mutation lies only 2 bp upstream of a highly conserved adenosine in the consensus branch-site sequence, which is required for lariat formation. Although both families shared the same marker allele, we have been unable to identify a common genealogy. This is the first description of a mutation at the lariat branch site, which plays a pivotal role in the splicing mechanism, in a collagen gene. Very probably, the resulting in-frame exon skip has a dominant-negative effect due to incorporation of the mutant proalpha chain into the triple-helical molecule. These findings further confirm the importance of type V collagen in the causation of EDS type II, and the novel collagen mutation indicates the importance of the lariat branch site in splicing.The American Journal of Human Genetics 09/1998; 63(2):390-8. · 11.20 Impact Factor
- New England Journal of Medicine 08/1994; 331(2):132-3. · 51.66 Impact Factor