Cited by 184Connective tissue disorders researchDermatological and Skeletal DisordersGenomics and Rare Diseases

Haploinsufficiency for one COL3A1 allele of type III procollagen results in a phenotype similar to the vascular form of Ehlers-Danlos syndrome, Ehlers-Danlos syndrome type IV

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Schwarze, Ulrike, Schievink, Wouter I., Petty, Elizabeth, Jaff, Michael R., Babovic-Vuksanovic, Dusica, Cherry, Kenneth J., Pepin, Melanie, Byers, Peter H.·2001·The American Journal of Human Genetics

Abstract

Mutations in the COL3A1 gene that encodes the chains of type III procollagen result in the vascular form of Ehlers-Danlos syndrome (EDS), EDS type IV, if they alter the sequence in the triple-helical domain. Although other fibrillar collagen-gene mutations that lead to allele instability or failure to incorporate proalpha-chains into trimers-and that thus reduce the amount of mature molecules produced-result in clinically apparent phenotypes, no such mutations have been identified in COL3A1. Furthermore, mice heterozygous for Col3a1 "null" alleles have no identified phenotype. We have now found three frameshift mutations (1832delAA, 413delC, and 555delT) that lead to premature termination codons (PTCs) in exons 27, 6, and 9, respectively, and to allele-product instability. The mRNA from each mutant allele was transcribed efficiently but rapidly degraded, presumably by the mechanisms of nonsense-mediated decay. In a fourth patient, we identified a point mutation, in the final exon, that resulted in a PTC (4294C-->T [Arg1432Ter]). In this last instance, the mRNA was stable but led to synthesis of a truncated protein that was not incorporated into mature type III procollagen molecules. In all probands, the presenting feature was vascular aneurysm or rupture. Thus, in contrast to mutations in genes that encode the dominant protein of a tissue (e.g., COL1A1 and COL2A1), in which "null" mutations result in phenotypes milder than those caused by mutations that alter protein sequence, the phenotypes produced by these mutations in COL3A1 overlap with those of the vascular form of EDS. This suggests that the major effect of many of these dominant mutations in the "minor" collagen genes may be expressed through protein deficiency rather than through incorporation of structurally altered molecules into fibrils.

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  1. Byers PH, Schwarze U. Ehlers-Danlos syndrome. In: Rimoin DL, Connor JM, Pyeritz RE (eds) Emery and Rimoin's principles and practice of medical genetics. Harcourt, London (in press)

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Authors
Schwarze, U., Schievink, W. I., Petty, E., Jaff, M. R., Babovic-Vuksanovic, D., Cherry, K. J., Pepin, M., & Byers, P. H.
Affiliations
  • University of Washington (US)
  • Cedars-Sinai Medical Center (US)
  • University of Michigan (US)
  • Morristown Medical Center (US)
  • Mayo Clinic (US)
Corresponding author
Byers, Peter H.
Venue
The American Journal of Human Genetics
Publisher
Elsevier BV
Published
2001-11
Volume
69
Issue
5
Pages
989-1001
ISSN
0002-9297 (ISSN-L)
OpenAlex
W1983040466
Cited by
184
References
50
Citations by year
2026: 2 · 2025: 10 · 2024: 4 · 2023: 10 · 2022: 9 · 2021: 9 · 2020: 15 · 2019: 11 · 2018: 7 · 2017: 7 · 2016: 2 · 2015: 9 · 2014: 6 · 2013: 7 · 2012: 8
FWCI
2.55
Type
journal article
Language
en
Open access
Locations
  • The American Journal of Human Genetics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR-21557, P01AR021557)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Connective tissue disorders research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Dermatological and Skeletal Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genomics and Rare Diseases
Keywords
COL3A1, type III procollagen, haploinsufficiency, Ehlers-Danlos syndrome type IV, vascular Ehlers-Danlos syndrome, frameshift mutation, premature stop codon, nonsense-mediated mRNA decay, mRNA degradation, vascular aneurysm, collagen mutations, protein deficiency
MeSH terms
Alleles, Base Sequence, Cell Nucleus, Cells, Cultured, Collagen, Cytoplasm, DNA Mutational Analysis, Ehlers-Danlos Syndrome, Exons, Fibroblasts, Genes, Dominant, Heterozygote, Humans, Molecular Sequence Data, Mutation, Phenotype, Polymorphism, Genetic, Procollagen, RNA Precursors, RNA, Messenger, Blotting, Western, Frameshift Mutation, Codon, Nonsense, Protein Structure, Quaternary, RNA Stability, Collagen Type III

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