Human Molecular Genetics, 2003, Vol. 12, Review Issue 1 R97-R112
DOI: 10.1093/hmg/ddg103
© 2003 Oxford University Press
Vascular morphogenesis: tales of two syndromes
Department of Molecular Genetics and Microbiology, Duke University Medical Center, Box 3175, Durham, NC 27710, USA
Received January 31, 2003; Accepted February 14, 2003
Advances in our understanding of fundamental biological processes can be made by the analysis of defects manifested in inherited diseases. The genes responsible for these genetic syndromes often encode proteins that act at critical points of the pathways that control biological processes such as cell proliferation, cell–cell communication, cellular differentiation, and cell death. This approach has lead to the discovery of novel gene products and/or biochemical pathways involved in disease, genes that in turn play a fundamental role in normal biological processes. This forward genetic approach, focusing on Mendelian disorders of vascular anomalies, has been particularly fruitful for the study of genetic regulation of angiogenesis. This review summarizes the ongoing saga of two genetic syndromes involving disruption of normal vascular morphogenesis. Each inherited disorder involves the focal development of a distinct vascular anomaly. In hereditary hemorrhagic telangiectasia (HHT), the hallmark vascular lesion is termed an arteriovenous malformation, which involves the direct communication of an artery with a vein (arteriovenous shunt), without an intervening capillary bed. For cerebral cavernous malformations (CCM), the lesions are grossly-dilated, closely-packed, capillary-like sinusoidal chambers. The autosomal dominant mode of inheritance of each of these distinct syndromes suggested that the underlying genes might regulate critical aspects of vascular morphogenesis. Emerging but intriguing tales are being told by the genes (and their protein products) mutated in these disorders.
* To whom correspondence should be addressed. Email: march004{at}mc.duke.edu
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