Role of genetic factors in the etiopathogenesis of cerebrovascular accidents: from an animal model to the human disease.

1. The present work summarizes current knowledge on the genetic susceptibility to stroke, a complex cardiovascular phenotypic trait due to both gene/environment and gene/ gene interactions. 2. Evidence for the existence of genes directly contributing to stroke occurrence was first obtained in the animal model of the stroke-prone (sp) spontaneously hypertensive rat (SHR) through a linkage analysis approach in F2 segregating hybrid populations. In fact, several Quantitative Trait Loci (QTLs) were detected in different chromosomes of the rat. Candidate genes were identified (ANP, BNP, Adrenomedullin) and subsequently analyzed to obtain information on the fine disease mechanisms possibly dependent from specific sequence mutations. 3. The most important achievement was represented by the fact that the gene encoding ANP appeared to play a role in the disease of both rats and humans, thus providing a suggestive parallelism between the animal model and the human cerebrovascular disease. A more extensive analysis is required to identify the potential pathogenic role of genetic factors involved in human stroke.