Hypertension in the spontaneously hypertensive rat is linked to the Y chromosome.
The objective of our study was to determine the genetic influence on blood pressure in spontaneously hypertensive rats (SHR), and normotensive Wistar-Kyoto (WKY) rats using genetic crosses. Blood pressure was measured by tail sphygmomanometry from 8 to 20 weeks of age. Blood pressure was significantly higher from 12 to 20 weeks in the male offspring derived from WKY mothers x SHR fathers as compared with male offspring derived from SHR mothers X WKY fathers (180 +/- 4 versus 160 +/- 5 mm Hg, p less than 0.01). There was no significant difference between the blood pressure of the F1 females, further supporting Y chromosome linkage and not parental imprinting. The blood pressure data from F2 males derived from reciprocal crosses of parental strains were consistent with the presence of a Y-linked locus, but not with an X-linked locus controlling blood pressure. The data strongly suggest that hypertension in the SHR has two primary components of equal magnitude, one consisting of a small number of autosomal loci with a second Y-linked component.
Department of Biology, University of Akron, Ohio 44325.
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D000818:Animals; D001794:Blood Pressure; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005260:Female; D006973:Hypertension / Q000235:genetics*; D008297:Male; D051381:Rats; D011918:Rats, Inbred SHR; D011921:Rats, Inbred WKY; D014998:Y Chromosome