RGD Reference Report - Genetically defined risk of salt sensitivity in an intercross of Brown Norway and Dahl S rats. - Rat Genome Database

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Genetically defined risk of salt sensitivity in an intercross of Brown Norway and Dahl S rats.

Authors: Cowley AW, JR  Stoll, M  Greene, AS  Kaldunski, ML  Roman, RJ  Tonellato, PJ  Schork, NJ  Dumas, P  Jacob, HJ 
Citation: Cowley AW Jr, etal., Physiol Genomics 2000 Apr 27;2(3):107-15.
RGD ID: 69700
Pubmed: PMID:11015589   (View Abstract at PubMed)

A genetic segregation analysis was performed to identify genes that cosegregate with arterial blood pressure traits reflective of salt sensitivity. A population of 113 F2 male rats was derived from an intercross of inbred SS/JrHsd/Mcw (Dahl salt-sensitive) and BN/SsN/Mcw (Brown Norway) rats. Rats were maintained on an 8% salt diet from the age of 9 to 13 wk, and arterial pressure was measured for 3 h daily during the 4th wk of high salt intake in unanesthetized rats using implanted arterial catheters. At the end of the 3rd day of high-salt pressure recordings, the arterial pressure response to salt depletion was determined 1.5 days following treatment with Lasix and a low-sodium (0. 4%) diet. A genome-wide scan using 265 polymorphic simple sequence length polymorphism (SSLP) markers found that seven arterial pressure phenotypes determined at different times and circumstances, and representing two distinct indexes of salt sensitivity, mapped to the same region of rat chromosome 18. The trait of salt sensitivity was strongly influenced by the presence of SS alleles in this region of chromosome 18, and those rats which were homozygote SS/SS exhibited a significantly greater reduction of mean arterial pressure following sodium depletion (29 +/- 2 mmHg) than homozygote BN/BN (17 +/- 3 mmHg) or heterozygotic (22 +/- 2 mmHg) rats. This region of rat chromosome 18 corresponds to the long arm of human chromosome 5 and a region of human chromosome 18 that has been linked to hypertension in humans. Given the unlikely chance of these different blood pressure traits mapping to the same region, we believe these data provide evidence that this region of rat chromosome 18 plays an important role in salt-induced hypertension.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
hypertension  IAGP 69700; 69700; 69700; 69700; 69700; 69700; 69700 RGD 

Phenotype Annotations    Click to see Annotation Detail View

Mammalian Phenotype


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Objects Annotated

QTLs
Bp349  (Blood pressure QTL 349)
Bp350  (Blood pressure QTL 350)
Bp351  (Blood pressure QTL 351)
Bp352  (Blood pressure QTL 352)
Bp353  (Blood pressure QTL 353)
Bp354  (Blood pressure QTL 354)
Bp355  (Blood pressure QTL 355)

Strains
BN/NHsdMcwi  (NA)
SS/JrHsdMcwi  (NA)


Additional Information