Narrowing a region on rat chromosome 13 that protects against hypertension in Dahl SS-13BN congenic strains. Am J Physiol Heart Circ Physiol 2011 Apr;300(4):H1530-5
Date
01/25/2011Pubmed ID
21257920Pubmed Central ID
PMC3075031DOI
10.1152/ajpheart.01026.2010Scopus ID
2-s2.0-79955067680 (requires institutional sign-in at Scopus site) 27 CitationsAbstract
Transfer of chromosome 13 from the Brown Norway (BN) rat onto the Dahl salt-sensitive (SS) genetic background attenuates the development of hypertension, but the genes involved remain to be identified. The purpose of the present study was to confirm by telemetry that a congenic strain [SS.BN-(D13Hmgc37-D13Got22)/Mcwi, line 5], carrying a 13.4-Mb segment of BN chromosome 13 from position 32.4 to 45.8 Mb, is protected from the development of hypertension and then to narrow the region of interest by creating and phenotyping 11 additional subcongenic strains. Mean arterial pressure (MAP) rose from 118 ± 1 to 186 ± 5 mmHg in SS rats fed a high-salt diet (8.0% NaCl) for 3 wk. Protein excretion increased from 56 ± 11 to 365 ± 37 mg/day. In contrast, MAP only increased to 152 ± 9 mmHg in the line 5 congenic strain. Six subcongenic strains carrying segments of BN chromosome 13 from 32.4 and 38.2 Mb and from 39.9 to 45.8 Mb were not protected from the development of hypertension. In contrast, MAP was reduced by ∼30 mmHg in five strains, carrying a 1.9-Mb common segment of BN chromosome 13 from 38.5 to 40.4 Mb. Proteinuria was reduced by ∼50% in these strains. Sequencing studies did not identify any nonsynonymous single nucleotide polymorphisms in the coding region of the genes in this region. RT-PCR studies indicated that 4 of the 13 genes in this region were differentially expressed in the kidney of two subcongenic strains that were partially protected from hypertension vs. those that were not. These results narrow the region of interest on chromosome 13 from 13.4 Mb (159 genes) to a 1.9-Mb segment containing only 13 genes, of which 4 are differentially expressed in strains partially protected from the development of hypertension.
Author List
Moreno C, Williams JM, Lu L, Liang M, Lazar J, Jacob HJ, Cowley AW Jr, Roman RJAuthor
Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsAnimals, Congenic
Base Sequence
Chromosomes, Mammalian
Genetic Loci
Hypertension
Kidney
Male
Molecular Sequence Data
Polymorphism, Single Nucleotide
Proteinuria
Rats
Rats, Inbred Dahl
Sodium Chloride, Dietary
