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Genetic determinants on rat chromosome 6 modulate variation in the hypercapnic ventilatory response using consomic strains. J Appl Physiol (1985) 2005 May;98(5):1630-8 PMID: 15661838

Pubmed ID



To understand the genetic basis of pathways involved in the control of breathing, a large scale, high-throughput study using chromosomal substitution strains of rats is underway. Eight new consomic rat stains (SS-2(BN), SS-4(BN), SS-6(BN), SS-7(BN), SS-8(BN), SS-11(BN), SS-12(BN), SS-14(BN), SS-Y(BN)), containing one homozygous BN/NHsdMcwi (BN) chromosome on a background of SS/JrHsdMcwi (SS), were created by PhysGen ( Program for Genomic Applications. Male and female rats were studied using standard plethysmography under control conditions and during acute hypoxia (inspired oxygen fraction = 0.12) and hypercapnia (inspired CO(2) fraction = 0.07). The rats were also studied during treadmill exercise. Both male and female BN rats had a significantly lower ventilatory response during 7% CO(2) compared with SS rats of the same gender. SS-6(BN) female rats had a significantly reduced ventilatory response, similar to BN rats due primarily to a reduced tidal volume. Male SS-6(BN) rats had a significantly reduced tidal volume response to hypercapnia but a slightly increased frequency response during hypercapnia. Gene(s) on the Y chromosome may play a role in this increased frequency response in the male rats because the SS-Y(BN) hypercapnic ventilatory response involves a significantly increased frequency response. Several chromosomal substitutions slightly altered the ventilatory responses to hypoxia and exercise. However, genes on chromosomes 6 and Y of those studied are of primary importance in aspects of ventilatory control currently studied.

Author List

Dwinell MR, Forster HV, Petersen J, Rider A, Kunert MP, Cowley AW Jr, Jacob HJ


Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of Wisconsin
Melinda R. Dwinell PhD Center Associate Director, Associate Professor in the Physiology department at Medical College of Wisconsin
Hubert V. Forster PhD Professor in the Physiology department at Medical College of Wisconsin


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MESH terms used to index this publication - Major topics in bold

Blood Pressure
Chromosome Mapping
Genetic Markers
Genetic Variation
Heart Rate
Pulmonary Ventilation
Species Specificity
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