Genetic analysis of the hypothalamic corticotropin-releasing factor system.
The goal of this study was to use BxD recombinant inbred mice to search for genes that control the hypothalamic corticotrophin-releasing factor (CRF) system. The specific phenotype that was measured was abundance of transcripts that encode CRF, CRF receptor (Crf-R1), CRF binding protein, and arginine vasopressin (AVP) in total hypothalamic RNA. The strain distribution patterns for the transcript abundances for each target were continuously distributed, consistent with these being quantitative traits. Marker regression and interval mapping revealed associations with quantitative trait loci (QTL) for CRF transcript abundance on chromosome 1 (at 89.2 cM), chromosome 12 (between 54-58 cM), and chromosome 13 (between 26-30 cM); for Crf-R1 transcript abundance on chromosome 7 (at 1.5 cM), chromosome 12 (at 37 cM), and chromosome X (at 30 cM); for CRF binding protein transcript abundance on chromosome 7 (at 48.5 cM), chromosome 8 (at 65 cM), and chromosome 12 (at 19 cM); and for AVP transcript abundance on chromosome 7 (at 1 cM), chromosome 12 (at 13 cM), and chromosome 13 (at 45 cM). The transcript abundance QTL were not linked to their respective structural genes. Interval mapping on chromosome 7 reveals substantial overlap between QTL that control AVP and Crf-R1 transcript abundance and on chromosome 12 for QTL that control CRF and Crf-R1, which may indicate loci that coordinate regulation of the CRF system. There are QTL for all four targets on chromosome 12. There are a number of neurodevelopmental genes in very close proximity to the transcript abundance QTL that are potential candidate genes.
Garlow
Steven J
SJ
Mood and Anxiety Disorders Program, Department of Psychiatry and Behavioral Science, Emory University School of Medicine, Atlanta, Georgia 30322, USA. sgarlow@emory.edu
Boone
Ericka
E
Li
Wei
W
Owens
Michael J
MJ
Nemeroff
Charles B
CB
D000818:Animals; D001127:Arginine Vasopressin / Q000235:genetics; D002352:Carrier Proteins / Q000235:genetics; D002874:Chromosome Mapping; D003346:Corticotropin-Releasing Hormone / Q000235:genetics*; D007031:Hypothalamus / Q000737:chemistry*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008822:Mice, Transgenic; D040641:Quantitative Trait Loci / Q000235:genetics; D012333:RNA, Messenger / Q000032:analysis; D018019:Receptors, Corticotropin-Releasing Hormone / Q000235:genetics
D002352:Carrier Proteins; D012333:RNA, Messenger; D018019:Receptors, Corticotropin-Releasing Hormone; D001127:Arginine Vasopressin; C067133:corticotropin releasing factor-binding protein; D003346:Corticotropin-Releasing Hormone