Mapping Data

Experiment

• Experiment
  TEXT-QTL-Candidate Genes
• Chromosome
  2
• Reference
  J:99482 Fehr C, et al., The syntaxin binding protein 1 gene (Stxbp1) is a candidate for an ethanol preference drinking locus on mouse chromosome 2. Alcohol Clin Exp Res. 2005 May;29(5):708-20
• ID
  MGI:3589636

Genes

Gene	Assay Type
Alcp1	reported elsewhere
Ap2q	reported elsewhere
Etohc1	reported elsewhere
Etohc2	reported elsewhere
Stxbp1	reported elsewhere

Notes

• Experiment
  Several alcohol preference QTL map to proximal mouse Chromosome 2 including Alcp1 (47.5 cM), Ap2q (34 cM), Etohc1 (28 cM), and Etohc2 (50 cM). This study investigates Stxbp1 as a candidate gene for the chromosome 2 alcohol-associated locus.
  
  Alcohol preferring inbred strain C57BL/6J and alcohol avoiding inbred strain DBA/2J differ at nucleotide 646 of the Stxbp1 sequence. G646A is a non-conservative change in the Stxbp1 coding sequence resulting in the absence of a turn/turn motif in the C57BL/6J allele.
  
  Analysis of 23 BXD RI strains shows correlation of the Stxbp1 polymorphism to alcohol consumption, acute alcohol withdrawal severity, and alcohol-induced conditioned taste aversion. This observation was confirmed in 3 other experiments.
  
  1) Stxbp1 genotype was established for 86 (C57BL/6J x DBA/2J)F2 animals. F2 homozygotes for C57BL/6J-derived Stxbp1 alleles display 2X increased alcohol consumption compared to heterozygotes, and 3.5X increased alcohol consumption compared to F2 DBA/2J homozygotes (P=0.001).The effect of the C57BL/6J-derived Stxbp1 allele appears to be additive.
  
  2) Fourth generation phenotype-selection lines derived from C57BL/6J and DBA/2J progenitors were assessed for allele frequencies at Stxbp1. The low alcohol preferring selection line STDRLO showed significant enrichment for DBA/2J-derived Stxbp1 alleles compared to the high alcohol preferring selection line STDRHI (P<0.0001).
  
  3) Stxbp1 genotype and alcohol consumption was analyzed in 15 inbred strains. Ten inbred strains carrying C57BL/6J-like Stxbp1 allele tend to consume more alcohol compared to the five inbred strains carrying DBA/2J-like Stxbp1 alleles. The difference in alcohol consumption did not reach statistical significant but supports the hypothesis that Stxbp1 is a candidate gene for alcohol preference traits.