Quantitative trait loci affecting ethanol sensitivity in BXD recombinant inbred mice

Area of Science:

• Neurogenetics
• Behavioral Genetics
• Pharmacogenetics

Background:

• Ethanol sensitivity is influenced by both genetic and environmental factors.
• Identifying specific genes involved in ethanol's effects is crucial for understanding its impact.
• Quantitative trait locus (QTL) mapping is a key method for discovering genes related to complex behaviors.

Purpose of the Study:

• To identify genes associated with ethanol sensitivity using QTL mapping.
• To investigate the genetic underpinnings of ethanol-induced behaviors like ataxia and loss of righting reflex.

Main Methods:

• A QTL analysis was performed on 25 BXD recombinant inbred (RI) mouse strains and their progenitors (C57BL/6J and DBA/2J).
• Ethanol-induced loss of righting reflex duration and blood ethanol concentration were measured.
• Ethanol-induced ataxia was assessed by measuring the latency to fall from a vertical screen.

Main Results:

• Genome-wide QTL analyses revealed significant associations (p <= 0.01) between genetic markers and ethanol sensitivity.
• Provisional QTLs were identified on multiple chromosomes, excluding chromosomes 2, 5, 12, 13, and X.
• Several identified QTLs are located near genes that are potential candidates for mediating ethanol's effects.

Conclusions:

• Ethanol sensitivity is likely determined by the combined action of multiple genes.
• The study provides provisional chromosomal locations for genes influencing ethanol sensitivity.
• Further studies using additional genetically segregating populations are needed to confirm these QTL linkages.