Lack of association of a spontaneous mutation of the Chrm2 gene with behavioral and physiologic phenotypic differences in inbred mice.
The nucleotide substitution C797T in the Chrm2 gene causes substitution of leucine for proline at position 266 (P266L) of the CHRM2 protein. Because Chrm2 codes for the type 2 muscarinic receptor, this mutation could influence physiologic and behavioral phenotypes of mice. Chrm2 mRNA was not differentially expressed in 2 brain regions with high cholinergic innervation in a mouse strain that does (BALB/cByJ) or does not (C57BL/6J) have the mutation. In addition, strains of mice with and without the C797T point mutation in Chrm2 did not differ significantly in muscarinic binding properties. Variation across strains was detected in terms of acoustic startle, prepulse inhibition, and the physiologic effects of the muscarinic agonist oxotremorine. However, interstrain differences in these measures did not correlate with the presence of the mutation. Although we were unable to associate a measurable phenotype with the Chrm2 mutation, assessment of the mutation on other genetic backgrounds or in the context of other traits might reveal differential effects. Therefore, despite our negative findings, evaluation of characteristics that involve muscarinic function should be undertaken with caution when comparing mice with different alleles of the Chrm2 gene.
Ding
Ming
M
Department of Pharmacology, Southern Illinois University School of Medicine, Springfield, IL, USA.
Arnold
Jennifer
J
Turner
Jeremy
J
Ramkumar
Vickram
V
Hughes
Larry F
LF
Trammell
Rita A
RA
Toth
Linda A
LA
D000483:Alleles; D000595:Amino Acid Sequence; D000704:Analysis of Variance; D000818:Animals; D001483:Base Sequence; D001522:Behavior, Animal / Q000502:physiology*; D001667:Binding, Competitive / Q000235:genetics; D001831:Body Temperature / Q000187:drug effects; D001921:Brain / Q000378:metabolism; D017931:DNA Primers / Q000235:genetics; D006339:Heart Rate / Q000187:drug effects; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D020125:Mutation, Missense / Q000235:genetics*; D010095:Oxotremorine / Q000494:pharmacology; D010641:Phenotype; D043585:Receptor, Muscarinic M2 / Q000235:genetics* / Q000378:metabolism; D013216:Reflex, Startle / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012472:Salivation / Q000187:drug effects; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D014202:Tremor / Q000139:chemically induced
D017931:DNA Primers; D043585:Receptor, Muscarinic M2; D010095:Oxotremorine
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