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Behavioral responses of 129/Sv, C57BL/6J and DBA/2J mice to a non-predator aversive olfactory stimulus

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Capone F., Venerosi A., Puopolo M., Alleva E., Cirulli F.
Acta Neurobiologiae Experimentalis
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2005
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vol. 65
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issue 1
29-38
EN
We examined the behavior of three inbred mouse strains (129/SvPasIco, C57BL/6J, and DBA/2J) exposed to an object soaked with the chemical component of the aversive scent (toluquinone odor) emitted by a myriapod species (Ommatoiulus sabulosus) in the presence of a predator. Subjects were exposed to the odor for three consecutive days. Behavioral responses to the toluquinone odor were characterized both by an approach phase of risk assessment and by a repeated series of approach-avoid episodes. Results indicate that toluquinone exposure reduced completely, and in a strain independent fashion, selected behaviors such as crouching, catching and eating object. Other responses were strain-dependent: the DBA (DBA/2J) strain displayed defensive burying at high levels, C57 (C57BL/6J) mice performed high levels of withdrawal while the 129/Sv (129/SvPasIco) strain showed also high levels of stretch attend posture. Compared to other tasks, this test is ethological, simple, cheap and is not affected by strain differences in appetitive-sensory responses, as shown by some strain-independent responses. These features make this task as a good complement to any exploration-anxiety test battery.
2

Chromosome 7q11 controls sperm beat cross frequency (BCF) in mice

88%
Golas A., Grzmil P., Muller C., Styrna J.
Folia Biologica
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2004
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vol. 52
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issue 3-4
211-217
EN
The aim of this study was to compare the inheritance of the chromosomal SSLP markers with the inheritance of sperm movement parameters in order to map genes responsible for these quantitative traits (QTs). Chromosome 7 and 14 SSLP markers were tested to obtain the strain distribution pattern (SDP) for recombinant inbred (RI) strains developed from two progenitors, KE and CBA/Kw, which differ significantly in gamete quality. Sperm motility characteristics were determined using the computer assisted semen analysis (CASA) system. The Map manager software was used in order to assess linkage between the analyzed motility parameters and chromosome regions. The marker regression, interval mapping and permutation tests matched the QT loci of BCF with chromosome 7q11. The likelihood ratio statistic for this association was 18.1 with 79% of the total trait variance explained by QTL at this locus. These mapping results suggest that the BCF trait depends on the genetic factor(s) located in this region.
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