The use of behavioral test batteries, II: Effect of test interval
Introduction
Behavioral test batteries are commonly utilized to evaluate the behavioral responses of transgenic and knockout mice (for review, see Refs. [3], [13], [15]). Among the advantages are the use of fewer mice and the ability to assess multiple and overlapping domains of CNS function within the same mouse, which increases the number of phenotypes identified and improves interpretation of observable phenotypic differences. Our laboratory has routinely and successfully used a test battery described by Crawley and Paylor [3] to identify behavioral phenotypes in several lines of mutant mice (e.g., Refs. [1], [4], [7], [8], [9], [10], [14]). Behavioral assays in the test battery were selected to represent several, overlapping domains of CNS function and performed in an order such that the tests thought to be the least invasive were performed prior to those thought to be more invasive [3]. In addition, the inter-test interval varied from one to four weeks to allow the mice adequate recovery time between tests and reduce the likelihood of previous test experience. However, it was not known to what extent these issues influenced test performance, therefore systematic studies (e.g., Refs. [5], [11], [12]) to examine the effects of test history, test order and inter-test interval were initiated.
In a previous study, we addressed how test history and test order affected the performance of inbred mice assessed in our standard test battery [6]. Some of the behavioral tests in the test battery were sensitive to the effects of prior test experience while other tests were immune to these effects. Test order did not have a dramatic impact on behavioral test performance. In the current study, we investigated the effects of inter-test interval on the behavioral responses of inbred mice in our standard test battery compared to a rapid test battery in which tests were administered with a 1–2 day inter-test interval. We were particularly interested in determining whether the test battery could be performed with shorter inter-test intervals to facilitate rapid, high-throughput behavioral phenotyping screens. Except for the open-field test, there were no significant effects of inter-test interval, validating the use of rapid test batteries for high-throughput behavioral phenotyping.
Section snippets
Animals
Male mice of 3 different inbred strains and 1 F1 cross were used for the first experiment: 18 male C57BL/6J, 14 male 129S5/SvEvBrd, 18 male FVB/NJ, and 13 male mice from a 129S6/SvEvTac X C57BL/6J F1 cross (S6B6F1). C57BL/6J (B6), FVB/NJ, and 129S5/SvEvBrd (129S5) were selected as representative strains because they are commonly used in studies with knockout and transgenic mice. In the second experiment, 17 C57BL/6J and 15 129S5/SvEvBrd female mice were used. Parental stock for C57BL/6J and
Results
In the first experiment the effect of inter-test interval was evaluated in 4 strains of male mice. In order to assess whether female mice might be more susceptible to inter-test interval, a second experiment was repeated using female B6 and 129S5 mice. The female strains were chosen because they were likely to represent the behavioral extremes of variation between strains, based on the results of the first experiment with male mice. Although the male and female experiments were performed
Discussion
A summary of our findings is presented in Table 1. As expected, strain-dependent effects were observed for most of the behaviors measured. However, we found very little effect of reducing the inter-test intervals from 1 week to 1–2 days on the overall performance of male or female mice assessed in an abbreviated version of the test battery described by Crawley and Paylor [3]. In the current study the test that appeared to be the most sensitive to the effects of inter-test interval was the
Acknowledgements
This work was supported by the National Institutes of Health, NIA (to RP) and NICHD (Baylor's MRDDRC Neurobehavioral Core).
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