A Microsatellite-Based Multilocus Screen for the Identification of Local Selective Sweeps

Corresponding author: Christian Schlötterer, Veterinärmedizinische Universität Wien, Josef Baumann Gasse 1, 1210 Wien, Austria., christian.schloetterer{at}vu-wien.ac.at (E-mail)

Communicating editor: J. HEY

With the availability of completely sequenced genomes, multilocus scans of natural variability have become a feasible approach for the identification of genomic regions subjected to natural and artificial selection. Here, I introduce a new multilocus test statistic, ln RV, which is based on the ratio of observed variances in repeat number at a set of microsatellite loci in two groups of populations. The distribution of ln RV values captures demographic history of the populations as well as variation in microsatellite mutation among loci. Given that microsatellite loci associated with a recent selective sweep differ from the remainder of the genome, they are expected to fall outside of the distribution of neutral ln RV values. The ln RV test statistic is applied to a data set of 94 loci typed in eight non-African and two African human populations.

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