We used PCR to determine the infection status of each line with respect to the endosymbiont, Wolbachia pipientis (Braig et al. 1998 (link); Richardson et al. 2012 (link); Supplemental Text S2). We used DGRP_101 and DGRP_105 as negative controls and DGRP_142 and DGRP_149 as positive controls. We also developed PCR assays to genotype all DGRP lines for insertions of Wolbachia genome at 2R:16,594,660 and 2R:19,117,791 (Supplemental Text S2). We purified PCR products for lines positive for Wolbachia insertions using the Zymo Clean and Concentrator kit (Zymo Research Corporation) and subjected them to Sanger sequencing using the ABI 3730XL platform.
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