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er 50% of the B. mori OAC1 protein dataset. Although the ortholog hit ratio does not consider the effects of alternative splicing, it appears to be an excellent method for the comparative assessment of assemblies. Using this measure, as well as simpler mea sures such as contig and singleton count, we found the Celera Assembler to be an effective tool for OAC1 handling pop ulation level datasets, particularly when custom parame ters are used. 454 sequencing and assembly has proven an effective platform for SNP discovery, Variant regions detected with the Celera Assembler may prove useful for population level studies, further supporting Celera Assembler for this type of data. Significantly, the discovery of 36 K high quality SNPs for E. propertius and 62 K SNPs for P.
zelicaon will facilitate future stud ies of population structure and genetic causes of func tional differences already found between populations, Methods Rearing and RNA Isolation Eggs laid by adult E. propertius and P. Bafilomycin A1 zelicaon females were hatched under conditions characteristic of native habitats in a greenhouse and then moved to Conviron growth chambers at the University of Notre Dame. Multi ple individuals of each larval instar were collected through the final instar before pupation, Individuals of the 2nd, 3rd, and 4th instars and 3rd and 4th instars were exposed to a heat stress of 35 degrees for 60 minutes and a cold stress of 0 degrees for 120 minutes. Individuals in the 5th and 6th instar of E. propertius and 3rd and 5th instars of P. zelicaon were exposed to a desiccation agent for 120 minutes.
In addition, some of the collected RNA polymerase larvae of P. zelicaon were fed Petroselinum crispum and others were fed Lomatium utriculatum. The former contains higher con centrations of linear furanocoumarins, a defensive com pound against herbivores, than the latter, After treatment, larvae were frozen in liquid nitrogen Bafilomycin A1 and stored at 80 C. Whole body RNA from these frozen individuals was extracted using an RNA Easy kit over a period of two months. Prior to library construction, pool ing was done by adjusting sample contributions to equimolar amounts of total RNA per individual. Library Construction and 454 Sequencing OAC1 Bafilomycin A1 Library construction was performed by Express Genom ics, Inc, Poly RNA from the E. propertius and P.
zelicaon total RNAs was isolated by OAC1 two rounds of oligo selection with oligo coated magnetic particles, From the poly RNA mRNA, cDNA libraries were constructed by using an oligo dT primer adapter contain ing a Not I site and Moloney Murine Leukemia Virus Reverse Transcriptase to prime and synthe size first strand cDNA. This process includes only one round of reverse transcription. After the second strand was synthesized, the double stranded cDNA was size fractionated and cloned directionally into the Not I and Eco RV sites of the pExpress 1 vector. From one bulk ligation, followed by electroporation into T1 phage resistant E. coli, primary clones were produced. Normalized cDNA libraries were produced from the primary cDNA libraries. Biotinylated driver RNA pro duced from the T7 RNA polymerase promoter and sin gle stranded target DNA produced from the F1 ori were hybridized to each other at a low Cot value.
The RNA. DNA hybrids Bafilomycin A1 were removed by phenol extraction and the remaining ss target DNA was converted to dou ble stranded DNA with a repair oligo and Taq DNA polymerase. After electroporation of the dsDNA into T1 phage resistant E. coli, primary clones were pro duced. The E. propertius and P. zelicaon normalized library DNAs were digested with Not I and in vitro RNA tran scripts were produced using the SP6 RNA polymerase promoter. Then, first strand cDNA was made from these transcripts using a modified primer adapter that reduces the size of the poly A sequence, After the second strand was synthesized, the double stranded cDNA was blunt ended and size fractionated. This ds cDNA was resuspended in TE, pH 8. 0, to between 110 125 ng ml. The pooled sample for each species