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A Genomic Reference Panel for Drosophila serrata.

Adam J Reddiex1, Scott L Allen1, Stephen F Chenoweth2

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We sequenced 110 inbred lines of Drosophila serrata, revealing high nucleotide diversity and effective inbreeding. A genome-wide association study identified SNPs linked to hydrocarbon traits, aiding future population genomic research.

Keywords:
GWASMPPMultiparental Populationsmontiumpopulation geneticsquantitative genetics

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Area of Science:

  • Population Genomics
  • Quantitative Genetics
  • Insect Genetics

Background:

  • Drosophila serrata, part of the montium group, is well-studied for adaptation and sexual selection.
  • Existing research highlights the importance of this species in understanding evolutionary processes.
  • A need exists for genomic resources to complement existing Drosophila melanogaster panels.

Purpose of the Study:

  • To describe a new collection of re-sequenced inbred lines of Drosophila serrata.
  • To provide a resource for population genomic and quantitative genetic studies.
  • To investigate genetic architecture and conservation across Drosophila species.

Main Methods:

  • Sequencing of 110 inbred lines of Drosophila serrata using Illumina paired-end reads (average 23.5x coverage).
  • SNP calling using the Joint Genotyper for Inbred Lines (JGIL), yielding over 15 million biallelic SNPs.
  • Genome-wide association study (GWAS) on a cuticular hydrocarbon trait (2-Me-C28).

Main Results:

  • Highly effective inbreeding resulted in low residual heterozygosity (0.86%).
  • Rapid decay of linkage disequilibrium (r² < 0.1 within 100 bp).
  • Preliminary GWAS identified 4 significant SNPs associated with 2-Me-C28, including one near the Cht9 gene, potentially involved in hydrocarbon transport.

Conclusions:

  • The developed panel of inbred Drosophila serrata lines is a valuable resource for future research.
  • The findings support high nucleotide diversity and suggest negative selection in natural populations.
  • This resource will facilitate comparative studies of genetic architectures within the Drosophila genus.