Wolbachia

Wolbachia assembles and annotates the complete circularized 1.3 Mb genome (wHae) of the Wolbachia endosymbiont from the horn fly Haematobia irritans irritans using PacBio long-read and Illumina short-read sequencing to enable comparative genomics and analysis of cytoplasmic incompatibility loci.

Key Features:

• Genome Assembly: A fully circularized 1.3 Mb wHae genome was produced from horn fly genomic DNA using PacBio long-read and Illumina short-read sequencing.
• Gene Annotation: The annotated wHae genome contains 1,249 coding genes, 34 transfer RNAs (tRNAs), three ribosomal RNAs (rRNAs), and five prophage regions.
• Comparative Genomics: Whole-genome comparisons show wHae is closely related to supergroup A Wolbachia strains infecting Drosophila, exhibiting high nucleotide identity despite substantial genome rearrangements.
• Cytoplasmic Incompatibility (CI) Analysis: Two distinct phylogenetic CI loci were identified in wHae, including a horizontally acquired CifB homolog from distant supergroup A Wolbachia strains.

Scientific Applications:

• Biocontrol Research: The wHae genome provides a genomic resource for investigating Wolbachia-based biological control strategies targeting horn flies (Haematobia irritans irritans).
• Insecticide Resistance Studies: Genomic data support investigations into how Wolbachia influences host biology that may inform alternative pest management approaches amid rising insecticide resistance.
• Evolutionary Biology: Evidence of genome rearrangements and horizontal gene transfer informs studies on the evolution of endosymbiotic relationships and host–parasite dynamics.

Methodology:

Reassembly of genomic DNA libraries using PacBio long-read sequencing complemented by Illumina short-read data produced the circularized wHae genome; comparative genomics and whole-genome Bayesian evolutionary analysis were performed to resolve phylogenetic relationships.