Alternative Splice in Alternative Lice

Area of Science:

• Genomics
• Transcriptomics
• Evolutionary Biology

Background:

• Human head and body lice are genetically similar but occupy distinct ecological niches.
• Body lice, unlike head lice, are vectors for serious bacterial diseases like epidemic typhus.
• Understanding molecular differences is key to explaining these distinct adaptations.

Purpose of the Study:

• To investigate alternative splicing (AS) differences between head and body lice.
• To identify molecular bases for distinct ecological niches and vector competence.
• To explore the role of AS in functional adaptation of human lice.

Main Methods:

• Analysis of next-generation sequencing data from head and body louse strains.
• Identification and comparison of alternative splicing events.
• Functional enrichment analysis of genes with specific AS events.

Main Results:

• Identified 3,598 head or body louse-specific AS events.
• Exon skipping was overrepresented, and intron retention underrepresented, in both lice types, more so in body lice.
• Genes with body louse-specific AS were enriched in nervous system, salivary gland, trachea, and ovarian functions.

Conclusions:

• First evidence of transcript pool differences between human head and body lice.
• AS plays a pivotal role in the molecular adaptation of lice, particularly in adapting to clothing.
• Highlights AS as a mechanism driving functional divergence in closely related species.