Transcriptome analysis reveals the gene expression changes in Strongyloides ratti tissue-migrating larvae

Area of Science:

• Parasitology
• Molecular Biology
• Genomics

Background:

• Strongyloides ratti larvae invade rats via a unique nasofrontal route.
• The transcriptomic profile of these tissue-migrating larvae (hL3) is currently unknown.
• Understanding larval gene expression is crucial for elucidating host invasion mechanisms.

Purpose of the Study:

• To characterize the transcriptomic profile of S. ratti head-derived tissue-migrating third-stage larvae (hL3).
• To identify genes and molecular pathways involved in larval migration and immune modulation.
• To compare gene expression between hL3 and infective third-stage larvae (iL3).

Main Methods:

• RNA sequencing (RNA-seq) was performed on hL3 and iL3 of S. ratti.
• Differential gene expression analysis was conducted to identify upregulated genes in hL3.
• Quantitative RT-PCR (qRT-PCR) was used to validate key gene expressions.

Main Results:

• 664 genes were found to be upregulated in hL3 compared to iL3.
• Enriched gene families included astacin metalloproteases and SCP/TAPS proteins, associated with tissue invasion.
• Seven hL3-specific astacin genes were identified, with one similar to the tissue-penetration protein strongylastacin.
• Two SCP/TAPS genes were unique to hL3, suggesting specific roles in migration.

Conclusions:

• This study presents the first transcriptomic profile of S. ratti hL3.
• Astacin metalloproteases and SCP/TAPS proteins are likely key players in larval tissue migration and immune evasion.
• Chemosensory G protein-coupled receptor pathways appear less critical during this migratory stage.