Horizontal SPINning of transposons

Area of Science:

• Genomics
• Molecular Biology
• Evolutionary Biology

Background:

• Horizontal transfer (HT) is the movement of genetic material between reproductively isolated organisms.
• HT is considered a rare event in eukaryotes, contrasting with frequent vertical inheritance.
• DNA transposons are mobile genetic elements that can potentially move between genomes.

Purpose of the Study:

• To investigate the extent of horizontal transfer (HT) in shaping eukaryotic genomes.
• To provide evidence for horizontal transfer of a specific DNA transposon family (SPACE INVADERS or SPIN) across distantly related species.
• To explore the evolutionary history and taxonomic distribution of SPIN transposons.

Main Methods:

• Comparative genomics analysis across multiple tetrapod species.
• Phylogenetic analysis to trace the origin and spread of SPIN transposons.
• Bioinformatic tools to identify and quantify transposon insertions.

Main Results:

• Evidence found for independent horizontal transfer of SPIN DNA transposons into seven distantly related tetrapod species.
• SPIN elements amplified to high copy numbers within each host genome post-transfer.
• The distribution of SPIN suggests a potential transoceanic HT event from Old to New World species.

Conclusions:

• Horizontal transfer (HT) may play a more significant role in shaping eukaryotic genomes than previously recognized.
• The SPACE INVADERS (SPIN) transposon family provides a compelling case study for understanding HT dynamics.
• Further research is needed to fully elucidate the impact of HT on genome evolution across diverse taxa.