Reverse transcriptase domain sequences from tree peony (Paeonia suffruticosa) long terminal repeat retrotransposons:...

Area of Science:

• Genomics
• Molecular Biology
• Botany

Background:

• Tree peonies are valuable horticultural and medicinal plants.
• Long terminal repeat retrotransposons (LTR-retrotransposons) significantly influence plant genomes, but their characteristics in tree peonies remain unknown.
• Understanding LTR-retrotransposon sequence, distribution, and activity is vital for tree peony genome research.

Purpose of the Study:

• To characterize Ty1-copia-like retrotransposons in the tree peony genome.
• To determine their genetic distribution across different tree peony species.
• To assess their transcriptional activity.

Main Methods:

• Polymerase chain reaction (PCR) was used to amplify Ty1-copia-like reverse transcriptase sequences from tree peony DNA.
• Phylogenetic analysis and sequence alignment were performed on the amplified fragments.
• Dot-blot and reverse transcriptase PCR (RT-PCR) were employed to study distribution and transcriptional activity.

Main Results:

• Thirty-three Ty1-copia-like retrotransposon sequences were identified and classified into six families, exhibiting high sequence heterogeneity.
• Most sequences contained frame shifts or stop codons, suggesting potential non-functionality.
• These retrotransposons are distributed across studied tree peony species, with varying hybridization signals.
• RT-PCR confirmed that Ty1-copia retrotransposons in tree peony are transcriptionally inactive.

Conclusions:

• This study provides the first comprehensive genetic and evolutionary information on Ty1-copia-like retrotransposons in tree peony.
• The characterized retrotransposons are widespread but transcriptionally inactive, offering insights into genome evolution.
• These findings lay the groundwork for future research on retrotransposon utilization in tree peony.