PIF- and Pong-like transposable elements: distribution, evolution and relationship with Tourist-like miniature...

Area of Science:

• Genomics
• Molecular Biology
• Evolutionary Biology

Background:

• Miniature inverted-repeat transposable elements (MITEs) are abundant in plant genomes.
• MITEs are nonautonomous DNA elements requiring transposases from other elements.
• Tourist-like and Stowaway-like are the two major MITE groups.

Purpose of the Study:

• To investigate the prevalence and diversity of PIF/Pong-like elements in eukaryotes.
• To analyze the relationship between PIF/Pong-like elements and Tourist-like MITEs.
• To identify the sources of transposase for Tourist-like MITEs.

Main Methods:

• Genome-wide analysis of PIF/Pong-like elements using the rice genome sequence.
• Comparative analysis of PIF/Pong-like elements across plant, animal, and fungal genomes.
• Identification and characterization of element-associated transposases.

Main Results:

• PIF- and Pong-like elements are widespread, diverse, and abundant in eukaryotes.
• Hundreds of element-associated transposases were identified in various eukaryotic genomes.
• PIF and Pong represent founding members of a large eukaryotic transposon superfamily.
• PIF/Pong-like elements are responsible for the origin and amplification of Tourist-like MITEs.

Conclusions:

• PIF and Pong transposons form a large superfamily across eukaryotes.
• This superfamily plays a crucial role in the generation and spread of Tourist-like MITEs.
• Understanding these elements provides insights into genome evolution and MITE dynamics.