A recent review study published in Trends in Genetics and led by Prof. GUO Yalong from the Institute of Botany of the Chinese Academy of Sciences summarized the key factors driving transposable element (TE) abundance enigma in Arabidopsis.

Researchers highlighted the "double-edged sword" nature of TE transposition. TEs can both facilitate adaptive evolution and exert deleterious effects on the host. They then discussed the evolutionary factors that explain variation in TE abundance, and summarized how genetic, epigenetic, and environmental factors regulate TE silencing and activation, ultimately leading to TE abundance variation.

Moreover, researchers focused on the TEs that manage to escape host repression and become reactivated, which are referred to as active TEs. They systematically characterized active TEs, one of the major drivers to TE abundance variation, and discussed the approaches for their identification and their future applications.

"This study addresses a fundamental question in TE biology: why TE abundance varies across species, populations, and individuals, and systematically discussed the mechanisms underlying this enigma from multiple perspectives," said Prof. GUO.