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Transposable element insertion: a hidden major source of domesticated phenotypic variation in Brassica rapa
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Transposable element insertion: a hidden major source of domesticated phenotypic variation in Brassica rapa
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Journal Article
Transposable element insertion: a hidden major source of domesticated phenotypic variation in Brassica rapa
2022
Overview
Summary Transposable element (TE) is prevalent in plant genomes. However, studies on their impact on phenotypic evolution in crop plants are relatively rare, because systematically identifying TE insertions within a species has been a challenge. Here, we present a novel approach for uncovering TE insertion polymorphisms (TIPs) using pan‐genome analysis combined with population‐scale resequencing, and we adopt this pipeline to retrieve TIPs in a Brassica rapa germplasm collection. We found that 23% of genes within the reference Chiifu‐401‐42 genome harbored TIPs. TIPs tended to have large transcriptional effects, including modifying gene expression levels and altering gene structure by introducing new introns. Among 524 diverse accessions, TIPs broadly influenced genes related to traits and acted a crucial role in the domestication of B. rapa morphotypes. As examples, four specific TIP‐containing genes were found to be candidates that potentially involved in various climatic conditions, promoting the formation of diverse vegetable crops in B. rapa. Our work reveals the hitherto hidden TIPs implicated in agronomic traits and highlights their widespread utility in studies of crop domestication.
