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Tracking the origin of two genetic components associated with transposable element bursts in domesticated rice
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Tracking the origin of two genetic components associated with transposable element bursts in domesticated rice
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Journal Article
Tracking the origin of two genetic components associated with transposable element bursts in domesticated rice
2019
Overview
Transposable elements (TEs) shape genome evolution through periodic bursts of amplification. In this study prior knowledge of the
mPing/Ping/Pong
TE family is exploited to track their copy numbers and distribution in genome sequences from 3,000 accessions of domesticated
Oryza sativa
(rice) and the wild progenitor
Oryza rufipogon
. We find that
mPing
bursts are restricted to recent domestication and is likely due to the accumulation of two TE components,
Ping16A
and
Ping16A_Stow
, that appear to be critical for
mPing
hyperactivity.
Ping16A
is a variant of the autonomous element with reduced activity as shown in a yeast transposition assay. Transposition of
Ping16A
into a
Stowaway
element generated
Ping16A_Stow
, the only
Ping
locus shared by all bursting accessions, and shown here to correlate with high
mPing
copies. Finally, we show that sustained activity of the
mPing/Ping
family in domesticated rice produced the components necessary for
mPing
bursts, not the loss of epigenetic regulation.
Transposable element (TE) bursts shape genome evolution but their origin remains unclear. Here, the authors show that a burst is restricted to only a few domesticated rice accessions and is associated with the acquisition of two TE variants, Ping16A and Ping16A_Stow, not the loss of TE silencing.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
