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Retrofitting the genome: L1 extinction follows endogenous retroviral expansion in a group of muroid rodents.

Abstract：

:Long interspersed nuclear element 1 (LINE-1; L1) retrotransposons are the most common retroelements in mammalian genomes. Unlike individual families of endogenous retroviruses (ERVs), they have remained active throughout the mammalian radiation and are responsible for most of the retroelement movement and much genome rearrangement within mammals. They can be viewed as occupying a substantial niche within mammalian genomes. Our previous demonstration that L1s and B1 short interspersed nuclear elements (SINEs) are inactive in a group of South American rodents led us to ask if other elements have amplified to fill the empty niche. We identified a novel and highly active family of ERVs (mysTR). To determine whether loss of L1 activity was correlated with expansion of mysTR, we examined mysTR activity in four South American rodent species that have lost L1 and B1 activity and four sister species with active L1s. The copy number of recent mysTR insertions was extremely high, with an average of 4,200 copies per genome. High copy numbers exist in both L1-active and L1-extinct species, so the mysTR expansion appears to have preceded the loss of both SINE and L1 activity rather than to have filled an empty niche created by their loss. It may be coincidental that two unusual genomic events--loss of L1 activity and massive expansion of an ERV family--occur in the same group of mammals. Alternatively, it is possible that this large ERV expansion set the stage for L1 extinction.

journal_name

J Virol

journal_title

Journal of virology

authors

Erickson IK,Cantrell MA,Scott L,Wichman HA

doi

10.1128/JVI.05180-11

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

12315-23

issue

23

eissn

0022-538X

issn

1098-5514

pii

JVI.05180-11

journal_volume

85

pub_type

杂志文章

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