Identifying related L1 retrotransposons by analyzing 3' transduced sequences.

Abstract:

BACKGROUND:A large fraction of the human genome is attributable to L1 retrotransposon sequences. Not only do L1s themselves make up a significant portion of the genome, but L1-encoded proteins are thought to be responsible for the transposition of other repetitive elements and processed pseudogenes. In addition, L1s can mobilize non-L1, 3'-flanking DNA in a process called 3' transduction. Using computational methods, we collected DNA sequences from the human genome for which we have high confidence of their mobilization through L1-mediated 3' transduction. RESULTS:The precursors of L1s with transduced sequence can often be identified, allowing us to reconstruct L1 element families in which a single parent L1 element begot many progeny L1s. Of the L1s exhibiting a sequence structure consistent with 3' transduction (L1 with transduction-derived sequence, L1-TD), the vast majority were located in duplicated regions of the genome and thus did not necessarily represent unique insertion events. Of the remaining L1-TDs, some lack a clear polyadenylation signal, but the alignment between the parent-progeny sequences nevertheless ends in an A-rich tract of DNA. CONCLUSIONS:Sequence data suggest that during the integration into the genome of RNA representing an L1-TD, reverse transcription may be primed internally at A-rich sequences that lie downstream of the L1 3' untranslated region. The occurrence of L1-mediated transduction in the human genome may be less frequent than previously thought, and an accurate estimate is confounded by the frequent occurrence of segmental genomic duplications.

journal_name

Genome Biol

journal_title

Genome biology

authors

Szak ST,Pickeral OK,Landsman D,Boeke JD

doi

10.1186/gb-2003-4-5-r30

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

R30

issue

5

eissn

1474-7596

issn

1474-760X

journal_volume

4

pub_type

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