Widespread somatic L1 retrotransposition occurs early during gastrointestinal cancer evolution.

Abstract:

:Somatic L1 retrotransposition events have been shown to occur in epithelial cancers. Here, we attempted to determine how early somatic L1 insertions occurred during the development of gastrointestinal (GI) cancers. Using L1-targeted resequencing (L1-seq), we studied different stages of four colorectal cancers arising from colonic polyps, seven pancreatic carcinomas, as well as seven gastric cancers. Surprisingly, we found somatic L1 insertions not only in all cancer types and metastases but also in colonic adenomas, well-known cancer precursors. Some insertions were also present in low quantities in normal GI tissues, occasionally caught in the act of being clonally fixed in the adjacent tumors. Insertions in adenomas and cancers numbered in the hundreds, and many were present in multiple tumor sections, implying clonal distribution. Our results demonstrate that extensive somatic insertional mutagenesis occurs very early during the development of GI tumors, probably before dysplastic growth.

journal_name

Genome Res

journal_title

Genome research

authors

Ewing AD,Gacita A,Wood LD,Ma F,Xing D,Kim MS,Manda SS,Abril G,Pereira G,Makohon-Moore A,Looijenga LH,Gillis AJ,Hruban RH,Anders RA,Romans KE,Pandey A,Iacobuzio-Donahue CA,Vogelstein B,Kinzler KW,Kazazian HH Jr,Sol

doi

10.1101/gr.196238.115

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

1536-45

issue

10

eissn

1088-9051

issn

1549-5469

pii

gr.196238.115

journal_volume

25

pub_type

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