Widespread somatic L1 retrotransposition occurs early during gastrointestinal cancer evolution

ABSTRACT: Somatic L1 retrotransposition events have been shown to occur in epithelial cancers1-8. 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 multip

ORGANISM(S): Homo sapiens

SUBMITTER: Szilvia Solyom 

PROVIDER: E-GEOD-63601 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress