TCF7L2

Overview

TCF7L2 (Transcription Factor 7 Like 2, also known as TCF4) encodes the principal nuclear effector of the Wnt/beta-catenin signaling pathway in the intestinal epithelium. When beta-catenin translocates to the nucleus following Wnt pathway activation, it binds TCF7L2 to activate Wnt target gene transcription. TCF7L2 is one of the most studied Wnt pathway transcription factors in colorectal cancer, where it cooperates with beta-catenin to drive expression of pro-proliferative targets. Somatic deletions and mutations of TCF7L2 represent an alternative mechanism of Wnt pathway dysregulation in colorectal tumors lacking APC mutations.

Alterations observed in the corpus

  • Deleted or mutated in 12% of non-hypermutated colorectal cancer cases (TCGA CRC cohort, 276 tumors); focal deletion at 10q25.2 identified; TCF7L2 alterations represent an alternative Wnt pathway activation mechanism PMID:22810696
  • New recurrent mutations identified in colorectal cancer; Wnt pathway transcription factor PMID:22895193

Cancer types (linked)

  • COAD: Recurrent focal deletions and somatic mutations in non-hypermutated colorectal adenocarcinoma (12% prevalence); associated with Wnt pathway dysregulation PMID:22810696

Co-occurrence and mutual exclusivity

  • APC: TCF7L2 deletions/mutations likely represent an alternative route to Wnt activation in tumors with intact APC; pattern suggests partial mutual exclusivity PMID:22810696
  • CTNNB1: Activating CTNNB1 mutations occur preferentially in APC-wild-type tumors; co-occurrence pattern with TCF7L2 alterations not explicitly reported PMID:22810696
  • TCF7L1: Paralogous TCF/LEF family member altered via NAV2-TCF7L1 fusion in 3 CRC cases; both genes converge on Wnt pathway transcriptional dysregulation PMID:22810696

Therapeutic relevance

  • No direct therapeutic agent targeting TCF7L2; Wnt pathway inhibitors under development may be relevant for TCF7L2-altered colorectal tumors PMID:22810696

Open questions

  • Whether TCF7L2 deletions are driver events or passenger alterations in CRC requires functional validation PMID:22810696
  • Clinical significance and co-mutation context of TCF7L2-altered tumors have not been fully characterized

Sources

This page was processed by entity-page-writer on 2026-05-06. - PMID:22895193

This page was processed by wiki-cli on 2026-05-06.