GSE132814 Helicase-like transcription factor (Hltf) gene-deletion promotes oxidative phosphorylation (OXPHOS) in colorectal tumors of AOM/DSS-treated mice

Contributors : Rebecca A Helmer ; Gurvinder Kaur ; Lisa A Smith ; Beverly S ChiltonSeries Type : Expression profiling by high throughput sequencingOrganism : Mus musculusThe helicase-like transcription factor (HLTF) gene – a tumor suppressor in human colorectal cancer (CRC) - is regulated by alternative splicing and promoter hypermethylation. The detection of hypermethylated HLTF DNA in fecal occult blood tests is an indicator of disease recurrence and poor survival. Hltf-deficiency in the ApcMin/+ mouse strain in creased the formation of intestinal adenocarcinoma with a high incidence of gross chromosomal instabilities. To investigate Hltf-deletion effects in CRC without cross-breeding into a tumorigenic strain, Hltf-deletion was studied in mice treated with the carcinogen azoxymethane (AOM) and the proinfla mmatory agent dextran sulfate (DSS). Hltf-deletion resulted in weight loss beginning at treatment week 6, and poor survival (Kaplan-Meier survival plot). Hltf-deletion increased tumor multiplicity compared to controls, and dramatically shifted the topographic distribution of lesions into the rectum. Differential isoform expression analysis of lesions from control mice revealed both the truncated isoform that lacks a DNA-repair domain and the full length isoform capable of DNA damage repair are present (3:1.8 ratio) during adenocarcinoma formation. iPathwayGuide identified 51 dynamically regula ted genes of 10,967 total genes with measured expression. Oxidative Phosph...
Source: GEO: Gene Expression Omnibus - Category: Genetics & Stem Cells Tags: Expression profiling by high throughput sequencing Mus musculus Source Type: research