52 research outputs found
Hyperkeratinization and hyperplasia of the forestomach epithelium in vitamin A deficient rats
The influence of fixation on the relative amount of cytoplasmic ribosomes in mouse epidermal basal keratinocytes
Mitochondrial inclusions in keratinocytes of hairless mouse skin exposed to UVB radiation
Acceleration of epithelial keratinization by carcinogens in fetal rat forestomach in organ culture
WART, KERATOACANTHOMA, AND SQUAMOUS CELL CARCINOMA: A SPECTRUM OF THE SAME NEOPLASTIC PROCESS?
The DNA repair gene MBD4 (MED1) is mutated in human carcinomas with microsatellite instability
Most tumours arising in individuals affected with hereditary non-polyposis colorectal cancer (HNPCC) are characterized by microsatellite instability (MSI). MSI is also detected in a subset of sporadic colorectal and extracolonic carcinomas. We recently identified a new human DNA repair gene, MBD4 (also known as MED1, for methyl-CpG binding endonuclease), that encodes an MLH1 interactor.
We detected MBD4 mutations in 14 of 56 (25%) primary MSI tumours, 11 of 42 (26.2%) colorectal carcinomas, 2 of 9 (22.2%) endometrial carcinomas and 1 of 5 (20%) pancreatic tumours. Analysis of the corresponding normal DNAs indicated that the mutations were somatic.Overall, these studies further illustrate that in a subset of human carcinomas a mutational process is set in motion that progressively targets DNA repair genes and steadily increases genomic
instability
- …