6533b82dfe1ef96bd1291329
RESEARCH PRODUCT
Expression ofDNMT3A transcripts and nucleolar localization of DNMT3A protein in human testicular and fibroblast cells suggest a role for de novo DNA methylation in nucleolar inactivation
Thomas HaafRaimund SteinDanuta GaletzkaTim Tralausubject
MaleGene isoformMethyltransferaseNucleolusActive Transport Cell NucleusBiologyBiochemistryGene Expression Regulation EnzymologicDNA Methyltransferase 3ATestisHumansGene silencingDNA (Cytosine-5-)-MethyltransferasesGene SilencingRNA MessengerEpigeneticsMolecular BiologyGeneCells CulturedRegulation of gene expressionCell DifferentiationCell BiologyDNA MethylationFibroblastsMolecular biologySpermatogoniaIsoenzymesembryonic structuresDNA methylationCell Nucleolusdescription
Transcriptional silencing during differentiation of human male germ cells and serum starvation of human fibroblasts is controlled by epigenetic mechanisms that involve de novo DNA methylation. It is associated with high expression of different transcripts of the DNA methyltransferase 3A (DNMT3A) gene that encode two isoforms with de novo methyltransferase activity and one without catalytic activity. Western blots revealed that DNMT3A protein (with catalytic domain) is present at low levels in several tissues and at increased levels in testicular cells and growth-arrested fibroblasts. Immunofluorescence experiments localized DNMT3A to discrete nucleolar foci in B spermatogonia and resting fibroblasts. The data here suggest a role for de novo DNA methylation in nucleolar inactivation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-02-03 | Journal of Cellular Biochemistry |