Results: 12

Non-coding RNAs and chromatin: key epigenetic factors from spermatogenesis to transgenerational inheritance

Biol. Res; 54 (), 2021
Cellular fate and gene expression patterns are modulated by different epigenetic factors including non-coding RNAs (ncRNAs) and chromatin organization. Both factors are dynamic throughout male germ cell differentiation on the seminiferous tubule, despite the transcriptional inactivation in the last stage...

Follicular Lesions with Papillary Nuclear Characteristics: Differences in Chromatin Detected by Computerized Image Analysis

ABSTRACT Objective: Follicular lesions of the thyroid with papillary carcinoma nuclear characteristics are classified as infiltrative follicular variant of papillary thyroid carcinoma-FVPTC (IFVPTC), encapsulated/well demarcated FVPTC with tumour capsular invasion (IEFVPTC), and the newly described cate...

Impaired protamination and sperm DNA damage in a Nellore bull with high percentages of morphological sperm defects in comparison to normospermic bulls

The routine semen evaluation assessing sperm concentration, motility and morphology, does not identify subtle defects in sperm chromatin architecture. Bulls appear to have stable chromatin, with low levels of DNA fragmentation. However, the nature of fragmentation and its impact on fertility remain uncle...

A possible role of Drosophila CTCF in mitotic bookmarking and maintaining chromatin domains during the cell cycle

Biol. Res; 48 (), 2015
BACKGROUND: The CCCTC-binding factor (CTCF) is a highly conserved insulator protein that plays various roles in many cellular processes. CTCF is one of the main architecture proteins in higher eukaryotes, and in combination with other architecture proteins and regulators, also shapes the three-dimensiona...

Caracterização da proteína quinase C Beta I nuclear em células tronco embrionárias

As proteína quinases C (PKC) pertencem à família das serina/treonina quinases, que vem sendo apontadas como importantes enzimas para os processos de proliferação e diferenciação das células tronco embrionárias (CTE), todavia, a função exata de cada isoforma dessa família ainda não está clar...

Análise de modificações epigenéticas em regiões regulatórias do gene Ifng em linfócitos T

O interferon (IFN)-γ é a principal citocina envolvida na resposta imune antitumoral, além de ser essencial para a imunidade contra patógenos intracelulares. Enquanto células T CD8 produzem IFN-γ rapidamente após ativação, células T CD4 só produzem esta citocina após diferenciação no fenóti...

Mammalian histone acetyltransferase complexes

Medicina (B.Aires); 60 Suppl 2 (), 2000
Over the last decade, great progress has been made in elucidating how the human genome operates in the chromatin context. This paper describes our work on two human acetyltransferases, PCAF and TIP60, and their interaction partners. This study provides new clues on the function of these enzymes. In a str...

Las láminas nucleares y la cromatina, forman un complejo que es reconocido por una población de anticuerpos anti-DNA nativo
Anti-nDNA antibodies and cross-react with the laminar structures of the nucleus

Rev. mex. reumatol; 12 (4), 1997
En el presente trabajo se determinó la afinidad de los anticuerpos anti-DNA por estructuras laminares del núcleo: para ésto se utilizaron sueros de pacientes con lupus que presentaban anticuerpos antinucleares con patrón anular y anti-DNAn. Se realizaron pruebas de fluorescencia en células digeridas...