The Assembly and Maintenance of Heterochromatin

Heterochromatin supports several important functions important to cells. Heterochromatin can be constitutive or facultative, both of which play a major role in gene expression. The importance of heterochromatin reflects why plants use several routes to maintain it. I will explain some of these approaches here. Introduction The two states of chromatin are called euchromatin and heterochromatin. Clustered DNA is called heterochromatin, and it is rich in chromosome centromere and telomere.

DNA in eukaryotic nuclei is compressed to chromatin and chromatin is spatially subdivided into euchromatic domain and heterochromatin domain. Euchromatin and heterochromatin can be defined morphologically or functionally and it is important to explicitly specify which of these definitions to use. Morphologically, the region where the electron density of the nucleus is low is called euchromatin, and the densely high density region of electron is called heterochromatin. Functionally, euchromatin is thought to be transcriptionally active and readily available, but heterochromatin is less accessible and transcriptionally silent. Contrary to the general idea, the morphology of chromatin and its functional classification are not considered to be worldwide relevant in at least mammalian cells (127). In contrast, euchromatin and heterochromatin appear to reflect the abundance of genes and genes in the genome, almost independently of the transcriptional status of the gene.

Our data show the correlation between changes in heterochromatin structure with age and expression and metastasis of TE during normal aging. This led to investigate whether direct or indirect genetic manipulation of heterochromatin structure and maintenance could also affect aging-related changes in TE expression. In order to validate our hypothesis we genetically enhanced the siRNA pathway and the activity of Sir 2, two key lines that maintain inhibitory heterochromatin in somatic cells. Using a transgenic flight line we hope to increase the genotype of Sir2, Dicer-2, and Su (var) 3-9 and stabilize heterochromatin intervention using Adar hypomorph I will. Each of these genes provides a unique and complementary approach to simultaneously manipulate heterochromatin domains to enhance TE silencing.

Chromatin-modified genetic intervention inhibits age-related transposable factor activation and prolongs life span of fruit flies

The present inventors have shown that aging is associated with loss of silencing of genes located naturally in the TE and heterochromatin domains, thereby resulting in an increase in TE mobilization and an associated increase in DNA damage in the whole organism model . The pathways and processes of heterochromatin maintenance, RNAi and gene and TE silencing are very likely to represent potential steady-state rejection points leading to an aging phenotype. Here, genetics of pathways associated with these aging, as the manipulation of several genes involved in the maintenance of heterochromatin structure, TE silencing and RNAi effects inhibits direct age-related TE expression and lifespan Proof of evidence is also provided. Also, we demonstrate that inhibition of retrotransposon activity is closely related to prolongation of lifespan.

Chromatin-modified genetic intervention inhibits age-related transposable factor activation and prolongs life span of fruit flies