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Meta Intent: Provide a rigorous structural biology perspective on how DNA compaction dictates gene accessibility, genome stability, and cellular identity. Chromatin and chromosomes are often explained as if they were separate biological entities. In living cells, they are better understood as different physical and functional states of the same genome. Chromatin is the active working […]

In the realm of epigenetics, histone modification constitutes a crucial research area. It involves a series of chemical alterations to histones subsequent to translation. These modifications do not modify the DNA sequence but exert a substantial impact on gene expression and chromatin structure. Introduction of Histone Modification Histone modification refers to the chemical modification of […]

Epigenetic modification represents a sophisticated regulatory mechanism in biology. It involves the modulation of gene expression through chemical alterations or changes in chromatin structure, all while leaving the underlying DNA sequence intact. This mode of regulation has far – reaching implications for a wide range of biological processes, from cellular differentiation during development to the […]

Chromatin remodeling refers to the process of changing the chromatin structure by regulating factors such as transcription factors, histone modifying enzymes and ATP-dependent remodeling complexes. This process includes changing nucleosome density, nucleosome assembly mode, and even adjusting the structure of the whole chromatin region, which directly affects chromatin accessibility and gene expression. What is Chromatin […]

RNA modifications, notably N6-methyladenosine (m6A) methylation, have risen to prominence as pivotal orchestrators of gene expression and cellular dynamics. Within this array of modifications, the m6A methylation of RNA, especially within messenger RNA (mRNA) transcripts, has garnered considerable interest due to its profound involvement in diverse biological phenomena and the onset of pathological conditions. In […]

1992 Bisulfite Treatment for Methylation Samples Commonly referred to as BS conversion, it involves treating methylated samples with bisulfite (abbreviated as "BS"), where "conversion" refers to the process by which unmethylated cytosines (C) are converted to uracils (U) and eventually to thymines (T) through PCR amplification, while methylated cytosines (5mC) are preserved. 2003 Pyrosequencing Pyrosequencing […]

Science’s understanding of genetics primarily focuses on the alterations in gene expression caused by genetic sequence modifications, encompassing gene mutations, heterogeneous loss, and microsatellite instability. Contrastingly, epigenetics considers the changes in gene expression attributable to non-genomic sequence variations, such as DNA methylation and modifications in chromatin conformation. The broader field of epigenomics is dedicated to the genomic […]

Introduction to Transcription Factors Molecules important in controlling gene expression are transcription factors. Normally they are proteins, although they are composed of short, non-coding RNA as well. Transcription variables are also typically seen working in groups or complexes, creating multiple connections that allow varying degrees of control over transcription rates. Transcription factors (TFs) attach to […]

DNA methylation, histone variant, histone modifications, and nucleosome positioning are pathways for epigenetic regulation in eukaryotes. Bacteria, on the other hand, lack histones and nucleosomes; hence, they primarily use DNA methylation as their epigenetic gene regulation. There are three different types of DNA methylation in bacterial genomes: N4-methylcytosine (4mC), N6-methyladenine (6mA), and 5-methylcytosine (5mC). The […]