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Epigenetics
Epigenetics is the study of changes in gene expression and cellular phenotype that occur without alterations to the underlying DNA sequence. These states are mediated by mechanisms such as DNA methylation, histone modification, and non-coding RNA activity.
Overview
These regulatory mechanisms determine chromatin accessibility and transcriptional activity across developmental stages and distinct cell lineages. While many epigenetic modifications are stably maintained and transmitted across mitotic cell divisions, transgenerational inheritance through the germline remains restricted or contested in many organisms. Environmental factors can influence these regulatory marks, altering cellular phenotypic states without altering primary nucleotide sequences.
Why it matters
The field demonstrates how identical genotypes can manifest diverse phenotypes and disease susceptibilities depending on regulatory contexts. In medicine, altered chromatin and methylation patterns serve as biomarkers and therapeutic targets for certain hematologic malignancies.
Related concepts
- DNA (Deoxyribonucleic Acid)appliedEpigenetics is applied through practical methods that strengthen real-world work in DNA (Deoxyribonucleic Acid).
- BiologylogicalEpigenetics provides conceptual grounding that helps explain Biology in this knowledge graph.
- Developmental BiologylogicalEpigenetics provides conceptual grounding that helps explain Developmental Biology in this knowledge graph.
- Behavioral GeneticslogicalEpigenetics provides conceptual grounding that helps explain Behavioral Genetics in this knowledge graph.
- Gene ExpressionlogicalEpigenetics directly governs gene expression by establishing heritable chromatin states that determine which genes are active or silenced in each cell type.