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Basics of Gene Expression Control definitions

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  • Gene Expression
    Selective process by which cells produce specific proteins and RNAs, enabling unique cell functions despite identical genetic material.
  • Cell Differentiation
    Process resulting in specialized cell types, driven by selective activation of certain genes for distinct cellular roles.
  • Housekeeping Genes
    Genetic elements required for basic cellular survival, consistently active in all cell types regardless of function.
  • Transcriptional Control
    Regulation determining whether a gene's DNA is converted into RNA, often influenced by DNA accessibility and chemical modifications.
  • Histone Modification
    Chemical changes to proteins around which DNA is wrapped, affecting gene accessibility and transcription potential.
  • DNA Methylation
    Addition of chemical groups to DNA, typically silencing genes by blocking access to transcription machinery.
  • Multipotent Stem Cell
    Progenitor capable of generating multiple specialized cell types, such as various blood cells, through gene expression changes.
  • RNA Splicing
    Editing process where specific RNA segments are joined or removed, creating diverse mRNA and protein variants from a single gene.
  • RNA Transport
    Movement of RNA molecules to specific cellular locations, influencing where and how gene products are synthesized.
  • Translational Control
    Mechanism regulating whether mRNA is used to build proteins, impacting the final output of gene expression.
  • Exon
    Segment of a gene's RNA that is retained and joined during splicing, contributing to the final mRNA and protein structure.
  • Transcription Machinery
    Collection of proteins and enzymes responsible for reading DNA and synthesizing RNA during gene expression.
  • External Signals
    Environmental or hormonal cues that influence gene activity, enabling cells to adapt gene expression to changing conditions.
  • Gene Product
    Functional molecule, such as a protein or RNA, resulting from the expression of a gene and determining cellular traits.
  • Cell Specialization
    Outcome of selective gene expression, resulting in cells with unique structures and functions within an organism.