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What is epigenetics?
Heritable changes in gene expression that do NOT involve changes in DNA sequence.
Why was epigenetics discovered?
Identical twins → different phenotypes
X-linked gene expression mismatch
Same genome, different cell types
Euchromatin vs heterochromatin?
Euchromatin:
Open structure
Active transcription
Gene-rich
Heterochromatin:
Condensed
Transcriptionally inactive
Repetitive DNA
Constitutive vs facultative heterochromatin?
Constitutive: always inactive (centromeres, telomeres)
Facultative: can switch (gene regulation)