Gene Regulation (Eukaryotic Gene Regulation ( (TATA box (Transcription…
Eukaryotic Gene Regulation
Enhancer/ enhancer region
Histones + acetyl groups = loose chromatin
DNA + methyl groups = TIGHTLY coiled chromatin
Repressors and Silencers
stops or slows down transcription
DNA- bending proteins push transcription factors closer to promoter
speeds up transcription
alternative RNA splicing
Introns are cut out of mRNA
exons are left
genes are turned "on" or "off"
Differential Gene Expression
Prokaryotic Gene Regulation
Repressor + inducer= transcription turns "on"
this happens when lactose enters your body and you have to start creating lactase again to break it down.
Transcription is normally turned "off"
This is reversible
transcription is normally "on"
An inactive repressor + corepressor= active repressor
active repressor binds to operator
Transcription turns "off"
This happens when tryptophan enters your body (when you eat) and you no longer need to create tryptophan being made by transcription
mRNA is created