Chromatin and Bursts of Transcription
Chromatin and its interaction with enzymes has been researched and a conclusion being made is that it is relevant and an important factor in gene expression. Vincent G. Allfrey, a professor at Rockefeller University, stated that RNA synthesis is related to histone acetylation. The lysine amino acid attached to the end of the histones is positively charged. The acetylation of these tails would make the chromatin ends neutral allowing for DNA access.
When the chromatins are opened, they are provide availability for the DNA to enter. Fluctuations between open and closed chromatin may contribute discontinuity of transcription, or transcriptional bursting. Other factors are probably involved, such as the association and dissociation of transcription factor complexes with chromatin. The phenomenon, as opposed to simple probabilistic models of transcription, can account for the high variability in gene expression occurring between cells in isogenic populations.
Read more about this topic: Chromatin
Famous quotes containing the word bursts:
“Cruel with guilt, and daring with despair,
The midnight murderer bursts the faithless bar;
Invades the sacred hour of silent rest
And leaves, unseen, a dagger in your breast.”
—Samuel Johnson (1709–1784)