How Does Histone Acetylation Affect Gene Expression?

Thus, acetylation of histones is known to increase the expression of genes through transcription activation. ... By deacetylating the histone tails, the DNA becomes more tightly wrapped around the histone cores, making it harder for transcription factors to bind to the DNA.

How do histones affect gene expression?

Mis-regulated histone expression leads to aberrant gene transcription by altering the chromatin structure. Tightly packaged chromatin structure makes DNA less accessible for transcription machinery, whereas an open chromatin structure is prone to induce gene expression.

What effect does acetylation have on gene expression transcription?

The addition of the acetyl group neutralizes this positive charge and hence reduces the binding between histones and DNA, leading to a more open structure which is more accessible to the transcriptional machinery. Histone acetylation therefore leads to transcriptional activation.