Chromatin modification primarily occurs in two ways: methylation and acetylation.

1. Methylation: This is a process where a methyl group is added to the DNA molecule. It usually happens at a cytosine or adenine DNA nucleotide. Methylation can change the activity of a DNA segment without changing the sequence. When located in a gene promoter, DNA methylation typically acts to repress gene transcription.

2. Acetylation: This process involves the addition of an acetyl group to the histone protein that DNA is wrapped around. Acetylation of histones is associated with gene activation. When the histones are acetylated, the chromatin is in an 'open' state, allowing access for the transcription machinery and therefore, gene expression can take place.

Both of these modifications are part of the epigenetic control of gene expression.

Question

Chromatin modification primarily occurs in two ways: methylation and acetylation.

1. Methylation: This is a process where a methyl group is added to the DNA molecule. It usually happens at a cytosine or adenine DNA nucleotide. Methylation can change the activity of a DNA segment without changing the sequence. When located in a gene promoter, DNA methylation typically acts to repress gene transcription.

2. Acetylation: This process involves the addition of an acetyl group to the histone protein that DNA is wrapped around. Acetylation of histones is associated with gene activation. When the histones are acetylated, the chromatin is in an 'open' state, allowing access for the transcription machinery and therefore, gene expression can take place.

Both of these modifications are part of the epigenetic control of gene expression.

Knowee AI · Accepted Answer

Chromatin modification primarily occurs in two ways: methylation and acetylation.

1. Methylation: This is a process where a methyl group is added to the DNA molecule. It usually happens at a cytosine or adenine DNA nucleotide. Methylation can change the activity of a DNA segment without changing the sequence. When located in a gene promoter, DNA methylation typically acts to repress gene transcription.

2. Acetylation: This process involves the addition of an acetyl group to the histone protein that DNA is wrapped around. Acetylation of histones is associated with gene activation. When the histones are acetylated, the chromatin is in an 'open' state, allowing access for the transcription machinery and therefore, gene expression can take place.

Both of these modifications are part of the epigenetic control of gene expression.

What are the two types of Chromatin Modification? Describe each.

Question

Solution

Similar Questions

Upgrade your grade with Knowee