What is the effect of high levels of histone acetylation on the expression of a gene?Group of answer choicesThis changes the splicing of the geneIt causes the chromatin to condenseThe gene becomes expressed lessThe gene becomes expressed more
Question
What is the effect of high levels of histone acetylation on the expression of a gene?Group of answer choicesThis changes the splicing of the geneIt causes the chromatin to condenseThe gene becomes expressed lessThe gene becomes expressed more
Solution
High levels of histone acetylation generally lead to an increase in gene expression. Here's why:
-
Histones are proteins that DNA wraps around. They help to package DNA into a compact, dense form called chromatin.
-
Acetylation is a process where an acetyl group is added to a molecule. In the context of histones, acetylation usually occurs at lysine residues.
-
When histones are acetylated, the charge interaction between the histone and the DNA is reduced. This is because the acetyl group neutralizes the positive charge of the histone, making it less attracted to the negatively charged DNA.
-
As a result, the DNA wrapped around the histone becomes less compact and more relaxed. This relaxed state of chromatin is known as euchromatin.
-
Euchromatin is more accessible to the transcription machinery, which includes RNA polymerase and other proteins necessary for transcription. This means that genes in regions of euchromatin are more likely to be transcribed into mRNA, and subsequently translated into proteins.
-
Therefore, high levels of histone acetylation generally lead to an increase in gene expression.
Similar Questions
How does histone acetylation activate transcription in eukaryotes?Group of answer choicesby increasing the affinity of histone for DNAby recruiting other components of the transcriptional machineryby inhibiting the active remodeling of the chromatin structureall of the abovenone of the above
Which of the following is most likely to increase expression of a particular gene? Group of answer choicesa mutation in a silencerrecruitment of histone methyltransferasesrecruitment of histone deacetylasescis regulation by a lncRNA
Affects of acetylation on histones (lysine)?Select your answer:Select your answerOPTION ALTERNATIVE Adding acetyl group to the end of the histone makes it negative makes the DNA that its associated with more readily transcribed Removes positive charge from the side-chain so weakens the interaction between histones and negatively charged DNA. All of the above
Increase in histone deacetylases.B. Increase in histone acetyltransferases.C. Decrease in DNA methyltransferases.D. Decrease in CpG methylation of promoter
Which of the following will lead to a decrease in transcription of a gene?A. Increase in histone deacetylases.B. Increase in histone acetyltransferases.C. Decrease in DNA methyltransferases.D. Decrease in CpG methylation of promoter
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.