In this process, chromatin is rearranged to form a more accessible form that will be available for gene expression, or to carry out the mRNA formation i.e. Transcription and followed by the binding of DNA proteins.
Regulation of gene expression can be exerted at four levels:-
(i) Transcriptional level during the formation of the primary transcript,
(ii) Processing like splicing, terminal additions or modifications.
(iii) Transport of mRNAs from the nucleus to the cytoplasm and
(iv) Translational level.