The HERC2 gene is located near the OCA2 gene on chromosome 15. A region of DNA located in one of the introns of the HERC2 gene can change expression of OCA2 (turning the gene on or off). The DNA region in this intron acts as a transcriptional enhancer for OCA2, recruiting RNA polymerase to the promoter of the OCA2 gene. What type of gene regulation is this?
A) Epigenetic
B) Transcriptional
C) Post-transcriptional
D) Translational
E) Post-translational