Epigenetic mechanisms modulate gene expression without altering the underlying DNA nucleotide sequence. Among these, DNA methylation typically represses transcription by obstructing the binding of transcriptional machinery or recruiting chromatin-remodeling proteins. However, recent genomic mapping in mammalian neurons reveals that DNA methylation within gene bodies (intragenic regions), rather than at promoter regions, frequently correlates with elevated transcriptional activity. Neuroscientist Dr. Aris Thorne notes that this intragenic methylation prevents aberrant transcription initiation from cryptic internal sites, thereby preserving the fidelity of full-length transcript synthesis during intensive neural signaling.
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Verbal·Craft and Structure·Text Structure and Purpose
mediumWhich choice best states the primary purpose of the text?
A
To dispute the long-held scientific consensus that epigenetic modifications play any functional role in cellular differentiation
B
To explain how intragenic DNA methylation serves an unexpectedly facilitative role in transcriptional fidelity within neurons
C
To contrast the metabolic efficiency of neuronal transcription machinery with that of non-neuronal somatic cells
D
To propose a new therapeutic intervention for genetic disorders caused by promoter region hypermethylation