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Mechanisms of Transcription and mRNA Synthesis

Explains the process of transcription in molecular biology, detailing gene expression, the roles of template and coding strands, and the synthesis of messenger RNA (mRNA).

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In the central dogma of molecular biology, gene expression is the multi-step process by which information from a gene is used to synthesize a functional product. This process involves three fundamental stages: replication (copying DNA to DNA), transcription (copying DNA to RNA), and translation (reading RNA to build proteins).

While replication ensures the entire genome is passed to daughter cells, transcription is a selective process where specific segments of DNA are copied into messenger RNA (mRNA). The mRNA serves as a mobile template that carries the genetic code from the DNA to the ribosome for protein synthesis.

The Architecture of Transcription

To understand how mRNA is synthesized, we must first distinguish between the two strands of the DNA double helix:

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