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:
- Template Strand (Antisense): This is the 3’ to 5’ strand that RNA polymerase actually "reads".
- Coding Strand (Sense): This is the 5’ to 3’ strand. It is not used as a template, but its sequence is nearly identical to the resulting RNA transcript, with one key difference: DNA uses thymine (T), while RNA uses uracil (U).
When the RNA polymerase moves along the template, it creates an RNA-DNA heteroduplex (or RNA-DNA hybrid). During this process, the enzyme catalyzes the addition of ribonucleoside triphosphates by attacking the 3’ hydroxyl group of the growing chain with the α-phosphorus of the incoming nucleotide.
Exam Tip: Base Pairing Rules Remember that while DNA uses A-T and G-C, RNA transcription follows these rules with one substitution:
- G pairs with C (3 hydrogen bonds)
- A pairs with U (2 hydrogen bonds)
![A diagram showing the DNA double helix with the template strand and coding strand, illustrating how RNA polymerase uses the 3' to 5' template strand to synthesize a 5' to 3' RNA transcript that is complementary to the template and identical to the coding strand (except U for 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