Skip to content
Pathcue

Gene Expression and Regulation Cheat Sheet

The core ideas of Gene Expression and Regulation distilled into a single, scannable reference — perfect for review or quick lookup.

PiqCue — piqcue.com/gene-expression-regulation/cheatsheet

Quick Reference

Transcription

The process of synthesizing mRNA from a DNA template, catalyzed by RNA polymerase, which reads the template strand 3' to 5' and builds mRNA 5' to 3'.

Translation

The process of decoding mRNA into a polypeptide chain at the ribosome, using tRNA molecules that carry amino acids matched to mRNA codons.

Operon

A cluster of genes in prokaryotes transcribed together under the control of a single promoter and operator, allowing coordinated regulation.

Transcription Factor

A protein that binds to specific DNA sequences (promoters or enhancers) to regulate the rate of transcription of a target gene.

Epigenetics

Heritable changes in gene expression that do not alter the DNA sequence itself, typically involving chemical modifications to DNA or histone proteins.

Alternative Splicing

A post-transcriptional process in which different combinations of exons from the same pre-mRNA are joined together, producing multiple protein variants from a single gene.

Codon

A three-nucleotide sequence in mRNA that specifies a particular amino acid or a stop signal during translation.

Chromatin Remodeling

The dynamic modification of chromatin architecture by enzyme complexes that alter histone-DNA interactions, making DNA more or less accessible for transcription.

RNA Interference (RNAi)

A biological process in which small RNA molecules (siRNA or miRNA) silence gene expression by targeting complementary mRNA for degradation or translational repression.

Differential Gene Expression

The process by which cells with identical genomes express different sets of genes, leading to distinct cell types and functions in a multicellular organism.

Key Terms at a Glance

Transcription:The process of synthesizing RNA from a DNA template using RNA polymerase.
Translation:The process of synthesizing a polypeptide from an mRNA template at the ribosome.
Promoter:A DNA sequence upstream of a gene where RNA polymerase and transcription factors bind to initiate transcription.
Operator:A DNA sequence in a prokaryotic operon where a repressor protein binds to regulate transcription.
Operon:A cluster of prokaryotic genes transcribed together under the control of a single promoter and operator.
Enhancer:A distant regulatory DNA sequence that increases transcription when bound by activator proteins.
Epigenetics:Heritable changes in gene expression not involving alterations to the DNA sequence, often through DNA methylation or histone modification.
Codon:A three-nucleotide sequence in mRNA that specifies an amino acid or stop signal during translation.
Anticodon:A three-nucleotide sequence on tRNA that is complementary to an mRNA codon.
Chromatin Remodeling:The dynamic modification of chromatin structure to regulate access to DNA for transcription.
Alternative Splicing:A post-transcriptional mechanism in which different exon combinations from the same pre-mRNA produce distinct mature mRNAs.
RNA Interference:A gene silencing mechanism in which small RNA molecules (siRNA or miRNA) target complementary mRNA for degradation or translational repression.
TATA Box:A conserved DNA sequence (TATAAA) in eukaryotic promoters that positions the transcription initiation complex.
Nonsense Mutation:A point mutation that creates a premature stop codon, resulting in a truncated and usually nonfunctional protein.

Get study tips in your inbox

We'll send you evidence-based study strategies and new cheat sheets as they're published.

We'll notify you about updates. No spam, unsubscribe anytime.

Gene Expression and Regulation Cheat Sheet - Quick Reference Guide | PiqCue