Gene expression

Gene expression is the controlled production of RNA and protein from DNA, including when, where, and how much a gene is used.

Expression control is the cell’s first answer to environment and development — a core undergrad mechanism.

Claim ledger

What the evidence shows

Drawn from 13 studies in this library. Mix labels say which citation roles are present; they are not a strength score. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope.

• ● Supporting studies only

  Multiple empirical papers in this library examine gene expression with mechanistic biological findings.

  3 studies
  1. 1What marks definitive endoderm progenitors in hESCs?
  2. 2Do SNPs prove exonic splicing enhancers are real?
  3. 3Where does cells minimize expression noise?

  Study comparison

  Study	Role	Design	N	Population	Outcome
  What marks definitive endoderm progenitors in hESCs?2016	Supports	Animal / in-vitroscRNA-seq of H1/H9 progenitors and oxygen-condition tests during definitive endoderm differentiation	N=1018 · 1,018 single cells analysed (including H1 n=212, H9 n=162, HFFs n=159)	Human embryonic stem cells and lineage-specific progenitors	Single-cell regulators and hypoxia effects on definitive endoderm differentiation
  Do SNPs prove exonic splicing enhancers are real?2004	Supports	Computational / modellingMapped common SNPs onto exons relative to RESCUE-ESE motifs vs simulated mutations	Human SNP/ESE comparative genomics — not a sample-N study	Human exonic SNPs and splicing-enhancer motif sets	Purifying selection signatures on exonic splicing enhancers
  Where does cells minimize expression noise?2004	Supports	Computational / modellingGenome-wide yeast expression analysis testing noise minimization for essential genes and complex subunits	Yeast genome-wide expression strategies — not a sample-N study	Saccharomyces cerevisiae genes (essential genes and complex subunits)	Minimization of stochastic expression noise for sensitive genes

• ○ Limited citations

  PC5 separates DE cells; metabolism genes load on that axis; severe hypoxia (1.5% O2) increases CXCR4+ DE-like cells versus higher O2.

  1 study
  1. 1What marks definitive endoderm progenitors in hESCs?

• ○ Limited citations

  ESE disruption and near-splice positions show signatures consistent with purifying selection; splicing constrains human exon evolution.

  1 study
  1. 1Do SNPs prove exonic splicing enhancers are real?

• ○ Limited citations

  Noise is minimized for essential genes and complex subunits via transcriptional/translational control, at a cost; noise appears generally deleterious.

  1 study
  1. 1Where does cells minimize expression noise?

• ○ Limited citations

  FECR1 is a FLI1 exonic circRNA that activates FLI1 epigenetically and promotes invasive phenotypes; FLI1 is elevated in tumor vs adjacent tissue.

  1 study
  1. 1FLI1 circRNA FECR1 drives metastasis

Debates

Tensions and limits

Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes.

Timeline

How understanding moved

Study years are when the paper was published. Evidence edits are dated changes to this page's claims. Explanations are when PaperFren added a Discovery — not a claim that the science happened that day.

Papers

13 studies in this library bear on Gene expression, ordered by citations.

• How do microRNAs recognize their targets?

  Sites with as little as seven base pairs matching the miRNA 5′ end can confer regulation; such 5′-dominant sites are common in conserved 3′ UTRs.

  PLoS biology · 2005 · 1,726 citations

• Why do identical cells make different amounts of mRNA?

  Mammalian genes switch rarely between ON and OFF, so intrinsically random transcriptional bursts create large cell-to-cell mRNA differences.

  PLoS biology · 2006 · 1,430 citations

• Cataloging mammalian circular RNAs

  Thousands of mammalian circRNAs arise by back-splicing and can be quantified across ENCODE cell types.

  Genome biology · 2014 · 1,316 citations

• MYB transcription-factor families in plants

  Rice and Arabidopsis encode large MYB families dominated by R2R3 types with distinct expression patterns.

  BMC genomics · 2012 · 400 citations

• What marks definitive endoderm progenitors in hESCs?

  Single-cell RNA-seq separates definitive endoderm progenitors and links metabolism/hypoxia to DE differentiation.

  Genome biology · 2016 · 388 citations

• FLI1 circRNA FECR1 drives metastasis

  Exonic circular RNA FECR1 binds the FLI1 promoter and epigenetically activates FLI1 in breast cancer.

  Genome biology · 2018 · 355 citations

• Where does cells minimize expression noise?

  Yeast minimizes protein-expression noise preferentially for essential genes and protein-complex subunits, supporting that noise is generally harmful.

  PLoS biology · 2004 · 321 citations

• Do SNPs prove exonic splicing enhancers are real?

  Human polymorphism patterns validate computationally predicted ESEs and show splicing constrains exon evolution.

  PLoS biology · 2004 · 155 citations

Questions

What is still open

1. Systems and scales differ across gene expression studies (species, tissues, methods), so mechanisms should not be over-generalised.

   Watch this

Ask PaperFren about Gene expression