Skip to content
GenoLensGenoLens

POLG2

Chr 17q23.3

DNA polymerase gamma 2, accessory subunit

Aliases:
MTPOLB, HP55
MANE:
ENST00000539111.7

Annotations refreshed 1 month ago.

Predicted protein structure

Clinical relevance (Genomics England PanelApp)

Diagnostic Grade (Green)

  • Acute rhabdomyolysis

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Fetal anomalies

    BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
  • Inherited white matter disorders

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Likely inborn error of metabolism

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Mitochondrial disorders

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Mitochondrial DNA maintenance disorder

    BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
  • Possible mitochondrial disorder - nuclear genes

    BOTH monoallelic and biallelic (but BIALLELIC mutations cause a more SEVERE disease form), autosomal or pseudoautosomal
  • Rhabdomyolysis and metabolic muscle disorders

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal

+6 more panels — install the extension to see the full list inline on any page.

Disease associations (Open Targets)

  • progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal dominant 4

    0.77
  • mitochondrial dna depletion syndrome 16B (neuroophthalmic type)

    0.73
  • mitochondrial DNA depletion syndrome 16 (hepatic type)

    0.67
  • autosomal dominant progressive external ophthalmoplegia

    0.67
  • neurodegenerative disease

    0.46
  • acute liver failure

    0.27
  • Acute hepatic failure

    0.27
  • asthma

    0.26
  • hereditary spastic paraplegia

    0.18
  • Abnormality of refraction

    0.14

Score is the Open Targets composite evidence score (0-1). Higher = stronger gene-disease association.

Protein function (UniProt)

DNA polymerase subunit gamma-2

Accessory subunit of DNA polymerase gamma solely responsible for replication of mitochondrial DNA (mtDNA). Acts as an allosteric regulator of the holoenzyme activities. Enhances the polymerase activity and the processivity of POLG by increasing its interactions with the DNA template. Suppresses POLG exonucleolytic proofreading especially toward homopolymeric templates bearing mismatched termini. Binds to single-stranded DNA

Data sources: HGNC (CC BY 4.0), AlphaFold (CC BY 4.0, Jumper et al. Nature 2021), Genomics England PanelApp (CC BY 4.0), ClinGen, Open Targets (CC0), UniProt.

Not for sole clinical decision-making. Always verify against primary sources.