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ISCU

Chr 12q23.3

iron-sulfur cluster assembly enzyme

Aliases:
ISU2, hnifU
MANE:
ENST00000311893.14

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
  • Likely inborn error of metabolism

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Mitochondrial disorders

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Possible mitochondrial disorder - nuclear genes

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Rhabdomyolysis and metabolic muscle disorders

    BIALLELIC, autosomal or pseudoautosomal
  • Undiagnosed metabolic disorders

    BOTH monoallelic and biallelic, autosomal or pseudoautosomal
  • Arthrogryposis

  • Childhood onset dystonia, chorea or related movement disorder

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Disease associations (Open Targets)

  • hereditary myopathy with lactic acidosis due to ISCU deficiency

    0.72
  • COVID-19

    0.37
  • mitochondrial disease

    0.37
  • inborn mitochondrial metabolism disorder

    0.37
  • open-angle glaucoma

    0.26
  • hereditary disease

    0.19
  • myopathy

    0.11
  • hyperpituitarism

    0.04
  • stroke disorder

    0.04
  • alcohol drinking

    0.04

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

Protein function (UniProt)

Iron-sulfur cluster assembly enzyme ISCU

Mitochondrial scaffold protein, of the core iron-sulfur cluster (ISC) assembly complex, that provides the structural architecture on which the [2Fe-2S] clusters are assembled (PubMed:34824239). The core iron-sulfur cluster (ISC) assembly complex is involved in the de novo synthesis of a [2Fe-2S] cluster, the first step of the mitochondrial iron-sulfur protein biogenesis. This process is initiated by the cysteine desulfurase complex (NFS1:LYRM4:NDUFAB1) that produces persulfide which is delivered on the scaffold protein ISCU in a FXN-dependent manner. Then this complex is stabilized by FDX2 which provides reducing equivalents to accomplish the [2Fe-2S] cluster assembly. Finally, the [2Fe-2S] cluster is transferred from ISCU to chaperone proteins, including HSCB, HSPA9 and GLRX5 (Probable) (PubMed:24971490, PubMed:29576242, PubMed:30031876, PubMed:34824239). Exists as two slow interchanging conformational states, a structured (S) and disordered (D) form (PubMed:23940031). May modulate NFS1 desulfurase activity in a zinc-dependent manner (PubMed:30031876). Modulates the interaction between FXN and the cysteine desulfurase complex (PubMed:29576242)

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.