GIPC3

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GIPC3
Identifiers
Ensembl
UniProt
RefSeq (mRNA)

NM_133261

NM_148951

RefSeq (protein)

NP_573568

NP_683753

Location (UCSC)Chr 19: 3.59 – 3.59 MbChr 10: 81.34 – 81.34 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

PDZ domain-containing protein GIPC3 is a protein that in humans is encoded by the GIPC3 gene.[5][6] GIPC3 is a member of the GIPC (GAIP-interacting protein C terminus) gene family that also includes GIPC1 and GIPC2.[7] The encoded protein, GIPC3, features a centrally located PDZ domain, which is flanked on each side by a single GIPC-homology domain.[8]

Function

GIPC3 is thought to be important for acoustic signal acquisition and propagation in

hair cells of the mammalian cochlea
.

Gene

The human GIPC3 gene is located on the short arm of chromosome 19 at p13.3. The locus extends over about 8 kbp and contains the six coding exons that give rise to an open reading frame of 639 nucleotides encoding the GIPC3 protein of 312 amino acids. A single PDZ domain is located at amino acid position 122-189. In the mouse, Gipc3 is located on chromosome 10 at cytogenetic band qC1. The genomic region covers a distance of 5.5 kbp. The six coding exons encode a protein of 297 amino acids. The PDZ domain is located at amino acid position 107-174.

Genetics

In the mouse, a missense mutation in Gipc3 (c.343G>A) leads to a non-synonymous amino acid replacement (p.G115R) in the loop connecting two beta strands of the PDZ domain. Glycine 115 is conserved in all GIPC proteins.[9] Missense (c.785C>T; p. L262R) and

sensorineural hearing impairment in families segregating non-syndromic hearing loss
DFNB15 and DFNB95.

Phenotypes

Mice of the

positional cloning approach aimed to decipher the genetic basis of both the hearing loss and audiogenic seizure susceptibility subsequently identified the glycine to arginine
substitution in Gipc3 as the underlying cause.

In humans, individuals with the p.W301X missense mutation (DFNB95) exhibit bilateral sensorineural hearing loss with threshold shifts of 70-80 dB hearing levels as early as 11 months of age.

Interactions

The PDZ domain of GIPC family proteins interact with:[7]

  • Frizzled-3 (
    FZD3
    ) class of WNT receptor,
  • insulin-like growth factor-I receptor (IGF1R),
  • receptor tyrosine kinase
    TrkA
    ,
  • TGF-beta type III receptor (TGF-beta RIII),
  • integrin alpha6A (
    ITGA6
    ),
  • transmembrane glycoprotein TPBG, and
  • RGS19/RGS-GAIP.

See also

  • GIPC PDZ domain containing family, member 1, GIPC1
  • GIPC PDZ domain containing family, member 2, GIPC2

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000179855Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000034872Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ "Entrez Gene: GIPC PDZ domain containing family".
  6. PMID 11836571
    .
  7. ^ .
  8. .
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  10. .
  11. .

Further reading

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