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PMID:24334608

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Citation

Zou, J, Zheng, T, Ren, C, Askew, C, Liu, XP, Pan, B, Holt, JR, Wang, Y and Yang, J (2014) Deletion of PDZD7 disrupts the Usher syndrome type 2 protein complex in cochlear hair cells and causes hearing loss in mice. Hum. Mol. Genet. 23:2374-90

Abstract

Usher syndrome type 2 (USH2) is the predominant form of USH, a leading genetic cause of combined deafness and blindness. PDZD7, a paralog of two USH causative genes, USH1C and USH2D (WHRN), was recently reported to be implicated in USH2 and non-syndromic deafness. It encodes a protein with multiple PDZ domains. To understand the biological function of PDZD7 and the pathogenic mechanism caused by PDZD7 mutations, we generated and thoroughly characterized a Pdzd7 knockout mouse model. The Pdzd7 knockout mice exhibit congenital profound deafness, as assessed by auditory brainstem response, distortion product otoacoustic emission and cochlear microphonics tests, and normal vestibular function, as assessed by their behaviors. Lack of PDZD7 leads to the disorganization of stereocilia bundles and a reduction in mechanotransduction currents and sensitivity in cochlear outer hair cells. At the molecular level, PDZD7 determines the localization of the USH2 protein complex, composed of USH2A, GPR98 and WHRN, to ankle links in developing cochlear hair cells, likely through its direct interactions with these three proteins. The localization of PDZD7 to the ankle links of cochlear hair bundles also relies on USH2 proteins. In photoreceptors of Pdzd7 knockout mice, the three USH2 proteins largely remain unchanged at the periciliary membrane complex. The electroretinogram responses of both rod and cone photoreceptors are normal in knockout mice at 1 month of age. Therefore, although the organization of the USH2 complex appears different in photoreceptors, it is clear that PDZD7 plays an essential role in organizing the USH2 complex at ankle links in developing cochlear hair cells. GenBank accession numbers: KF041446, KF041447, KF041448, KF041449, KF041450, KF041451.

Links

PubMed PMC3976334 Online version:10.1093/hmg/ddt629

Keywords

Animals; Gene Deletion; Hair Cells, Auditory/metabolism; Hearing Loss/genetics; Hearing Loss/metabolism; Membrane Proteins/genetics; Membrane Proteins/metabolism; Mice; Mice, Knockout; Molecular Sequence Data; Nerve Tissue Proteins/genetics; Nerve Tissue Proteins/metabolism; Receptors, G-Protein-Coupled/genetics; Receptors, G-Protein-Coupled/metabolism; Usher Syndromes/genetics; Usher Syndromes/metabolism

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

MOUSE:PDZD7

located_in

GO:0002141: stereocilia ankle link

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000601)|part_of:(EMAPA:17597)
  • part_of:(CL:0000589)

Seeded From UniProt

complete

MOUSE:PDZD7

acts_upstream_of_or_within

GO:0050910: detection of mechanical stimulus involved in sensory perception of sound

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:4433578

P

  • occurs_in:(EMAPA:17597)
  • occurs_in:(CL:0000601)

Seeded From UniProt

complete

MOUSE:PDZD7

acts_upstream_of_or_within

GO:0060117: auditory receptor cell development

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:4433578

P

Seeded From UniProt

complete

MOUSE:PDZD7

acts_upstream_of_or_within

GO:0060088: auditory receptor cell stereocilium organization

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:4433578

P

  • occurs_in:(EMAPA:17597)
  • occurs_in:(CL:0000601)

Seeded From UniProt

complete

MOUSE:PDZD7

acts_upstream_of_or_within

GO:0045184: establishment of protein localization

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:4433578

P

  • occurs_in:(EMAPA:17597)
  • occurs_in:(CL:0000601)
  • transports_or_maintains_localization_of:(UniProtKB:Q8VHN7)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000589)
  • transports_or_maintains_localization_of:(UniProtKB:Q80VW5)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000589)
  • transports_or_maintains_localization_of:(UniProtKB:Q2QI47)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000589)
  • transports_or_maintains_localization_of:(UniProtKB:Q8VHN7)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000601)
  • transports_or_maintains_localization_of:(UniProtKB:Q80VW5)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000601)
  • transports_or_maintains_localization_of:(UniProtKB:Q2QI47)

Seeded From UniProt

complete

MOUSE:USH2A

located_in

GO:0002141: stereocilia ankle link

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000589)|part_of:(EMAPA:17597)
  • part_of:(CL:0000601)

Seeded From UniProt

complete

MOUSE:USH2A

located_in

GO:1990075: periciliary membrane compartment

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(CL:0010009)

Seeded From UniProt

complete

MOUSE:USH2A

acts_upstream_of_or_within

GO:0045184: establishment of protein localization

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:3702040

P

  • occurs_in:(EMAPA:17597)
  • occurs_in:(CL:0000589)
  • transports_or_maintains_localization_of:(UniProtKB:E9Q9W7)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000601)
  • transports_or_maintains_localization_of:(UniProtKB:E9Q9W7)

Seeded From UniProt

complete

MOUSE:WHRN

located_in

GO:0032426: stereocilium tip

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000589)|part_of:(EMAPA:17597)
  • part_of:(CL:0000601)

Seeded From UniProt

complete

MOUSE:WHRN

located_in

GO:0002141: stereocilia ankle link

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000589)|part_of:(EMAPA:17597)
  • part_of:(CL:0000601)

Seeded From UniProt

complete

MOUSE:WHRN

located_in

GO:1990075: periciliary membrane compartment

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(CL:0010009)

Seeded From UniProt

complete

MOUSE:AGRV1

located_in

GO:0002141: stereocilia ankle link

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000589)|part_of:(EMAPA:17597)
  • part_of:(CL:0000601)

Seeded From UniProt

complete

MOUSE:AGRV1

located_in

GO:1990075: periciliary membrane compartment

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(CL:0010009)|part_of:(CL:0010009)

Seeded From UniProt

complete

MOUSE:AGRV1

acts_upstream_of_or_within

GO:0045184: establishment of protein localization

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:2389570

P

  • occurs_in:(EMAPA:17597)
  • occurs_in:(CL:0000589)
  • transports_or_maintains_localization_of:(UniProtKB:E9Q9W7)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000601)
  • transports_or_maintains_localization_of:(UniProtKB:E9Q9W7)

Seeded From UniProt

complete

MOUSE:WHRN

part_of

GO:0032426: stereocilium tip

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000589)|part_of:(EMAPA:17597)
  • part_of:(CL:0000601)

Seeded From UniProt

complete

MOUSE:WHRN

acts_upstream_of_or_within

GO:0045184: establishment of protein localization

ECO:0000315: mutant phenotype evidence used in manual assertion

MGI:MGI:1857090
MGI:MGI:4462398

P

  • occurs_in:(EMAPA:17597)
  • occurs_in:(CL:0000589)
  • transports_or_maintains_localization_of:(UniProtKB:E9Q9W7)|occurs_in(EMAPA:17597)
  • occurs_in:(CL:0000601)
  • transports_or_maintains_localization_of:(UniProtKB:E9Q9W7)

Seeded From UniProt

complete

MOUSE:WHRN

part_of

GO:0002141: stereocilia ankle link

ECO:0000314: direct assay evidence used in manual assertion

C

  • part_of:(EMAPA:17597)
  • part_of:(CL:0000589)|part_of:(EMAPA:17597)
  • part_of:(CL:0000601)

Seeded From UniProt

complete

MOUSE:WHRN

part_of

GO:1990075: periciliary membrane compartment

ECO:0000314: direct assay evidence used in manual assertion

C

part_of:(CL:0010009)

Seeded From UniProt

complete

Notes

See also

References

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