SHH
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- HHG1
- HLP3
- HPE3
- SMMCI
- holoprosencephaly 3
- sonic hedgehog (Drosophila) homolog
- sonic hedgehog homolog (Drosophila)
- Sonic hedgehog protein precursor (SHH) (HHG-1)
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This gene, which is expressed only
during embryogenesis, encodes a protein that is instrumental in patterning the early
embryo. It has been implicated as the key inductive signal in patterning of the ventral
neural tube, the anterior-posterior limb axis, and the ventral somites. Of three human
proteins showing sequence and functional similarity to the sonic hedgehog protein of
Drosophila, this protein is the most similar. The protein is made as a precursor that is
autocatalytically cleaved; the N-terminal portion is soluble and contains the signalling
activity while the C-terminal portion is involved in precursor processing. More
importantly, the C-terminal product covalently attaches a cholesterol moiety to the
N-terminal product, restricting the N-terminal product to the cell surface and preventing
it from freely diffusing throughout the developing embryo. Defects in this protein or in
its signalling pathway are a cause of holoprosencephaly (HPE), a disorder in which the
developing forebrain fails to correctly separate into right and left hemispheres. HPE is
manifested by facial deformities. In addition, it is thought that mutations in this gene
or in its signalling pathway may be responsible for VACTERL syndrome, which is
characterized by vertebral defects, anal atresia, tracheoesophageal fistula with
esophageal atresia, radial and renal dysplasia, cardiac anomalies, and limb abnormalities.
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- Location: 7q36
- Orientation: Minus strand
- Size: 9,409 bases
- 3 Exons
- DNA Sequence: NT_007741
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- Mutations and SNPs (According
to HGMD and SNP)
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- m-RNA Sequence: NM_000193
- Size: 1576 bp
- c-DNA Libraries: SHH
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Protein sequence: Q15465
Homologous genes: SHH
2D PAGE:
3D Structure:
PTM: SHH
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