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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