7-155803523-C-G

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PP2PP3

The NM_000193.4(SHH):c.766G>C(p.Glu256Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000418 in 1,435,950 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E256K) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000042 ( 0 hom. )

Consequence

SHH
NM_000193.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.32

Publications

3 publications found

Variant links:

Genes affected

SHH (HGNC:10848): (sonic hedgehog signaling molecule) This gene 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. It is also 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. Additionally, mutations in a long range enhancer located approximately 1 megabase upstream of this gene disrupt limb patterning and can result in preaxial polydactyly. [provided by RefSeq, Jul 2008]

SHH Gene-Disease associations (from GenCC):

holoprosencephaly 3
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
microphthalmia, isolated, with coloboma 5
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia
polydactyly of a triphalangeal thumb
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
solitary median maxillary central incisor syndrome
Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: G2P, Ambry Genetics
skeletal system disorder
Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
autosomal dominant preaxial polydactyly-upperback hypertrichosis syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
hypoplastic tibiae-postaxial polydactyly syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
microphthalmia, isolated, with coloboma
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
syndactyly type 4
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
triphalangeal thumb-polysyndactyly syndrome
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
holoprosencephaly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

SHH links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PP2

Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 26 curated pathogenic missense variants (we use a threshold of 10). The gene has 8 curated benign missense variants. Gene score misZ: 2.9479 (below the threshold of 3.09). Trascript score misZ: 0.49525 (below the threshold of 3.09). GenCC associations: The gene is linked to polydactyly of a triphalangeal thumb, microphthalmia, isolated, with coloboma 5, solitary median maxillary central incisor syndrome, holoprosencephaly 3, skeletal system disorder, hypoplastic tibiae-postaxial polydactyly syndrome, holoprosencephaly, syndactyly type 4, microphthalmia, isolated, with coloboma, autosomal dominant preaxial polydactyly-upperback hypertrichosis syndrome, triphalangeal thumb-polysyndactyly syndrome.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.759

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SHH	NM_000193.4 link	c.766G>C	p.Glu256Gln	missense_variant	Exon 3 of 3	ENST00000297261.7	NP_000184.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
SHH	ENST00000297261.7 link	c.766G>C	p.Glu256Gln	missense_variant	Exon 3 of 3	1	NM_000193.4	ENSP00000297261.2
SHH	ENST00000430104.5 link	c.301+2773G>C		intron_variant	Intron 3 of 3	1		ENSP00000396621.1
SHH	ENST00000435425.1 link	n.301+2773G>C		intron_variant	Intron 3 of 4	1		ENSP00000413871.1
SHH	ENST00000441114.5 link	n.301+2773G>C		intron_variant	Intron 3 of 4	1		ENSP00000410546.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000145

AC:

AN:

206638

AF XY:

0.0000262

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000929

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000418

AC:

AN:

1435950

Hom.:

Cov.:

AF XY:

0.00000561

AC XY:

AN XY:

713342

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33244

American (AMR)

AF:

0.0000930

AC:

AN:

43000

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25760

East Asian (EAS)

AF:

0.00

AC:

AN:

39096

South Asian (SAS)

AF:

0.00

AC:

AN:

84150

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40316

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5714

European-Non Finnish (NFE)

AF:

0.00000181

AC:

AN:

1105012

Other (OTH)

AF:

0.00

AC:

AN:

59658

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.508

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Holoprosencephaly 3

Uncertain:1

Feb 20, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with glutamine, which is neutral and polar, at codon 256 of the SHH protein (p.Glu256Gln). This variant is present in population databases (no rsID available, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with SHH-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Uncertain

0.050

BayesDel_noAF

Uncertain

0.040

CADD

Uncertain

(source)

DANN

Benign

0.93

DEOGEN2

Pathogenic

0.92

Eigen

Benign

0.16

Eigen_PC

Benign

0.057

FATHMM_MKL

Uncertain

0.93

LIST_S2

Benign

0.85

M_CAP

Pathogenic

0.96

MetaRNN

Pathogenic

0.76

MetaSVM

Pathogenic

1.1

MutationAssessor

Uncertain

2.2

PhyloP100

4.3

PrimateAI

Pathogenic

0.88

PROVEAN

Benign

-1.8

REVEL

Pathogenic

0.72

Sift

Benign

0.10

Sift4G

Benign

0.13

Polyphen

1.0

Vest4

0.31

MutPred

0.60

Loss of sheet (P = 0.1398);

MVP

0.93

ClinPred

0.34

GERP RS

3.3

Varity_R

0.37

gMVP

0.87

Mutation Taster

=77/23

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over