chr7-155803118-C-T

Position:

chr7-155803118-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PP3_Strong

The ENST00000297261.7(SHH):c.1171G>A(p.Ala391Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000369 in 1,355,852 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 (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000033 ( 0 hom. )

Consequence

SHH
ENST00000297261.7 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.420

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.961

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SHH	NM_000193.4 linkuse as main transcript	c.1171G>A	p.Ala391Thr	missense_variant	3/3	ENST00000297261.7	NP_000184.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris
SHH	ENST00000297261.7 linkuse as main transcript	c.1171G>A	p.Ala391Thr	missense_variant	3/3	1	NM_000193.4	ENSP00000297261	P1
SHH	ENST00000430104.5 linkuse as main transcript	c.302-2873G>A		intron_variant		1		ENSP00000396621
SHH	ENST00000435425.1 linkuse as main transcript	c.302-2521G>A		intron_variant, NMD_transcript_variant		1		ENSP00000413871
SHH	ENST00000441114.5 linkuse as main transcript	c.302-2451G>A		intron_variant, NMD_transcript_variant		1		ENSP00000410546

Frequencies

GnomAD3 genomes

AF:

0.00000659

AC:

AN:

151762

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000332

AC:

AN:

1203982

Hom.:

Cov.:

AF XY:

0.00000341

AC XY:

AN XY:

585734

show subpopulations

Gnomad4 AFR exome

AF:

0.0000412

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000223

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000203

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151870

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74248

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Asia WGS

AF:

0.000292

AC:

AN:

3440

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 06, 2023

Reported previously in a patient with holoprosencephaly; however, no further clinical or segregation information was provided (PMID: 19603532); Published functional studies in zebrafish describe this variant as essentially normal (PMID: 32939873); In silico analysis supports that this missense variant does not alter protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 32939873, 19603532) -

Holoprosencephaly 3

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Bioinformatics dept., Datar Cancer Genetics Limited, India

Jul 25, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.094

BayesDel_addAF

Pathogenic

0.20

BayesDel_noAF

Uncertain

0.050

CADD

Benign

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.72

Eigen

Benign

-0.62

Eigen_PC

Benign

-0.57

FATHMM_MKL

Benign

0.35

LIST_S2

Benign

0.70

M_CAP

Pathogenic

0.97

MetaRNN

Pathogenic

0.96

MetaSVM

Uncertain

0.72

MutationAssessor

Benign

1.6

MutationTaster

Benign

1.0

PrimateAI

Pathogenic

0.84

PROVEAN

Benign

-0.24

REVEL

Uncertain

0.61

Sift

Benign

0.39

Sift4G

Benign

0.39

Polyphen

0.017

Vest4

0.67

MutPred

0.89

Gain of loop (P = 0.0312);

MVP

1.0

ClinPred

0.25

GERP RS

1.2

Varity_R

0.12

gMVP

0.22

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over