rs1060502268

Positions:

• chr9-95476835-C-A
• chr9-95476835-C-G
• chr9-95476835-C-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PS1_Moderate PM1 PM2 PM5 PP3_Strong PP5_Moderate

The NM_000264.5(PTCH1):​c.1526G>T​(p.Gly509Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in UniProt. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G509D) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.39

Genes affected

PTCH1 (HGNC:9585): (patched 1) This gene encodes a member of the patched family of proteins and a component of the hedgehog signaling pathway. Hedgehog signaling is important in embryonic development and tumorigenesis. The encoded protein is the receptor for the secreted hedgehog ligands, which include sonic hedgehog, indian hedgehog and desert hedgehog. Following binding by one of the hedgehog ligands, the encoded protein is trafficked away from the primary cilium, relieving inhibition of the G-protein-coupled receptor smoothened, which results in activation of downstream signaling. Mutations of this gene have been associated with basal cell nevus syndrome and holoprosencephaly. [provided by RefSeq, Aug 2017]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PS1: Transcript NM_000264.5 (PTCH1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
• PM1: In a helix (size 8) in uniprot entity PTC1_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_000264.5
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-95476835-C-T is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.982
• PP5: Variant 9-95476835-C-A is Pathogenic according to our data. Variant chr9-95476835-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 1068908.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr9-95476835-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PTCH1	NM_000264.5	c.1526G>T	p.Gly509Val	missense_variant	11/24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.1523G>T	p.Gly508Val	missense_variant	11/24	ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.1526G>T	p.Gly509Val	missense_variant	11/24	5	NM_000264.5	ENSP00000332353.6
PTCH1	ENST00000437951.6	c.1523G>T	p.Gly508Val	missense_variant	11/24	5	NM_001083603.3	ENSP00000389744.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gorlin syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 14, 2020

For these reasons, this variant has been classified as Pathogenic. The Gly509 amino acid residue in PTCH1 has been determined to be clinically significant (PMID: 12655573, 24204797, 16301862, 16088933). This suggests that variants that disrupt this residue are likely to be causative of disease. Experimental studies have shown that this missense change acts as a dominant-negative receptor resulting in the ectopic activation of the Hedgehog signaling pathway (PMID: 15042702, 12192414, 26893459). This variant has been observed to segregate with Gorlin syndrome, in a family (PMID: 8840969) and has also been observed in an unrelated individual affected with Gorlin syndrome (PMID: 15712338). This variant is not present in population databases (ExAC no frequency). This sequence change replaces glycine with valine at codon 509 of the PTCH1 protein (p.Gly509Val). The glycine residue is moderately conserved and there is a moderate physicochemical difference between glycine and valine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.86	D;.;.;.;.;.;.;.
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.95	D;.;D;D;.;.;D;D
M_CAP	Pathogenic	0.41	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M;.;.;.;.;.;.;.
PrimateAI	Pathogenic	0.95	D
PROVEAN	Pathogenic	-7.8	D;D;D;D;D;D;D;D
REVEL	Pathogenic	0.92
Sift	Uncertain	0.0010	D;D;D;D;D;D;D;D
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;.
Polyphen		1.0	D;D;D;D;D;D;D;.
Vest4		0.98
MutPred		0.91		Loss of sheet (P = 0.0315);.;.;.;.;.;.;.;
MVP		0.94
MPC		1.7
ClinPred		1.0	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.96
gMVP		0.97

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-98239117;