rs769022340

chr9-95447133-C-Achr9-95447133-C-Gchr9-95447133-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_000264.5(PTCH1):c.4123G>T(p.Ala1375Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign 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. A1375T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.97

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, PTCH1
• BP4: Computational evidence support a benign effect (MetaRNN=0.3803242).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTCH1	NM_000264.5	c.4123G>T	p.Ala1375Ser	missense_variant	23/24	ENST00000331920.11
PTCH1	NM_001083603.3	c.4120G>T	p.Ala1374Ser	missense_variant	23/24	ENST00000437951.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTCH1	ENST00000331920.11	c.4123G>T	p.Ala1375Ser	missense_variant	23/24	5	NM_000264.5	A2
PTCH1	ENST00000437951.6	c.4120G>T	p.Ala1374Ser	missense_variant	23/24	5	NM_001083603.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000405 AC: 1 AN: 246968 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134494

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000548

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000826 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Gorlin syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 24, 2017

In summary, this variant is a rare missense change with uncertain impact on protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant is present in population databases (rs769022340, ExAC 0.01%) but has not been reported in the literature in individuals with a PTCH1-related disease. This sequence change replaces alanine with serine at codon 1375 of the PTCH1 protein (p.Ala1375Ser). The alanine residue is moderately conserved and there is a moderate physicochemical difference between alanine and serine. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 18, 2024

The p.A1375S variant (also known as c.4123G>T), located in coding exon 23 of the PTCH1 gene, results from a G to T substitution at nucleotide position 4123. The alanine at codon 1375 is replaced by serine, an amino acid with similar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Based on the available evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Uncertain	0.030	T
BayesDel_noAF	Uncertain	-0.030
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.39	T;.;.;.;.;.;.
Eigen	Benign	0.021
Eigen_PC	Benign	0.13
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;.;D;D;.;.;D
M_CAP	Uncertain	0.26	D
MetaRNN	Benign	0.38	T;T;T;T;T;T;T
MetaSVM	Uncertain	0.37	D
MutationAssessor	Uncertain	2.3	M;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-0.81	N;N;N;N;N;N;N
REVEL	Uncertain	0.36
Sift	Uncertain	0.012	D;D;D;D;D;D;D
Sift4G	Uncertain	0.019	D;D;D;D;D;D;D
Polyphen		0.12	B;.;.;B;B;.;B
Vest4		0.61
MutPred		0.30		Gain of glycosylation at A1375 (P = 0.0052);.;.;.;.;.;.;
MVP		0.55
MPC		0.39
ClinPred		0.87	D
GERP RS		4.2
Varity_R		0.17
gMVP		0.70

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

Other links and lift over

dbSNP: rs769022340; hg19: chr9-98209415;