rs779870576

Positions:

• chr9-95480571-C-A
• chr9-95480571-C-G
• chr9-95480571-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4 BP6

The NM_000264.5(PTCH1):​c.764G>T​(p.Arg255Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,716 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R255W) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 3.92

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 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), PTCH1. . Gene score misZ 1.6774 (greater than the threshold 3.09). Trascript score misZ 3.1343 (greater than threshold 3.09). GenCC has associacion of gene with holoprosencephaly 7, nevoid basal cell carcinoma syndrome, holoprosencephaly.
• BP4: Computational evidence support a benign effect (MetaRNN=0.3800601).
• BP6: Variant 9-95480571-C-A is Benign according to our data. Variant chr9-95480571-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 1501116.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Likely_benign=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTCH1	NM_000264.5	c.764G>T	p.Arg255Leu	missense_variant	6/24	ENST00000331920.11
PTCH1	NM_001083603.3	c.761G>T	p.Arg254Leu	missense_variant	6/24	ENST00000437951.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTCH1	ENST00000331920.11	c.764G>T	p.Arg255Leu	missense_variant	6/24	5	NM_000264.5	A2
PTCH1	ENST00000437951.6	c.761G>T	p.Arg254Leu	missense_variant	6/24	5	NM_001083603.3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251338 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135838

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

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 AF: 0.00000137 AC: 2 AN: 1461716 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727176

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000447

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 24, 2023

The p.R255L variant (also known as c.764G>T), located in coding exon 6 of the PTCH1 gene, results from a G to T substitution at nucleotide position 764. The arginine at codon 255 is replaced by leucine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Gorlin syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 10, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.00066	T
BayesDel_noAF	Benign	-0.16
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.73	D;.;.;.;.;.;.;.;.;.;.
Eigen	Benign	-0.024
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.96	D;.;D;D;.;.;D;.;.;.;D
M_CAP	Uncertain	0.15	D
MetaRNN	Benign	0.38	T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.10	D
MutationAssessor	Benign	0.55	N;.;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	0.67	D;D;D;D;D;D;D
PrimateAI	Benign	0.29	T
PROVEAN	Uncertain	-3.0	D;D;D;D;D;D;D;D;D;D;D
REVEL	Uncertain	0.34
Sift	Benign	0.12	T;T;T;T;T;T;T;D;D;D;D
Sift4G	Uncertain	0.0090	D;D;D;D;D;D;D;T;T;T;T
Polyphen		0.010	B;.;.;B;B;.;P;.;.;.;.
Vest4		0.52
MutPred		0.49		Gain of ubiquitination at K251 (P = 0.0609);.;.;.;.;.;.;.;.;.;.;
MVP		0.62
MPC		0.68
ClinPred		0.76	D
GERP RS		3.6
Varity_R		0.31
gMVP		0.51

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: rs779870576; hg19: chr9-98242853;