rs776424978

chr9-95506440-G-Achr9-95506440-G-Cchr9-95506440-G-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.361C>T(p.Leu121Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,434 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. L121V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • 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: 2.77

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 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=0.33656204).
• BP6: Variant 9-95506440-G-A is Benign according to our data. Variant chr9-95506440-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 453857.We mark this variant Likely_benign, oryginal submissions are: {Benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PTCH1	NM_000264.5	c.361C>T	p.Leu121Phe	missense_variant	2/24	ENST00000331920.11
PTCH1	NM_001083603.3	c.358C>T	p.Leu120Phe	missense_variant	2/24	ENST00000437951.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PTCH1	ENST00000331920.11	c.361C>T	p.Leu121Phe	missense_variant	2/24	5	NM_000264.5	A2
PTCH1	ENST00000437951.6	c.358C>T	p.Leu120Phe	missense_variant	2/24	5	NM_001083603.3
	ENST00000604104.1	n.206G>A		non_coding_transcript_exon_variant	1/1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000400 AC: 1 AN: 249998 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135362

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000546

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: 1460434 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726502

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

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

Feb 25, 2024

The p.L121F variant (also known as c.361C>T), located in coding exon 2 of the PTCH1 gene, results from a C to T substitution at nucleotide position 361. The leucine at codon 121 is replaced by phenylalanine, an amino acid with highly similar properties. This amino acid position is highly conserved in available vertebrate species. 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

Benign, criteria provided, single submitter

clinical testing

Invitae

Dec 06, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Benign	0.0016	T
BayesDel_noAF	Uncertain	-0.070
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Benign	0.40	T;.;.;.;.
Eigen	Uncertain	0.20
Eigen_PC	Uncertain	0.28
FATHMM_MKL	Uncertain	0.79	D
LIST_S2	Uncertain	0.95	D;D;.;D;D
M_CAP	Pathogenic	0.32	D
MetaRNN	Benign	0.34	T;T;T;T;T
MetaSVM	Uncertain	0.43	D
MutationAssessor	Benign	1.7	L;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-2.1	N;N;N;N;N
REVEL	Uncertain	0.43
Sift	Benign	0.049	D;D;D;T;T
Sift4G	Uncertain	0.0090	D;D;D;D;D
Polyphen		0.23	B;B;B;D;.
Vest4		0.56
MutPred		0.27		Loss of ubiquitination at K117 (P = 0.0997);.;.;.;.;
MVP		0.41
MPC		0.75
ClinPred		0.76	D
GERP RS		4.7
Varity_R		0.72
gMVP		0.61

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: rs776424978; hg19: chr9-98268722; COSMIC: COSV59482359; COSMIC: COSV59482359;