NM_000264.5:c.67G>T

Variant names:

• chr9-95508295-C-A
• rs863224654
• NM_000264.5:c.67G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000264.5(PTCH1):​c.67G>T​(p.Ala23Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict 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. A23V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.568
• Publications: 2 publications found

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]

PTCH1 Gene-Disease associations (from GenCC):

• basal cell nevus syndrome 1

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• holoprosencephaly 7

  Inheritance: AD Classification: DEFINITIVE, LIMITED Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• nevoid basal cell carcinoma syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, ClinGen, Labcorp Genetics (formerly Invitae), Orphanet
• holoprosencephaly

  Inheritance: AD Classification: LIMITED Submitted by: Illumina

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.18900272).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTCH1	NM_000264.5	c.67G>T	p.Ala23Ser	missense_variant	Exon 1 of 24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.199-1696G>T		intron_variant	Intron 1 of 23	ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.67G>T	p.Ala23Ser	missense_variant	Exon 1 of 24	5	NM_000264.5	ENSP00000332353.6
PTCH1	ENST00000437951.6	c.199-1696G>T		intron_variant	Intron 1 of 23	5	NM_001083603.3	ENSP00000389744.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1364756 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 672660

African (AFR) AF: 0.00 AC: 0 AN: 29454

American (AMR) AF: 0.00 AC: 0 AN: 33514

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23210

East Asian (EAS) AF: 0.00 AC: 0 AN: 33938

South Asian (SAS) AF: 0.00 AC: 0 AN: 75142

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 41594

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4020

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1067464

Other (OTH) AF: 0.00 AC: 0 AN: 56420

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Jul 03, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.A23S variant (also known as c.67G>T), located in coding exon 1 of the PTCH1 gene, results from a G to T substitution at nucleotide position 67. The alanine at codon 23 is replaced by serine, an amino acid with similar properties. This amino acid position is conserved. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.079
BayesDel_addAF	Benign	-0.091	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	15
DANN	Benign	0.85
DEOGEN2	Benign	0.19	T
Eigen	Benign	-0.79
Eigen_PC	Benign	-0.72
FATHMM_MKL	Benign	0.56	D
LIST_S2	Benign	0.47	T
M_CAP	Pathogenic	0.96	D
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-0.69	T
MutationAssessor	Benign	0.0	N
PhyloP100		0.57
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	0.030	N
REVEL	Benign	0.20
Sift	Benign	0.28	T
Sift4G	Benign	0.45	T
Polyphen		0.0	B
Vest4		0.15
MutPred		0.20		Gain of phosphorylation at A23 (P = 0.0057);
MVP		0.22
MPC		0.49
ClinPred		0.095	T
GERP RS		1.6
PromoterAI		-0.0088	Neutral
Varity_R		0.074
gMVP		0.33
Mutation Taster		=84/16	polymorphism

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

Other links and lift over

dbSNP: rs863224654; hg19: chr9-98270577;