chr9-95508252-C-A

Position:

• chr9-95508252-C-A

Variant summary

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

The NM_000264.5(PTCH1):​c.110G>T​(p.Gly37Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,449,742 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 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. G37R) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.40

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 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=0.27271098).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PTCH1	NM_000264.5	c.110G>T	p.Gly37Val	missense_variant	1/24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.199-1653G>T		intron_variant		ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.110G>T	p.Gly37Val	missense_variant	1/24	5	NM_000264.5	ENSP00000332353	A2
PTCH1	ENST00000437951.6	c.199-1653G>T		intron_variant		5	NM_001083603.3	ENSP00000389744

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1449742 Hom.: 0 Cov.: 34 AF XY: 0.00000139 AC XY: 1 AN XY: 720720

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 9.02e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 11, 2020

The p.G37V variant (also known as c.110G>T), located in coding exon 1 of the PTCH1 gene, results from a G to T substitution at nucleotide position 110. The glycine at codon 37 is replaced by valine, an amino acid with dissimilar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.056	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	16
DANN	Benign	0.86
DEOGEN2	Benign	0.23	T
Eigen	Benign	-0.90
Eigen_PC	Benign	-0.88
FATHMM_MKL	Benign	0.64	D
LIST_S2	Benign	0.65	T
M_CAP	Pathogenic	0.94	D
MetaRNN	Benign	0.27	T
MetaSVM	Benign	-0.60	T
MutationAssessor	Benign	1.1	L
MutationTaster	Benign	1.0	D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-0.65	N
REVEL	Benign	0.23
Sift	Benign	0.13	T
Sift4G	Benign	0.16	T
Polyphen		0.0	B
Vest4		0.14
MutPred		0.25		Gain of sheet (P = 0.0166);
MVP		0.44
MPC		1.6
ClinPred		0.18	T
GERP RS		-0.36
Varity_R		0.052
gMVP		0.54

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: chr9-98270534;