rs1554688752

Positions:

• chr9-95447445-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000264.5(PTCH1):​c.3811C>T​(p.His1271Tyr) variant causes a missense change. The variant allele was found at a frequency of 0.000000698 in 1,432,596 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.0e-7 (0 hom.)
• Consequence: PTCH1 NM_000264.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.99

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=0.16740254).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PTCH1	NM_000264.5	c.3811C>T	p.His1271Tyr	missense_variant	23/24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.3808C>T	p.His1270Tyr	missense_variant	23/24	ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.3811C>T	p.His1271Tyr	missense_variant	23/24	5	NM_000264.5	ENSP00000332353	A2
PTCH1	ENST00000437951.6	c.3808C>T	p.His1270Tyr	missense_variant	23/24	5	NM_001083603.3	ENSP00000389744

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.98e-7 AC: 1 AN: 1432596 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 710608

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: 9.09e-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

Gorlin syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 26, 2017

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with PTCH1-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces histidine with tyrosine at codon 1271 of the PTCH1 protein (p.His1271Tyr). The histidine residue is weakly conserved and there is a moderate physicochemical difference between histidine and tyrosine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.0079	T
BayesDel_noAF	Benign	-0.25
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.27	T;.;.;.;.;.;.
Eigen	Benign	-0.11
Eigen_PC	Benign	0.090
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.89	D;.;D;D;.;.;D
M_CAP	Benign	0.056	D
MetaRNN	Benign	0.17	T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.20	T
MutationAssessor	Benign	1.6	L;.;.;.;.;.;.
MutationTaster	Benign	0.57	D;D;D;D;D;D;D
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-0.62	N;N;N;N;N;N;N
REVEL	Uncertain	0.32
Sift	Benign	0.050	D;T;T;T;T;T;T
Sift4G	Uncertain	0.038	D;T;T;T;T;T;D
Polyphen		0.021	B;.;.;B;B;.;B
Vest4		0.33
MutPred		0.20		Gain of phosphorylation at H1271 (P = 0.0405);.;.;.;.;.;.;
MVP		0.43
MPC		0.094
ClinPred		0.74	D
GERP RS		4.9
Varity_R		0.16
gMVP		0.23

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1554688752; hg19: chr9-98209727;