NM_000264.5:c.921dupA

Variant names:

• chr9-95480413-C-CT
• rs1554699837
• NM_000264.5:c.921dupA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000264.5(PTCH1):​c.921dupA​(p.Ala308SerfsTer11) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 31)
• Consequence: PTCH1 NM_000264.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.971

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 Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-95480413-C-CT is Pathogenic according to our data. Variant chr9-95480413-C-CT is described in ClinVar as [Pathogenic]. Clinvar id is 453918.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PTCH1	NM_000264.5	c.921dupA	p.Ala308SerfsTer11	frameshift_variant	Exon 6 of 24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.918dupA	p.Ala307SerfsTer11	frameshift_variant	Exon 6 of 24	ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.921dupA	p.Ala308SerfsTer11	frameshift_variant	Exon 6 of 24	5	NM_000264.5	ENSP00000332353.6
PTCH1	ENST00000437951.6	c.918dupA	p.Ala307SerfsTer11	frameshift_variant	Exon 6 of 24	5	NM_001083603.3	ENSP00000389744.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gorlin syndrome Pathogenic:1

Apr 18, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change inserts 1 nucleotide in exon 6 of the PTCH1 mRNA (c.921dupA), causing a frameshift at codon 308. This creates a premature translational stop signal (p.Ala308Serfs*11) and is expected to result in an absent or disrupted protein product. Loss-of-function variants in PTCH1 are known to be pathogenic. This particular variant has been reported in the literature in a family affected with Gorlin syndrome (PMID: 16301862). This variant is also known as codon 307insA in the literature. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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: rs1554699837; hg19: chr9-98242695;