rs1554698774

Variant names:

• chr9-95478054-CCAT-C
• rs1554698774
• NM_000264.5:c.1345_1347delATG

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PM4_Supporting PP3_Moderate PP5_Moderate

The NM_000264.5(PTCH1):​c.1345_1347delATG​(p.Met449del) variant causes a conservative inframe deletion, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: PTCH1 NM_000264.5 conservative_inframe_deletion, splice_region
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.95

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 Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a helix (size 18) in uniprot entity PTC1_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_000264.5
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_000264.5. Strenght limited to Supporting due to length of the change: 1aa.
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.
• PP5: Variant 9-95478054-CCAT-C is Pathogenic according to our data. Variant chr9-95478054-CCAT-C is described in ClinVar as [Pathogenic]. Clinvar id is 524557.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.1345_1347delATG	p.Met449del	conservative_inframe_deletion, splice_region_variant	Exon 9 of 24	ENST00000331920.11	NP_000255.2
PTCH1	NM_001083603.3	c.1342_1344delATG	p.Met448del	conservative_inframe_deletion, splice_region_variant	Exon 9 of 24	ENST00000437951.6	NP_001077072.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PTCH1	ENST00000331920.11	c.1345_1347delATG	p.Met449del	conservative_inframe_deletion, splice_region_variant	Exon 9 of 24	5	NM_000264.5	ENSP00000332353.6
PTCH1	ENST00000437951.6	c.1342_1344delATG	p.Met448del	conservative_inframe_deletion, splice_region_variant	Exon 9 of 24	5	NM_001083603.3	ENSP00000389744.2

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Gorlin syndrome Pathogenic:1

Mar 04, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant, c.1345_1347del, results in the deletion of 1 amino acid(s) of the PTCH1 protein (p.Met449del), but otherwise preserves the integrity of the reading frame. This variant also falls at the last nucleotide of exon 9, which is part of the consensus splice site for this exon. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with clinical features consistent with Gorlin syndrome and/or Gorlin syndrome (Invitae). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 524557). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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)		1.0		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.56		Position offset: 4
DS_DL_spliceai		1.0		Position offset: 1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1554698774; hg19: chr9-98240336;