rs878853849
Variant summary
Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PVS1PM2PP3_StrongPP5
The NM_000264.5(PTCH1):c.202-2A>G variant causes a splice acceptor change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/2 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Genomes: not found (cov: 32)
Consequence
PTCH1
NM_000264.5 splice_acceptor
NM_000264.5 splice_acceptor
Scores
4
2
1
Splicing: ADA: 1.000
2
Clinical Significance
Conservation
PhyloP100: 7.39
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]
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ACMG classification
Classification made for transcript
Verdict is Pathogenic. Variant got 15 ACMG points.
PVS1
?
Splicing variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
?
Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. No scorers claiming Benign.
PP5
?
Variant 9-95506601-T-C is Pathogenic according to our data. Variant chr9-95506601-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 237465.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=3, Uncertain_significance=1}. Variant chr9-95506601-T-C is described in Lovd as [Likely_pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
PTCH1 | NM_000264.5 | c.202-2A>G | splice_acceptor_variant | ENST00000331920.11 | |||
PTCH1 | NM_001083603.3 | c.199-2A>G | splice_acceptor_variant | ENST00000437951.6 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
PTCH1 | ENST00000331920.11 | c.202-2A>G | splice_acceptor_variant | 5 | NM_000264.5 | A2 | |||
PTCH1 | ENST00000437951.6 | c.199-2A>G | splice_acceptor_variant | 5 | NM_001083603.3 | ||||
ENST00000604104.1 | n.367T>C | non_coding_transcript_exon_variant | 1/1 |
Frequencies
GnomAD3 genomes ? Cov.: 32
GnomAD3 genomes
?
Cov.:
32
GnomAD4 exome Cov.: 31
GnomAD4 exome
Cov.:
31
GnomAD4 genome ? Cov.: 32
GnomAD4 genome
?
Cov.:
32
ClinVar
Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:3Uncertain:1
Revision: criteria provided, conflicting classifications
LINK: link
Submissions by phenotype
Gorlin syndrome Pathogenic:1Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | St. Jude Molecular Pathology, St. Jude Children's Research Hospital | Jan 03, 2022 | The PTCH1 c.202-2A>G intronic change results from an A to G substitution at the -2 position of intron 1 of the PTCH1 gene. This variant disrupts the native splice site at c.202 resulting in out-of-frame alternative splicing between exons 1 and 3 and skipping of exon 2. This variant has been reported in individuals with nevoid basal cell carcinoma syndrome (PMID: 29575684, 28328109). It has also been identified in an individual with a SHH-medulloblastoma with an increased variant allele frequency in the tumor (internal data). This variant is absent in gnomAD v2.1.1 (https://gnomad.broadinstitute.org/). In summary, this variant meets criteria to be classified as pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Sep 19, 2023 | Disruption of this splice site has been observed in individuals with clinical features of basal cell nevus syndrome (PMID: 29575684; Invitae). This sequence change affects an acceptor splice site in intron 1 of the PTCH1 gene. It is expected to disrupt RNA splicing. Variants that disrupt the donor or acceptor splice site typically lead to a loss of protein function (PMID: 16199547), and loss-of-function variants in PTCH1 are known to be pathogenic (PMID: 16301862, 16419085). This variant is not present in population databases (gnomAD no frequency). ClinVar contains an entry for this variant (Variation ID: 237465). 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. - |
not provided Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | GeneDx | Jun 01, 2022 | Canonical splice site variant predicted to result in a null allele in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29575684, 28328109) - |
Hereditary cancer-predisposing syndrome Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Sep 25, 2019 | The c.202-2A>G intronic pathogenic mutation results from an A to G substitution two nucleotides upstream from coding exon 2 in the PTCH1 gene. This alteration has been reported in a cohort of patients referred for testing for nevoid basal cell carcinoma syndrome (NBCCS) (Reinders MG et al. Mol Genet Genomic Med. 2018 05;6:409-415). Using the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to abolish the native splice acceptor site; however, direct evidence is unavailable. In addition to the clinical data presented in the literature, alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. As such, this alteration is classified as a disease-causing mutation. - |
Computational scores
Source:
Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Uncertain
Cadd
Pathogenic
Dann
Uncertain
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
MutationTaster
Benign
D;D;D;D;D;D;D;D
GERP RS
Splicing
Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
DS_AL_spliceai
Position offset: -2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at