rs786203245
Variant summary
Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2_SupportingPVS1_Moderate
This summary comes from the ClinGen Evidence Repository: The c.49-2A>T variant in PALB2 occurs within the canonical splice acceptor site (-1,2) of intron 1. The computational splicing predictor SpliceAI gives a score of 0.97 for acceptor loss and 0.71 score for an acceptor gain, predicting that the variant disrupts the acceptor splice site. This alteration is predicted to result in an in-frame loss impacting two amino acids from of exon 2 in the coiled-coiled domain with unknown functional impact (PMID:30890586, 30289697, 31159747, Ambry Genetics). This variant is absent in gnomAD v2.1.1. In summary, this variant meets the criteria to be classified as a variant of uncertain significance for autosomal dominant hereditary breast and pancreatic cancer and autosomal recessive FANCN based on the ACMG/AMP criteria applied, as specified by the HBOP VCEP. (PVS1_Moderate, PM2_Supporting) LINK:https://erepo.genome.network/evrepo/ui/classification/CA195965/MONDO:0016419/020
Frequency
Consequence
NM_024675.4 splice_acceptor, intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Uncertain_significance. Variant got 3 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
PALB2 | NM_024675.4 | c.49-2A>T | splice_acceptor_variant, intron_variant | ENST00000261584.9 | NP_078951.2 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
PALB2 | ENST00000261584.9 | c.49-2A>T | splice_acceptor_variant, intron_variant | 1 | NM_024675.4 | ENSP00000261584.4 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD4 exome AF: 6.84e-7 AC: 1AN: 1461168Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0AN XY: 726952
GnomAD4 genome Cov.: 32
ClinVar
Submissions by phenotype
Familial cancer of breast Pathogenic:2Uncertain:3
Uncertain significance, reviewed by expert panel | curation | ClinGen Hereditary Breast, Ovarian and Pancreatic Cancer Variant Curation Expert Panel, ClinGen | Apr 05, 2023 | The c.49-2A>T variant in PALB2 occurs within the canonical splice acceptor site (-1,2) of intron 1. The computational splicing predictor SpliceAI gives a score of 0.97 for acceptor loss and 0.71 score for an acceptor gain, predicting that the variant disrupts the acceptor splice site. This alteration is predicted to result in an in-frame loss impacting two amino acids from of exon 2 in the coiled-coiled domain with unknown functional impact (PMID: 30890586, 30289697, 31159747, Ambry Genetics). This variant is absent in gnomAD v2.1.1. In summary, this variant meets the criteria to be classified as a variant of uncertain significance for autosomal dominant hereditary breast and pancreatic cancer and autosomal recessive FANCN based on the ACMG/AMP criteria applied, as specified by the HBOP VCEP. (PVS1_Moderate, PM2_Supporting) - |
Likely pathogenic, criteria provided, single submitter | clinical testing | Counsyl | Feb 06, 2018 | - - |
Likely pathogenic, no assertion criteria provided | curation | Leiden Open Variation Database | May 13, 2019 | Curators: Marc Tischkowitz, Arleen D. Auerbach. Submitter to LOVD: Marc Tischkowitz. - |
Uncertain significance, criteria provided, single submitter | clinical testing | MGZ Medical Genetics Center | May 27, 2022 | - - |
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Oct 04, 2023 | This sequence change affects an acceptor splice site in intron 1 of the PALB2 gene. RNA analysis indicates that disruption of this splice site induces altered splicing and likely results in a shortened protein product. This variant is not present in population databases (gnomAD no frequency). Disruption of this splice site has been observed in individual(s) with PALB2-related conditions (PMID: 25452441, 29478780). ClinVar contains an entry for this variant (Variation ID: 186820). Studies have shown disruption of this splice site is associated with skipping of 2 amino acids, but one or more of the resulting mRNA isoform(s) may be naturally occurring (PMID: 30890586, 34846068). 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. - |
Hereditary cancer-predisposing syndrome Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | May 03, 2024 | The c.49-2A>T intronic variant results from an A to T substitution two nucleotides upstream from coding exon 2 in the PALB2 gene. This alteration was identified in 1/1824 triple-negative breast cancer patients unselected for family history of breast or ovarian cancer (Couch FJ et al. J. Clin. Oncol. 2015 Feb; 33(4):304-11). This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice acceptor site and will result in the creation or strengthening of a novel splice acceptor site. Usage of this novel acceptor site would result in an in-frame transcript lacking two highly conserved amino acids in the coiled-coiled domain and is predicted to significantly disrupt a protein-protein interface (Ambry internal data). RNA studies have demonstrated that this alteration results in abnormal splicing in the set of samples tested (Ambry internal data; Valenzuela-Palomo A et al. J Pathol, 2022 Mar;256:321-334). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Based on the majority of available evidence to date, this variant is likely to be pathogenic. - |
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | Dec 14, 2023 | Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 25452441, 29478780, 30128536, 34846068, 30890586) - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at