7-45000368-GC-TT
Variant summary
Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2PP5_Very_Strong
The NM_031443.4(CCM2):c.30+5_30+6delGCinsTT variant causes a splice region, intron 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 Likely pathogenic (★★).
Frequency
Consequence
NM_031443.4 splice_region, intron
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 10 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes Cov.: 24
GnomAD4 genome Cov.: 24
ClinVar
Submissions by phenotype
not provided Pathogenic:3
Non-canonical splice site variant demonstrated to result in loss-of-function (PMID: 21543988, 23595507); This variant is associated with the following publications: (PMID: 23595507, 33729445, 21543988, RicciC2021[Article]) -
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The frequency of this variant in the general population is consistent with pathogenicity (Genome Aggregation Database (gnomAD), Cambridge, MA (URL: http://gnomad.broadinstitute.org)). This variant has been identified in multiple unrelated individuals with clinical features associated with this gene. Assessment of experimental evidence suggests this variant results in abnormal RNA splicing (PMID: 21543988, 23595507). -
Cerebral cavernous malformation 2 Pathogenic:2Other:1
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This sequence change falls in intron 1 of the CCM2 gene. It does not directly change the encoded amino acid sequence of the CCM2 protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or altered protein product. Information on the frequency of this variant in the gnomAD database is not available, as this variant may be reported differently in the database. This variant has been observed in individual(s) with clinical features of cerebral cavernous malformations (PMID: 21543988, 23595507; internal data). ClinVar contains an entry for this variant (Variation ID: 193463). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in activation of a cryptic splice site, and produces a non-functional protein and/or introduces a premature termination codon (PMID: 21543988). For these reasons, this variant has been classified as Pathogenic. -
CCM2-related disorder Pathogenic:1
The CCM2 c.30+5_30+6delinsTT variant is predicted to result in an in-frame deletion and insertion. This variant has been reported as a founder variant in individuals of Ashkenazi Jewish ancestry and functional studies have shown that it affects splicing (Gallione et al. 2011. PubMed ID: 21543988). This variant has not been reported in a large population database, indicating this variant is rare. This variant has been interpreted as pathogenic by multiple submitters in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/193463). Based on this evidence, we interpret this variant as pathogenic. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at