chr22-23787261-A-T
Variant summary
Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PM2PP3_ModeratePP5
The NM_003073.5(SMARCB1):c.92A>T(p.Glu31Val) variant causes a missense, splice region change. The variant allele was found at a frequency of 0.000000696 in 1,435,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).
Frequency
Consequence
NM_003073.5 missense, splice_region
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Likely_pathogenic. Variant got 7 ACMG points.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | Exon rank | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
SMARCB1 | NM_003073.5 | c.92A>T | p.Glu31Val | missense_variant, splice_region_variant | Exon 1 of 9 | ENST00000644036.2 | NP_003064.2 | |
SMARCB1 | NM_001362877.2 | c.92A>T | p.Glu31Val | missense_variant, splice_region_variant | Exon 1 of 9 | NP_001349806.1 | ||
SMARCB1 | NM_001317946.2 | c.92A>T | p.Glu31Val | missense_variant, splice_region_variant | Exon 1 of 9 | NP_001304875.1 | ||
SMARCB1 | NM_001007468.3 | c.92A>T | p.Glu31Val | missense_variant, splice_region_variant | Exon 1 of 9 | NP_001007469.1 |
Ensembl
Frequencies
GnomAD3 genomes Cov.: 33
GnomAD4 exome AF: 6.96e-7 AC: 1AN: 1435876Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0AN XY: 715416
GnomAD4 genome Cov.: 33
ClinVar
Submissions by phenotype
not provided Pathogenic:1Uncertain:1
Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; In silico analysis suggests this variant may impact gene splicing. In the absence of RNA/functional studies, the actual effect of this sequence change is unknown.; Published functional studies suggest this variant likely results in a nulle allele (Bacci et al., 2010); This variant is associated with the following publications: (PMID: 26073604, 31586052, 19582488) -
This sequence change replaces glutamic acid, which is acidic and polar, with valine, which is neutral and non-polar, at codon 31 of the SMARCB1 protein (p.Glu31Val). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with schwannomatosis (PMID: 19582488, 22434358). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 8031). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. Studies have shown that this missense change alters SMARCB1 gene expression (PMID: 19582488). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. 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. -
SMARCB1-related schwannomatosis Pathogenic:1
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Hereditary cancer-predisposing syndrome Uncertain:1
The p.E31V variant (also known as c.92A>T), located in coding exon 1 of the SMARCB1 gene, results from an A to T substitution at nucleotide position 92. The glutamic acid at codon 31 is replaced by valine, an amino acid with dissimilar properties. This variant was identified in one or more individuals with features consistent with schwannomatosis and segregated with disease in at least one family (Bacci C et al. Neurogenetics, 2010 Feb;11:73-80). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at