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

Genomes: not found (cov: 33)
Exomes 𝑓: 7.0e-7 ( 0 hom. )

Consequence

SMARCB1
NM_003073.5 missense, splice_region

Scores

11
7
1
Splicing: ADA: 1.000
2

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 6.22
Variant links:
Genes affected
SMARCB1 (HGNC:11103): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily b, member 1) The protein encoded by this gene is part of a complex that relieves repressive chromatin structures, allowing the transcriptional machinery to access its targets more effectively. The encoded nuclear protein may also bind to and enhance the DNA joining activity of HIV-1 integrase. This gene has been found to be a tumor suppressor, and mutations in it have been associated with malignant rhabdoid tumors. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2015]

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM1
In a region_of_interest DNA-binding (size 112) in uniprot entity SNF5_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_003073.5
PM2
Very rare variant in population databases, with high coverage;
PP3
MetaRNN computational evidence supports a deleterious effect, 0.885
PP5
Variant 22-23787261-A-T is Pathogenic according to our data. Variant chr22-23787261-A-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 8031.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
SMARCB1NM_003073.5 linkc.92A>T p.Glu31Val missense_variant, splice_region_variant Exon 1 of 9 ENST00000644036.2 NP_003064.2 Q12824-1
SMARCB1NM_001362877.2 linkc.92A>T p.Glu31Val missense_variant, splice_region_variant Exon 1 of 9 NP_001349806.1
SMARCB1NM_001317946.2 linkc.92A>T p.Glu31Val missense_variant, splice_region_variant Exon 1 of 9 NP_001304875.1 G5E975Q9H836
SMARCB1NM_001007468.3 linkc.92A>T p.Glu31Val missense_variant, splice_region_variant Exon 1 of 9 NP_001007469.1 Q12824-2

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
SMARCB1ENST00000644036.2 linkc.92A>T p.Glu31Val missense_variant, splice_region_variant Exon 1 of 9 NM_003073.5 ENSP00000494049.2 Q12824-1

Frequencies

GnomAD3 genomes
Cov.:
33
GnomAD4 exome
AF:
6.96e-7
AC:
1
AN:
1435876
Hom.:
0
Cov.:
27
AF XY:
0.00
AC XY:
0
AN XY:
715416
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.00
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
9.13e-7
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
33

ClinVar

Significance: Conflicting classifications of pathogenicity
Submissions summary: Pathogenic:2Uncertain:2
Revision: criteria provided, conflicting classifications
LINK: link

Submissions by phenotype

not provided Pathogenic:1Uncertain:1
Dec 05, 2022
GeneDx
Significance: Likely pathogenic
Review Status: criteria provided, single submitter
Collection Method: clinical testing

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) -

Nov 18, 2023
Labcorp Genetics (formerly Invitae), Labcorp
Significance: Uncertain significance
Review Status: criteria provided, single submitter
Collection Method: clinical testing

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
Feb 01, 2010
OMIM
Significance: Pathogenic
Review Status: no assertion criteria provided
Collection Method: literature only

- -

Hereditary cancer-predisposing syndrome Uncertain:1
Dec 09, 2024
Ambry Genetics
Significance: Uncertain significance
Review Status: criteria provided, single submitter
Collection Method: clinical testing

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: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
0.99
BayesDel_addAF
Pathogenic
0.49
D
BayesDel_noAF
Pathogenic
0.46
CADD
Pathogenic
35
DANN
Uncertain
0.99
DEOGEN2
Pathogenic
0.81
.;D;T;.;.;T
Eigen
Uncertain
0.53
Eigen_PC
Uncertain
0.45
FATHMM_MKL
Uncertain
0.97
D
LIST_S2
Uncertain
0.92
.;.;.;.;D;D
M_CAP
Pathogenic
0.93
D
MetaRNN
Pathogenic
0.89
D;D;D;D;D;D
MetaSVM
Pathogenic
0.90
D
MutationAssessor
Uncertain
2.5
M;M;.;.;.;.
PrimateAI
Pathogenic
0.86
D
PROVEAN
Pathogenic
-4.8
D;.;D;D;D;D
REVEL
Pathogenic
0.90
Sift
Uncertain
0.0010
D;.;D;D;D;D
Sift4G
Pathogenic
0.0010
D;.;D;D;D;D
Polyphen
0.99, 0.97, 0.61
.;D;D;.;.;P
Vest4
0.73
MutPred
0.58
Gain of MoRF binding (P = 0.0433);Gain of MoRF binding (P = 0.0433);Gain of MoRF binding (P = 0.0433);Gain of MoRF binding (P = 0.0433);Gain of MoRF binding (P = 0.0433);Gain of MoRF binding (P = 0.0433);
MVP
1.0
MPC
2.4
ClinPred
1.0
D
GERP RS
3.2
Varity_R
0.85
gMVP
0.99

Splicing

Name
Calibrated prediction
Score
Prediction
dbscSNV1_ADA
Pathogenic
1.0
dbscSNV1_RF
Pathogenic
1.0
SpliceAI score (max)
0.31
Details are displayed if max score is > 0.2
DS_DG_spliceai
0.31
Position offset: -2

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs267607072; hg19: chr22-24129448; API