19-10986299-G-T

Variant names:

• chr19-10986299-G-T
• rs954975906
• NM_001387283.1:c.466G>T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_003072.5(SMARCA4):​c.466G>T​(p.Gly156Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCA4 NM_003072.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.43

Genes affected

SMARCA4 (HGNC:11100): (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily a, member 4) The protein encoded by this gene is a member of the SWI/SNF family of proteins and is similar to the brahma protein of Drosophila. Members of this family have helicase and ATPase activities and are thought to regulate transcription of certain genes by altering the chromatin structure around those genes. The encoded protein is part of the large ATP-dependent chromatin remodeling complex SNF/SWI, which is required for transcriptional activation of genes normally repressed by chromatin. In addition, this protein can bind BRCA1, as well as regulate the expression of the tumorigenic protein CD44. Mutations in this gene cause rhabdoid tumor predisposition syndrome type 2. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the SMARCA4 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 59 curated pathogenic missense variants (we use a threshold of 10). The gene has 56 curated benign missense variants. Gene score misZ: 6.8459 (above the threshold of 3.09). Trascript score misZ: 8.7957 (above the threshold of 3.09). GenCC associations: The gene is linked to uterine corpus sarcoma, Coffin-Siris syndrome 1, intellectual disability, autosomal dominant 16, rhabdoid tumor predisposition syndrome 2, familial rhabdoid tumor, hereditary nonpolyposis colon cancer, Coffin-Siris syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.2567082).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.466G>T	p.Gly156Cys	missense_variant	Exon 5 of 35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.466G>T	p.Gly156Cys	missense_variant	Exon 4 of 34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.466G>T	p.Gly156Cys	missense_variant	Exon 5 of 35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.-123G>T		upstream_gene_variant				ENSP00000496004.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:1

Feb 19, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C15"). ClinVar contains an entry for this variant (Variation ID: 646217). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces glycine, which is neutral and non-polar, with cysteine, which is neutral and slightly polar, at codon 156 of the SMARCA4 protein (p.Gly156Cys). -

Hereditary cancer-predisposing syndrome Uncertain:1

May 21, 2020

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.G156C variant (also known as c.466G>T), located in coding exon 3 of the SMARCA4 gene, results from a G to T substitution at nucleotide position 466. The glycine at codon 156 is replaced by cysteine, an amino acid with highly dissimilar properties. This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Uncertain	0.056	T
BayesDel_noAF	Benign	-0.16
CADD	Benign	23
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.76	D;.;T;.;.;.;.;.;.;.;D;.;.;.;.;.;.;T;T
Eigen	Benign	0.035
Eigen_PC	Benign	0.046
FATHMM_MKL	Uncertain	0.86	D
LIST_S2	Uncertain	0.94	.;D;.;.;.;.;D;.;.;.;D;D;.;D;D;D;D;D;D
M_CAP	Pathogenic	0.31	D
MetaRNN	Benign	0.26	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.019	D
MutationAssessor	Benign	0.97	L;.;.;.;L;L;.;L;L;L;L;.;L;L;L;L;L;.;.
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-2.1	N;.;.;.;.;.;.;.;.;.;N;.;.;N;.;N;.;N;N
REVEL	Uncertain	0.34
Sift	Uncertain	0.010	D;.;.;.;.;.;.;.;.;.;D;.;.;D;.;D;.;D;D
Sift4G	Uncertain	0.013	D;.;.;.;.;.;.;.;.;.;D;.;.;D;D;D;D;D;D
Polyphen		0.89	P;.;P;.;.;.;.;.;.;.;P;.;.;.;.;.;.;.;P
Vest4		0.67
MutPred		0.19		Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);
MVP		0.77
MPC		0.61
ClinPred		0.62	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8
Varity_R		0.15
gMVP		0.70

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs954975906; hg19: chr19-11096975;