19-11013068-G-T

Variant names:

• chr19-11013068-G-T
• rs1555774749
• NM_001387283.1:c.2394G>T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP2 PP3

The NM_003072.5(SMARCA4):​c.2394G>T​(p.Glu798Asp) 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 pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA4 NM_003072.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 3.58

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]

ENSG00000266936 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a domain Helicase ATP-binding (size 165) in uniprot entity SMCA4_HUMAN there are 8 pathogenic changes around while only 0 benign (100%) in NM_003072.5
• 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.758

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.2394G>T	p.Glu798Asp	missense_variant	Exon 17 of 35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.2394G>T	p.Glu798Asp	missense_variant	Exon 16 of 34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.2394G>T	p.Glu798Asp	missense_variant	Exon 17 of 35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.1806G>T	p.Glu602Asp	missense_variant	Exon 13 of 32			ENSP00000496004.1
SMARCA4	ENST00000644963.1	c.1038G>T	p.Glu346Asp	missense_variant	Exon 9 of 28			ENSP00000495599.1
SMARCA4	ENST00000644065.1	c.1119G>T	p.Glu373Asp	missense_variant	Exon 9 of 27			ENSP00000493615.1
SMARCA4	ENST00000642350.1	c.879G>T	p.Glu293Asp	missense_variant	Exon 8 of 27			ENSP00000495355.1
SMARCA4	ENST00000643857.1	c.747G>T	p.Glu249Asp	missense_variant	Exon 7 of 25			ENSP00000494159.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:1

Feb 26, 2024

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 aspartic acid, which is acidic and polar, at codon 798 of the SMARCA4 protein (p.Glu798Asp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. ClinVar contains an entry for this variant (Variation ID: 470306). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SMARCA4 protein function. 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. -

not provided Uncertain:1

May 10, 2024

GeneDx

Significance: Uncertain significance

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; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 24658002) -

Hereditary cancer-predisposing syndrome Uncertain:1

Apr 21, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.E798D variant (also known as c.2394G>T), located in coding exon 15 of the SMARCA4 gene, results from a G to T substitution at nucleotide position 2394. The glutamic acid at codon 798 is replaced by aspartic acid, an amino acid with highly similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Missense and in-frame variants in SMARCA4 are known to cause neurodevelopmental disorders; however, such associations with rhabdoid tumor predisposition syndrome including small cell carcinoma of the ovary-hypercalcemic type (SCCOHT) are exceedingly rare (Kosho T et al. Am J Med Genet C Semin Med Genet. 2014 Sep;166C(3):262-75; Jelinic P et al. Nat Genet. 2014 May;46(5):424-6). 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	Pathogenic	0.60
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.92	D;.;D;.;.;.;.;.;.;.;D;.;.;.;.;.;T;D;.;.;.;.
Eigen	Benign	0.12
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.93	.;D;.;.;.;.;D;.;.;.;D;.;D;D;D;D;D;D;D;D;D;D
M_CAP	Pathogenic	0.51	D
MetaRNN	Pathogenic	0.76	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.41	D
MutationAssessor	Benign	1.6	L;.;.;.;L;L;.;L;L;L;L;L;L;L;L;L;.;.;.;.;.;.
PrimateAI	Pathogenic	0.91	D
PROVEAN	Uncertain	-2.5	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;.;D;.;.;.;.
REVEL	Pathogenic	0.65
Sift	Benign	0.046	D;.;.;.;.;.;.;.;.;.;D;.;T;.;T;.;.;T;.;.;.;.
Sift4G	Benign	0.069	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T;.;.;.;.
Polyphen		0.40	B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;B;.;.;.;.
Vest4		0.78
MutPred		0.53		Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);Loss of methylation at K800 (P = 0.1889);.;Loss of methylation at K800 (P = 0.1889);.;.;.;.;
MVP		0.92
MPC		1.9
ClinPred		0.82	D
GERP RS		2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.66
gMVP		0.87

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs1555774749; hg19: chr19-11123744;