NM_001387283.1:c.1207G>A

Variant names:

• chr19-10989405-G-A
• rs1555756388
• NM_001387283.1:c.1207G>A

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001387283.1(SMARCA4):​c.1207G>A​(p.Glu403Lys) variant causes a missense change involving the alteration of a 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_001387283.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 9.94

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 5 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.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.843

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.1207G>A	p.Glu403Lys	missense_variant	Exon 8 of 35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.1207G>A	p.Glu403Lys	missense_variant	Exon 7 of 34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.1207G>A	p.Glu403Lys	missense_variant	Exon 8 of 35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.619G>A	p.Glu207Lys	missense_variant	Exon 4 of 32			ENSP00000496004.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

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

Apr 22, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is not present in population databases (gnomAD no frequency). 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 537828). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 403 of the SMARCA4 protein (p.Glu403Lys). -

Hereditary cancer-predisposing syndrome Uncertain:1

Sep 19, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.E403K variant (also known as c.1207G>A), located in coding exon 6 of the SMARCA4 gene, results from a G to A substitution at nucleotide position 1207. The glutamic acid at codon 403 is replaced by lysine, an amino acid with 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). Based on the supporting evidence, the association of this alteration with Coffin-Siris syndrome is unknown; however, the association of this alteration with rhabdoid tumor predisposition syndrome is unlikely. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.87	D;.;T;.;.;.;.;.;.;.;D;.;.;.;.;.;T;T
Eigen	Pathogenic	0.83
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Pathogenic	1.0	.;D;.;.;.;.;D;.;.;.;D;.;D;D;D;D;D;D
M_CAP	Pathogenic	0.42	D
MetaRNN	Pathogenic	0.84	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	-0.24	T
MutationAssessor	Benign	2.0	M;.;.;.;M;M;.;M;M;M;M;M;M;M;M;M;.;.
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-3.8	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D
REVEL	Uncertain	0.55
Sift	Uncertain	0.0010	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D
Sift4G	Uncertain	0.0030	D;.;.;.;.;.;.;.;.;.;D;.;D;D;D;D;D;D
Polyphen		1.0	D;.;D;.;.;.;.;.;.;.;D;.;.;.;.;.;.;D
Vest4		0.89
MutPred		0.61		Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);Gain of MoRF binding (P = 0.0075);
MVP		0.79
MPC		2.5
ClinPred		1.0	D
GERP RS		4.1
Varity_R		0.90
gMVP		1.0

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: rs1555756388; hg19: chr19-11100081; COSMIC: COSV60792092; COSMIC: COSV60792092;