chr19-11058822-A-G

Position:

• chr19-11058822-A-G

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP2 BP4_Strong

The NM_003072.5(SMARCA4):​c.4568A>G​(p.Asn1523Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,850 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SMARCA4 NM_003072.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 0.604

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]

SMARCA4 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SMARCA4. . Gene score misZ 6.8459 (greater than the threshold 3.09). Trascript score misZ 8.7957 (greater than threshold 3.09). GenCC has associacion of gene with 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=0.03232026).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.4664A>G	p.Asn1555Ser	missense_variant	33/36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.4568A>G	p.Asn1523Ser	missense_variant	32/35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.4664A>G	p.Asn1555Ser	missense_variant	33/36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.4568A>G	p.Asn1523Ser	missense_variant	32/35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.4574A>G	p.Asn1525Ser	missense_variant	32/35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.4478A>G	p.Asn1493Ser	missense_variant	32/35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.4478A>G	p.Asn1493Ser	missense_variant	31/34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.4478A>G	p.Asn1493Ser	missense_variant	31/34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.4475A>G	p.Asn1492Ser	missense_variant	32/35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.3989A>G	p.Asn1330Ser	missense_variant	29/32			ENSP00000496004.1
SMARCA4	ENST00000644963.1	c.3218A>G	p.Asn1073Ser	missense_variant	25/28			ENSP00000495599.1
SMARCA4	ENST00000644065.1	c.3200A>G	p.Asn1067Ser	missense_variant	24/27			ENSP00000493615.1
SMARCA4	ENST00000642350.1	c.3062A>G	p.Asn1021Ser	missense_variant	24/27			ENSP00000495355.1
SMARCA4	ENST00000643857.1	c.2895+459A>G		intron_variant				ENSP00000494159.1
SMARCA4	ENST00000538456.4	c.699+459A>G		intron_variant		3		ENSP00000495197.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461850 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727226

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: 0.00

Gnomad4 OTH exome AF: 0.0000166

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 27, 2023

This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 1555 of the SMARCA4 protein (p.Asn1555Ser). 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: 470413). 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) performed at Invitae indicates that this missense variant is not expected to disrupt SMARCA4 protein function with a negative predictive value of 95%. 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

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Sep 26, 2022

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge; Also known as p.(N1523S), c.4568A>G; This variant is associated with the following publications: (PMID: 24658002) -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 16, 2020

The p.N1555S variant (also known as c.4664A>G), located in coding exon 32 of the SMARCA4 gene, results from an A to G substitution at nucleotide position 4664. The asparagine at codon 1555 is replaced by serine, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. 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	0.057
BayesDel_addAF	Benign	-0.29	T
BayesDel_noAF	Benign	-0.65
CADD	Benign	13
DANN	Benign	0.41
DEOGEN2	Benign	0.16	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T;.;.;.;.;.
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.021	N
LIST_S2	Benign	0.80	.;T;.;.;.;.;T;.;.;.;T;.;T;T;T;T;T;T;T;T;T;T;T
M_CAP	Benign	0.0086	T
MetaRNN	Benign	0.032	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.36	N;.;.;.;.;.;.;.;.;.;N;.;.;.;.;.;.;.;.;.;.;.;.
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-0.70	N;.;.;.;.;.;.;.;.;.;N;.;.;.;N;.;.;.;.;.;.;.;.
REVEL	Benign	0.027
Sift	Benign	0.67	T;.;.;.;.;.;.;.;.;.;T;.;.;.;T;.;.;.;.;.;.;.;.
Sift4G	Benign	0.59	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T;.;.;.;.;.
Polyphen		0.0	B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;B;.;.;.;.;.
Vest4		0.17
MutPred		0.24		.;.;Gain of phosphorylation at N1555 (P = 0.036);.;.;.;.;.;.;.;.;.;.;.;.;.;.;Gain of phosphorylation at N1555 (P = 0.036);.;.;.;.;.;
MVP		0.31
MPC		0.79
ClinPred		0.045	T
GERP RS		0.31
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.21
gMVP		0.63

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: rs1555795360; hg19: chr19-11169498;