rs766237791

chr19-11007950-G-Achr19-11007950-G-C

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 1P and 2B. PP2 BP4_Moderate

The NM_001387283.1(SMARCA4):c.2050G>A(p.Val684Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000123 in 1,461,436 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V684A) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: SMARCA4 NM_001387283.1 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:1
• Conservation: PhyloP100: 3.59

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 Likely_benign. Variant got -1 ACMG points.

• PP2: Missense variant where missense usually causes diseases, SMARCA4
• BP4: Computational evidence support a benign effect (MetaRNN=0.105905086).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1	c.2050G>A	p.Val684Met	missense_variant	14/36	ENST00000646693.2
SMARCA4	NM_003072.5	c.2050G>A	p.Val684Met	missense_variant	14/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2	c.2050G>A	p.Val684Met	missense_variant	14/36		NM_001387283.1
SMARCA4	ENST00000344626.10	c.2050G>A	p.Val684Met	missense_variant	14/35	1	NM_003072.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000159 AC: 4 AN: 251196 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135778

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000123 AC: 18 AN: 1461436 Hom.: 0 Cov.: 31 AF XY: 0.00000963 AC XY: 7 AN XY: 727020

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000224

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: 0.0000135

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000313 Hom.: 0

Bravo AF: 0.0000113

ExAC AF: 0.0000165 AC: 2

EpiCase AF: 0.00

EpiControl AF: 0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Jun 24, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Dec 08, 2023	This sequence change replaces valine, which is neutral and non-polar, with methionine, which is neutral and non-polar, at codon 684 of the SMARCA4 protein (p.Val684Met). This variant is present in population databases (rs766237791, gnomAD 0.007%). 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: 470276). 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. -

Intellectual disability, autosomal dominant 16 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 15, 2021

- -

Hereditary cancer-predisposing syndrome Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 09, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.16	T
BayesDel_noAF	Benign	-0.29
Cadd	Uncertain	23
Dann	Uncertain	0.99
DEOGEN2	Benign	0.27	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T;.;.;.
Eigen	Benign	-0.46
Eigen_PC	Benign	-0.26
FATHMM_MKL	Pathogenic	0.97	D
M_CAP	Benign	0.059	D
MetaRNN	Benign	0.11	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.51	T
MutationAssessor	Benign	0.55	N;.;.;.;N;N;.;N;N;N;N;N;N;N;N;N;.;.;.;.;.
MutationTaster	Benign	0.95	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-0.52	N;.;.;.;.;.;.;.;.;.;N;.;N;.;N;.;.;N;.;.;.
REVEL	Benign	0.16
Sift	Benign	0.13	T;.;.;.;.;.;.;.;.;.;T;.;T;.;T;.;.;T;.;.;.
Sift4G	Benign	0.22	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T;.;.;.
Polyphen		0.084	B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;B;.;.;.
Vest4		0.34
MutPred		0.17		Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);Gain of glycosylation at P683 (P = 0.0806);.;Gain of glycosylation at P683 (P = 0.0806);.;.;.;
MVP		0.65
MPC		1.3
ClinPred		0.059	T
GERP RS		3.5
RBP_binding_hub_radar		0.97
RBP_regulation_power_radar		2.8
Varity_R		0.034
gMVP		0.61

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: rs766237791; hg19: chr19-11118626;