19-10987770-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_001387283.1(SMARCA4):c.964G>T(p.Ala322Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000346 in 1,445,430 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A322T) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: SMARCA4 NM_001387283.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 4.84

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMARCA4
• BP4: Computational evidence support a benign effect (MetaRNN=0.378744).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1	c.964G>T	p.Ala322Ser	missense_variant	6/36	ENST00000646693.2
SMARCA4	NM_003072.5	c.964G>T	p.Ala322Ser	missense_variant	6/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2	c.964G>T	p.Ala322Ser	missense_variant	6/36		NM_001387283.1
SMARCA4	ENST00000344626.10	c.964G>T	p.Ala322Ser	missense_variant	6/35	1	NM_003072.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000477 AC: 1 AN: 209440 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 115518

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000539

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000346 AC: 5 AN: 1445430 Hom.: 0 Cov.: 34 AF XY: 0.00000279 AC XY: 2 AN XY: 717738

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: 0.0000398

Gnomad4 NFE exome AF: 0.00000181

Gnomad4 OTH exome AF: 0.0000168

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Intellectual disability, autosomal dominant 16 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 15, 2021

- -

Rhabdoid tumor predisposition syndrome 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Oct 12, 2023

This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 322 of the SMARCA4 protein (p.Ala322Ser). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. 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: 480684). 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. 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. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 11, 2024

The p.A322S variant (also known as c.964G>T), located in coding exon 5 of the SMARCA4 gene, results from a G to T substitution at nucleotide position 964. The alanine at codon 322 is replaced by serine, 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. Based on the available evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.062	T
BayesDel_noAF	Benign	-0.15
Cadd	Benign	23
Dann	Uncertain	0.99
DEOGEN2	Benign	0.30	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T
Eigen	Benign	0.11
Eigen_PC	Benign	0.11
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Pathogenic	0.43	D
MetaRNN	Benign	0.38	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	-0.036	T
MutationAssessor	Benign	2.0	M;.;.;.;M;M;.;M;M;M;M;M;M;M;M;M;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	-0.98	N;.;.;.;.;.;.;.;.;.;N;.;N;.;N;.;N;N
REVEL	Uncertain	0.41
Sift	Benign	0.14	T;.;.;.;.;.;.;.;.;.;T;.;T;.;T;.;T;T
Sift4G	Benign	0.37	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T
Polyphen		0.92	P;.;D;.;.;.;.;.;.;.;P;.;.;.;.;.;.;D
Vest4		0.46
MutPred		0.15		Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);Gain of glycosylation at A322 (P = 0.0036);
MVP		0.66
MPC		0.86
ClinPred		0.47	T
GERP RS		4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.12
gMVP		0.084

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: rs1060502089; hg19: chr19-11098446;