19-10986548-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001387283.1(SMARCA4):c.715G>T(p.Gly239Cys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. 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. G239S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SMARCA4 NM_001387283.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.59

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 Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMARCA4

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1	c.715G>T	p.Gly239Cys	missense_variant	4/36	ENST00000646693.2
SMARCA4	NM_003072.5	c.715G>T	p.Gly239Cys	missense_variant	4/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2	c.715G>T	p.Gly239Cys	missense_variant	4/36		NM_001387283.1
SMARCA4	ENST00000344626.10	c.715G>T	p.Gly239Cys	missense_variant	4/35	1	NM_003072.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1387604 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 684870

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: 0.00

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

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Apr 06, 2021

This sequence change replaces glycine with cysteine at codon 239 of the SMARCA4 protein (p.Gly239Cys). The glycine residue is highly conserved and there is a large physicochemical difference between glycine and cysteine. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. 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 are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with SMARCA4-related conditions. ClinVar contains an entry for this variant (Variation ID: 826871). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 21, 2018

The p.G239C variant (also known as c.715G>T), located in coding exon 3 of the SMARCA4 gene, results from a G to T substitution at nucleotide position 715. The glycine at codon 239 is replaced by cysteine, an amino acid with highly dissimilar properties. This nucleotide position is highly conserved in available vertebrate species. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. 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	0.13
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
Cadd	Uncertain	24
Dann	Uncertain	0.99
DEOGEN2	Uncertain	0.43	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T
Eigen	Uncertain	0.27
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Pathogenic	0.30	D
MetaRNN	Uncertain	0.65	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.47	D
MutationAssessor	Benign	1.7	L;.;.;.;L;L;.;L;L;L;L;L;L;L;L;L;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-1.7	N;.;.;.;.;.;.;.;.;.;N;.;N;.;N;.;N;N
REVEL	Uncertain	0.62
Sift	Uncertain	0.0050	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D
Sift4G	Uncertain	0.012	D;.;.;.;.;.;.;.;.;.;D;.;D;D;D;D;D;D
Polyphen		1.0	D;.;D;.;.;.;.;.;.;.;D;.;.;.;.;.;.;D
Vest4		0.49
MutPred		0.32		Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);Gain of catalytic residue at P238 (P = 0.0499);
MVP		0.87
MPC		0.83
ClinPred		0.86	D
GERP RS		4.5
Varity_R		0.29
gMVP		0.39

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: rs761515593; hg19: chr19-11097224;