chr19-10987856-C-A

Variant names:

• chr19-10987856-C-A
• rs777628688
• NM_001387283.1:c.1050C>A

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 1P and 11B. PP2 BP4_Moderate BP6 BS1 BS2

The NM_003072.5(SMARCA4):​c.1050C>A​(p.Ser350Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000062 in 1,612,228 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: SMARCA4 NM_003072.5 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3 B:3
• Conservation: PhyloP100: 1.31

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 Benign. Variant got -10 ACMG points.

• 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.
• BP4: Computational evidence support a benign effect (MetaRNN=0.08660266).
• BP6: Variant 19-10987856-C-A is Benign according to our data. Variant chr19-10987856-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 408678.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=2, Uncertain_significance=3}.
• BS1: Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.00000548 (8/1460030) while in subpopulation AMR AF= 0.000179 (8/44626). AF 95% confidence interval is 0.0000888. There are 0 homozygotes in gnomad4_exome. There are 6 alleles in male gnomad4_exome subpopulation. Median coverage is 34. This position pass quality control queck.
• BS2: High AC in GnomAdExome4 at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.1050C>A	p.Ser350Arg	missense_variant	Exon 7 of 35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.1050C>A	p.Ser350Arg	missense_variant	Exon 6 of 34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.1050C>A	p.Ser350Arg	missense_variant	Exon 7 of 35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.462C>A	p.Ser154Arg	missense_variant	Exon 3 of 32			ENSP00000496004.1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152198 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000460 AC: 11 AN: 239202 Hom.: 0 AF XY: 0.0000611 AC XY: 8 AN XY: 130940

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000293

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: 0.00

Gnomad OTH exome AF: 0.000170

GnomAD4 exome AF: 0.00000548 AC: 8 AN: 1460030 Hom.: 0 Cov.: 34 AF XY: 0.00000826 AC XY: 6 AN XY: 726274

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000179

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 AF: 0.0000131 AC: 2 AN: 152198 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74350

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000408 Hom.: 0

Bravo AF: 0.0000378

ExAC AF: 0.0000744 AC: 9

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:2

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces serine, which is neutral and polar, with arginine, which is basic and polar, at codon 350 of the SMARCA4 protein (p.Ser350Arg). This variant is present in population databases (rs777628688, gnomAD 0.02%). 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: 408678). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed for this missense variant. However, the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on 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. -

Mar 04, 2024

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Nov 09, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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 -

Intellectual disability, autosomal dominant 16 Benign:1

Jul 15, 2021

Genome-Nilou Lab

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary cancer-predisposing syndrome Benign:1

Dec 26, 2023

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as 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. -

Coffin-Siris syndrome Benign:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.23
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.39	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T
Eigen	Benign	-0.44
Eigen_PC	Benign	-0.31
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.91	.;D;.;.;.;.;D;.;.;.;D;.;D;D;D;D;D;D
M_CAP	Uncertain	0.27	D
MetaRNN	Benign	0.087	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.46	T
MutationAssessor	Benign	0.55	N;.;.;.;N;N;.;N;N;N;N;N;N;N;N;N;.;.
PrimateAI	Pathogenic	0.79	T
PROVEAN	Benign	-1.4	N;.;.;.;.;.;.;.;.;.;N;.;N;.;N;.;N;N
REVEL	Benign	0.28
Sift	Benign	0.36	T;.;.;.;.;.;.;.;.;.;T;.;T;.;T;.;T;T
Sift4G	Benign	0.25	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T
Polyphen		0.42	B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;B
Vest4		0.49
MutPred		0.27		Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);Loss of glycosylation at S350 (P = 0.0164);
MVP		0.60
MPC		0.39
ClinPred		0.055	T
GERP RS		2.1
Varity_R		0.18
gMVP		0.44

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: rs777628688; hg19: chr19-11098532;