19-10987769-C-A

Position:

• chr19-10987769-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_003072.5(SMARCA4):​c.963C>A​(p.Ala321Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SMARCA4 NM_003072.5 synonymous
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: -4.33

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.963C>A	p.Ala321Ala	synonymous_variant	6/36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.963C>A	p.Ala321Ala	synonymous_variant	6/35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.963C>A	p.Ala321Ala	synonymous_variant	6/36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.963C>A	p.Ala321Ala	synonymous_variant	6/35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.963C>A	p.Ala321Ala	synonymous_variant	6/35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.963C>A	p.Ala321Ala	synonymous_variant	7/35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.963C>A	p.Ala321Ala	synonymous_variant	6/34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.963C>A	p.Ala321Ala	synonymous_variant	6/34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.963C>A	p.Ala321Ala	synonymous_variant	7/35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.375C>A	p.Ala125Ala	synonymous_variant	3/32			ENSP00000496004.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1446202 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 718108

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:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 14, 2022	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 sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. ClinVar contains an entry for this variant (Variation ID: 1379667). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects codon 321 of the SMARCA4 mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the SMARCA4 protein. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	May 19, 2023	- -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 11, 2020

The c.963C>A (p.A321A) alteration is located in exon 6 (coding exon 5) of the SMARCA4 gene. This alteration consists of a C to A substitution at nucleotide position 963. This nucleotide substitution does not change the amino acid at codon 321. However, this change occurs in the last nucleotide of Exon 6 (c.860_1118) which makes it likely to have some effect on normal mRNA splicing. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.78
CADD	Benign	2.4
DANN	Benign	0.53
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.32		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.32		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-11098445;