rs797045982

Variant names:

• chr19-11030821-T-TG
• rs797045982
• NM_001387283.1:c.3480dupG

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_003072.5(SMARCA4):​c.3480dupG​(p.Leu1161AlafsTer15) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMARCA4 NM_003072.5 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 9.69

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 Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-11030821-T-TG is Pathogenic according to our data. Variant chr19-11030821-T-TG is described in ClinVar as [Pathogenic]. Clinvar id is 212249.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 26 of 35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 25 of 34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.3480dupG	p.Leu1161AlafsTer15	frameshift_variant	Exon 26 of 35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.2892dupG	p.Leu965fs	frameshift_variant	Exon 22 of 32			ENSP00000496004.1
SMARCA4	ENST00000644963.1	c.2124dupG	p.Leu709fs	frameshift_variant	Exon 18 of 28			ENSP00000495599.1
SMARCA4	ENST00000644065.1	c.2205dupG	p.Leu736fs	frameshift_variant	Exon 18 of 27			ENSP00000493615.1
SMARCA4	ENST00000642350.1	c.1965dupG	p.Leu656AlafsTer15	frameshift_variant	Exon 17 of 27			ENSP00000495355.1
SMARCA4	ENST00000643857.1	c.1833dupG	p.Leu612fs	frameshift_variant	Exon 16 of 25			ENSP00000494159.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Pathogenic:2

Feb 16, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 26, 2014

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary cancer-predisposing syndrome Pathogenic:1

Aug 24, 2023

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.3480dupG pathogenic mutation, located in coding exon 24 of the SMARCA4 gene, results from a duplication of G at nucleotide position 3480, causing a translational frameshift with a predicted alternate stop codon (p.L1161Afs*15). In a cohort of patients with small cell carcinoma of the ovary-hypercalcemic type (SCCOHT), this variant was identified in one case with reportedly non-familial SCCOHT (Witkowski L et al. Nat Genet, 2014 May;46:438-43). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). Loss-of-function variants in SMARCA4 are known to cause rhabdoid tumor predisposition syndrome including SCCOHT; however, such associations with neurodevelopmental disorders are exceedingly rare (Kosho T et al. Am J Med Genet C Semin Med Genet. 2014 Sep;166C(3):262-75; Jelinic P et al. Nat Genet. 2014 May;46(5):424-6). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. Based on the supporting evidence, this alteration is pathogenic for rhabdoid tumor predisposition syndrome; however, the association of this alteration with Coffin-Siris syndrome is unlikely. -

Computational scores

Source: dbNSFP v4.3

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: rs797045982; hg19: chr19-11141497;