19-11041565-G-C

Variant names:

• chr19-11041565-G-C
• rs756617788
• NM_001387283.1:c.4520+5G>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001387283.1(SMARCA4):​c.4520+5G>C variant causes a splice region, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA4 NM_001387283.1 splice_region, intron
• Scores: Splicing: ADA: 0.6040
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.40
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Coffin-Siris syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet, Illumina
• intellectual disability, autosomal dominant 16

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• rhabdoid tumor predisposition syndrome 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• uterine corpus sarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• familial rhabdoid tumor

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary nonpolyposis colon cancer

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.72).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.4520+5G>C		splice_region_variant, intron_variant	Intron 31 of 35	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.4424+5G>C		splice_region_variant, intron_variant	Intron 30 of 34	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.4520+5G>C		splice_region_variant, intron_variant	Intron 31 of 35		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.4424+5G>C		splice_region_variant, intron_variant	Intron 30 of 34	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.4430+5G>C		splice_region_variant, intron_variant	Intron 30 of 34			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.4334+5G>C		splice_region_variant, intron_variant	Intron 30 of 34	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.4334+5G>C		splice_region_variant, intron_variant	Intron 29 of 33			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.4334+5G>C		splice_region_variant, intron_variant	Intron 29 of 33			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.4334+5G>C		splice_region_variant, intron_variant	Intron 30 of 34	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.3845+5G>C		splice_region_variant, intron_variant	Intron 27 of 31			ENSP00000496004.1
SMARCA4	ENST00000644963.1	c.3077+5G>C		splice_region_variant, intron_variant	Intron 23 of 27			ENSP00000495599.1
SMARCA4	ENST00000644065.1	c.3059+5G>C		splice_region_variant, intron_variant	Intron 22 of 26			ENSP00000493615.1
SMARCA4	ENST00000642350.1	c.2918+5G>C		splice_region_variant, intron_variant	Intron 22 of 26			ENSP00000495355.1
SMARCA4	ENST00000643857.1	c.2786+5G>C		splice_region_variant, intron_variant	Intron 21 of 24			ENSP00000494159.1
SMARCA4	ENST00000538456.4	c.590+5G>C		splice_region_variant, intron_variant	Intron 4 of 7	3		ENSP00000495197.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Dec 12, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.4520+5G>C intronic variant results from a G to C substitution 5 nucleotides after coding exon 30 in the SMARCA4 gene. This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will not have any significant effect on splicing. 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
BayesDel_noAF	Benign	-0.72
CADD	Benign	20
DANN	Benign	0.59
PhyloP100		6.4
Mutation Taster		=83/17	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.60
dbscSNV1_RF	Benign	0.46
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

Other links and lift over

dbSNP: rs756617788; hg19: chr19-11152241;