chr19-11013113-G-C

Position:

• chr19-11013113-G-C

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_003072.5(SMARCA4):​c.2438+1G>C variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA4 NM_003072.5 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 10.0

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 Pathogenic. Variant got 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 19-11013113-G-C is Pathogenic according to our data. Variant chr19-11013113-G-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2452865.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.2438+1G>C		splice_donor_variant, intron_variant		ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.2438+1G>C		splice_donor_variant, intron_variant		ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.2438+1G>C		splice_donor_variant, intron_variant			NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.2438+1G>C		splice_donor_variant, intron_variant		1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.2438+1G>C		splice_donor_variant, intron_variant				ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.2438+1G>C		splice_donor_variant, intron_variant		5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.2438+1G>C		splice_donor_variant, intron_variant				ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.2438+1G>C		splice_donor_variant, intron_variant				ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.2438+1G>C		splice_donor_variant, intron_variant		5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.1850+1G>C		splice_donor_variant, intron_variant				ENSP00000496004.1
SMARCA4	ENST00000644963.1	c.1082+1G>C		splice_donor_variant, intron_variant				ENSP00000495599.1
SMARCA4	ENST00000644065.1	c.1163+1G>C		splice_donor_variant, intron_variant				ENSP00000493615.1
SMARCA4	ENST00000642350.1	c.923+1G>C		splice_donor_variant, intron_variant				ENSP00000495355.1
SMARCA4	ENST00000643857.1	c.791+1G>C		splice_donor_variant, intron_variant				ENSP00000494159.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 13, 2024

The c.2438+1G>C intronic variant results from a G to C substitution one nucleotide after coding exon 15 of the SMARCA4 gene. Alterations that disrupt the canonical splice site are expected to cause aberrant splicing, resulting in an abnormal protein or a transcript that is subject to nonsense-mediated mRNA decay. This nucleotide position is highly conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice donor site; however, direct evidence is insufficient at this time (Ambry internal data). Loss-of-function variants in SMARCA4 are known to cause rhabdoid tumor predisposition syndrome including small cell carcinoma of the ovary-hypercalcemic type (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). Based on the supporting evidence, this alteration is likely pathogenic for rhabdoid tumor predisposition syndrome; however, the association of this alteration with Coffin-Siris syndrome is unknown. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.40
CADD	Pathogenic	34
DANN	Uncertain	0.99
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	1.0	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.94
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DL_spliceai		1.0		Position offset: -1

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

Publications

LitVar

Other links and lift over

dbSNP: rs1555774786; hg19: chr19-11123789;