19-11039543-G-C

Position:

• chr19-11039543-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000344626.10(SMARCA4):​c.4171-1764G>C variant causes a intron 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)
• Consequence: SMARCA4 ENST00000344626.10 intron
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.730

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 Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17351305).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.4256G>C	p.Arg1419Pro	missense_variant	30/36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.4171-1764G>C		intron_variant		ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.4256G>C	p.Arg1419Pro	missense_variant	30/36		NM_001387283.1	ENSP00000495368
SMARCA4	ENST00000344626.10	c.4171-1764G>C		intron_variant		1	NM_003072.5	ENSP00000343896	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

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

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 26, 2021

The p.R1419P variant (also known as c.4256G>C), located in coding exon 29 of the SMARCA4 gene, results from a G to C substitution at nucleotide position 4256. The arginine at codon 1419 is replaced by proline, an amino acid with dissimilar properties. Missense and in-frame variants in SMARCA4 are known to cause neurodevelopmental disorders; however, such associations with rhabdoid tumor predisposition syndrome including small cell carcinoma of the ovary-hypercalcemic type (SCCOHT) 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). This amino acid position is conserved on limited sequence alignment. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the supporting evidence, the association of this alteration with Coffin-Siris syndrome is unknown; however, the association of this alteration with rhabdoid tumor predisposition syndrome is unlikely. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	15
DANN	Uncertain	0.99
DEOGEN2	Benign	0.0095	.;T;.;.;T
Eigen	Benign	-0.70
Eigen_PC	Benign	-0.85
FATHMM_MKL	Benign	0.0088	N
LIST_S2	Benign	0.66	T;.;.;T;T
M_CAP	Pathogenic	0.30	D
MetaRNN	Benign	0.17	T;T;T;T;T
MetaSVM	Benign	-0.62	T
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N;N
PrimateAI	Uncertain	0.50	T
Sift4G	Uncertain	0.018	.;.;.;.;D
Polyphen		0.84	.;P;.;.;P
Vest4		0.33
MutPred		0.50		.;Loss of solvent accessibility (P = 3e-04);.;.;Loss of solvent accessibility (P = 3e-04);
MVP		0.12
ClinPred		0.22	T
GERP RS		-0.52

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		Details are displayed if max score is > 0.2

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: chr19-11150219;