rs1555753296

Positions:

• chr19-10986362-C-G
• chr19-10986362-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001387283.1(SMARCA4):​c.529C>G​(p.Leu177Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. L177L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA4 NM_001387283.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.75

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 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMARCA4
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.874

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1	c.529C>G	p.Leu177Val	missense_variant	4/36	ENST00000646693.2
SMARCA4	NM_003072.5	c.529C>G	p.Leu177Val	missense_variant	4/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2	c.529C>G	p.Leu177Val	missense_variant	4/36		NM_001387283.1
SMARCA4	ENST00000344626.10	c.529C>G	p.Leu177Val	missense_variant	4/35	1	NM_003072.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Intellectual disability, autosomal dominant 16 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genome-Nilou Lab

Jul 15, 2021

- -

Rhabdoid tumor predisposition syndrome 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 27, 2022

This variant is not present in population databases (gnomAD no frequency). 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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 858706). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. This sequence change replaces leucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 177 of the SMARCA4 protein (p.Leu177Val). -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Dec 24, 2020

Not observed in large population cohorts (Lek et al., 2016); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.71
BayesDel_addAF	Uncertain	0.094	D
BayesDel_noAF	Benign	-0.10
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.42	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.46
FATHMM_MKL	Uncertain	0.92	D
M_CAP	Pathogenic	0.74	D
MetaRNN	Pathogenic	0.87	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.65	D
MutationAssessor	Uncertain	2.1	M;.;.;.;M;M;.;M;M;M;M;M;M;M;M;M;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.79	T
PROVEAN	Benign	-1.7	N;.;.;.;.;.;.;.;.;.;N;.;N;.;N;.;N;N
REVEL	Uncertain	0.62
Sift	Benign	0.034	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D
Sift4G	Benign	0.17	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T
Polyphen		0.98	D;.;D;.;.;.;.;.;.;.;D;.;.;.;.;.;.;D
Vest4		0.77
MutPred		0.76		Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);Gain of MoRF binding (P = 0.0836);
MVP		0.62
MPC		0.90
ClinPred		0.89	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.26
gMVP		0.63

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1555753296; hg19: chr19-11097038;