rs1555795394

chr19-11058845-C-Achr19-11058845-C-Gchr19-11058845-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP2

The NM_001387283.1(SMARCA4):c.4687C>A(p.Leu1563Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L1563H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA4 NM_001387283.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.347

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant where missense usually causes diseases, SMARCA4

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1	c.4687C>A	p.Leu1563Ile	missense_variant	33/36	ENST00000646693.2
SMARCA4	NM_003072.5	c.4591C>A	p.Leu1531Ile	missense_variant	32/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2	c.4687C>A	p.Leu1563Ile	missense_variant	33/36		NM_001387283.1
SMARCA4	ENST00000344626.10	c.4591C>A	p.Leu1531Ile	missense_variant	32/35	1	NM_003072.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 08, 2017

In summary, this variant has uncertain impact on SMARCA4 function. The available evidence is currently insufficient to determine its role in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with a SMARCA4-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with isoleucine at codon 1563 of the SMARCA4 protein (p.Leu1563Ile). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and isoleucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.56
BayesDel_addAF	Benign	-0.049	T
BayesDel_noAF	Benign	-0.31
Cadd	Benign	21
Dann	Uncertain	1.0
DEOGEN2	Benign	0.39	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T;.;.;.;.;.
Eigen	Uncertain	0.35
Eigen_PC	Benign	0.18
FATHMM_MKL	Benign	0.43	N
M_CAP	Benign	0.078	D
MetaRNN	Uncertain	0.73	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.71	T
MutationAssessor	Pathogenic	3.2	M;.;.;.;.;.;.;.;.;.;M;.;.;.;.;.;.;.;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-1.4	N;.;.;.;.;.;.;.;.;.;N;.;.;.;N;.;.;.;.;.;.;.;.
REVEL	Uncertain	0.32
Sift	Uncertain	0.0090	D;.;.;.;.;.;.;.;.;.;D;.;.;.;D;.;.;.;.;.;.;.;.
Sift4G	Uncertain	0.055	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;D;D;.;.;.;.;.
Polyphen		0.99	D;.;P;.;.;.;.;.;.;.;D;.;.;.;.;.;.;P;.;.;.;.;.
Vest4		0.66
MutPred		0.80		.;.;Loss of ubiquitination at K1559 (P = 0.1473);.;.;.;.;.;.;.;.;.;.;.;.;.;.;Loss of ubiquitination at K1559 (P = 0.1473);.;.;.;.;.;
MVP		0.45
MPC		2.2
ClinPred		0.97	D
GERP RS		-1.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.50
gMVP		0.93

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: rs1555795394; hg19: chr19-11169521;