19-10984154-G-A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_001387283.1(SMARCA4):c.3G>A(p.Met1?) variant causes a start lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,442 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: SMARCA4 NM_001387283.1 start_lost
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.99

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 Pathogenic. Variant got 10 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1	c.3G>A	p.Met1?	start_lost	2/36	ENST00000646693.2
SMARCA4	NM_003072.5	c.3G>A	p.Met1?	start_lost	2/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2	c.3G>A	p.Met1?	start_lost	2/36		NM_001387283.1
SMARCA4	ENST00000344626.10	c.3G>A	p.Met1?	start_lost	2/35	1	NM_003072.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461442 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 2 AN XY: 727030

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 14, 2021

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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals with SMARCA4-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change affects the initiator methionine of the SMARCA4 mRNA. The next in-frame methionine is located at codon 27. -

Neurodevelopmental disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory of Molecular Genetics (Pr. Bezieau's lab), CHU de Nantes

Jul 02, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.43
Cadd	Uncertain	25
Dann	Uncertain	1.0
DEOGEN2	Uncertain	0.54	D;.;T;.;.;.;.;.;.;.;D;.;.;.;.;.;.;T;T
Eigen	Uncertain	0.47
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Pathogenic	0.89	D
MetaRNN	Pathogenic	0.86	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.45	D
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PROVEAN	Benign	-1.6	N;.;.;.;.;.;.;.;.;.;N;.;.;N;.;N;.;N;N
REVEL	Pathogenic	0.78
Sift	Pathogenic	0.0	D;.;.;.;.;.;.;.;.;.;D;.;.;D;.;D;.;D;D
Sift4G	Pathogenic	0.0	D;.;.;.;.;.;.;.;.;.;D;.;.;D;D;D;D;D;D
Polyphen		0.53	P;.;P;.;.;.;.;.;.;.;P;.;.;.;.;.;.;.;P
Vest4		0.90
MutPred		0.99		Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);Gain of catalytic residue at M1 (P = 0.102);
MVP		0.98
ClinPred		0.99	D
GERP RS		5.0
RBP_binding_hub_radar		0.92
RBP_regulation_power_radar		2.7
Varity_R		0.82
gMVP		0.52

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: chr19-11094830;