19-10984152-A-T

Position:

• chr19-10984152-A-T

Variant summary

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

The NM_003072.5(SMARCA4):​c.1A>T​(p.Met1?) variant causes a initiator codon 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. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SMARCA4 NM_003072.5 initiator_codon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.57

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	Protein	UniProt
SMARCA4	NM_001387283.1	c.1A>T	p.Met1?	initiator_codon_variant	2/36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.1A>T	p.Met1?	initiator_codon_variant	2/35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.1A>T	p.Met1?	initiator_codon_variant	2/36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.1A>T	p.Met1?	initiator_codon_variant	2/35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.1A>T	p.Met1?	initiator_codon_variant	2/35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.1A>T	p.Met1?	initiator_codon_variant	3/35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.1A>T	p.Met1?	initiator_codon_variant	2/34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.1A>T	p.Met1?	initiator_codon_variant	2/34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.1A>T	p.Met1?	initiator_codon_variant	3/35	5		ENSP00000464778.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

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

Aug 08, 2024

The p.M1? variant (also known as c.1A>T) is located in coding exon 1 of the SMARCA4 gene and results from a A to T substitution at nucleotide position 1. This alters the methionine residue at the initiation codon (ATG). Variations that modify the initiation codon (ATG) are expected to result in either loss of translation initiation, N-terminal truncation, or cause a shift in the mRNA reading frame; however, there is an in-frame methionine 26 amino acids from the initiation site, which may result in N-terminal truncation of unknown functional significance. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.45	D
BayesDel_noAF	Pathogenic	0.40
CADD	Uncertain	24
DANN	Benign	0.95
DEOGEN2	Uncertain	0.51	D;.;T;.;.;.;.;.;.;.;D;.;.;.;.;.;.;T;T
Eigen	Uncertain	0.25
Eigen_PC	Uncertain	0.37
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.90	.;D;.;.;.;.;D;.;.;.;D;D;.;D;D;D;D;D;D
M_CAP	Pathogenic	0.83	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D
MetaSVM	Uncertain	0.20	D
PROVEAN	Benign	-1.2	N;.;.;.;.;.;.;.;.;.;N;.;.;N;.;N;.;N;N
REVEL	Pathogenic	0.77
Sift	Pathogenic	0.0	D;.;.;.;.;.;.;.;.;.;D;.;.;D;.;D;.;D;D
Sift4G	Pathogenic	0.0	D;.;.;.;.;.;.;.;.;.;D;.;.;D;D;D;D;D;D
Polyphen		0.17	B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;.;B
Vest4		0.93
MutPred		0.99		Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);Gain of catalytic residue at M1 (P = 0.1359);
MVP		0.98
ClinPred		0.99	D
GERP RS		5.0
Varity_R		0.82
gMVP		0.36

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr19-11094828;