19-10986588-C-T

Position:

• chr19-10986588-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2 PP2 BP4

The NM_003072.5(SMARCA4):​c.755C>T​(p.Pro252Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000723 in 1,383,930 control chromosomes in the GnomAD database, with no homozygous occurrence. 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)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: SMARCA4 NM_003072.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.28

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]

SMARCA4 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), SMARCA4. . Gene score misZ 6.8459 (greater than the threshold 3.09). Trascript score misZ 8.7957 (greater than threshold 3.09). GenCC has associacion of gene with uterine corpus sarcoma, Coffin-Siris syndrome 1, intellectual disability, autosomal dominant 16, rhabdoid tumor predisposition syndrome 2, familial rhabdoid tumor, hereditary nonpolyposis colon cancer, Coffin-Siris syndrome.
• BP4: Computational evidence support a benign effect (MetaRNN=0.3197757).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.755C>T	p.Pro252Leu	missense_variant	4/36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.755C>T	p.Pro252Leu	missense_variant	4/35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.755C>T	p.Pro252Leu	missense_variant	4/36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.755C>T	p.Pro252Leu	missense_variant	4/35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.755C>T	p.Pro252Leu	missense_variant	4/35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.755C>T	p.Pro252Leu	missense_variant	5/35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.755C>T	p.Pro252Leu	missense_variant	4/34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.755C>T	p.Pro252Leu	missense_variant	4/34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.755C>T	p.Pro252Leu	missense_variant	5/35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.167C>T	p.Pro56Leu	missense_variant	1/32			ENSP00000496004.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000764 AC: 1 AN: 130940 Hom.: 0 AF XY: 0.0000139 AC XY: 1 AN XY: 71692

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000203

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 7.23e-7 AC: 1 AN: 1383930 Hom.: 0 Cov.: 34 AF XY: 0.00000146 AC XY: 1 AN XY: 682940

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: 9.27e-7

Gnomad4 OTH exome AF: 0.00

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

Labcorp Genetics (formerly Invitae), Labcorp

Jul 24, 2020

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 missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C35"). This variant has not been reported in the literature in individuals with SMARCA4-related disease. While this variant is not present in population databases, the frequency information is unreliable, as metrics indicate poor data quality at this position in the ExAC database. This sequence change replaces proline with leucine at codon 252 of the SMARCA4 protein (p.Pro252Leu). The proline residue is highly conserved and there is a moderate physicochemical difference between proline and leucine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.18
BayesDel_addAF	Uncertain	0.035	T
BayesDel_noAF	Benign	-0.16
CADD	Uncertain	26
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.64	D;.;T;.;.;.;.;.;.;.;D;.;.;.;.;.;T;T
Eigen	Benign	0.042
Eigen_PC	Benign	0.18
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Pathogenic	0.98	.;D;.;.;.;.;D;.;.;.;D;.;D;D;D;D;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.32	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Uncertain	0.091	D
MutationAssessor	Benign	1.7	L;.;.;.;L;L;.;L;L;L;L;L;L;L;L;L;.;.
PrimateAI	Pathogenic	0.80	T
PROVEAN	Uncertain	-2.5	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D
REVEL	Uncertain	0.36
Sift	Uncertain	0.0030	D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D
Sift4G	Uncertain	0.053	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T
Polyphen		0.099	B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;B
Vest4		0.57
MutPred		0.32		Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);Loss of loop (P = 0.1242);
MVP		0.61
MPC		0.27
ClinPred		0.80	D
GERP RS		5.0
Varity_R		0.16
gMVP		0.20

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: rs1316419985; hg19: chr19-11097264;