19-10986557-C-A

Position:

• chr19-10986557-C-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_001387283.1(SMARCA4):​c.724C>A​(p.Pro242Thr) 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 benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar 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: 1.42

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 1 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=0.19769412).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.724C>A	p.Pro242Thr	missense_variant	4/36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.724C>A	p.Pro242Thr	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.724C>A	p.Pro242Thr	missense_variant	4/36		NM_001387283.1	ENSP00000495368
SMARCA4	ENST00000344626.10	c.724C>A	p.Pro242Thr	missense_variant	4/35	1	NM_003072.5	ENSP00000343896	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

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

May 11, 2017

The p.P242T variant (also known as c.724C>A), located in coding exon 3 of the SMARCA4 gene, results from a C to A substitution at nucleotide position 724. The proline at codon 242 is replaced by threonine, an amino acid with highly similar properties. This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.075
BayesDel_addAF	Uncertain	0.024	T
BayesDel_noAF	Benign	-0.20
CADD	Benign	18
DANN	Benign	0.96
DEOGEN2	Benign	0.27	T;.;T;.;.;.;.;.;.;.;T;.;.;.;.;.;T;T
Eigen	Benign	-0.39
Eigen_PC	Benign	-0.33
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.95	.;D;.;.;.;.;D;.;.;.;D;.;D;D;D;D;D;D
M_CAP	Uncertain	0.12	D
MetaRNN	Benign	0.20	T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.32	T
MutationAssessor	Benign	0.69	N;.;.;.;N;N;.;N;N;N;N;N;N;N;N;N;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D;D
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-0.17	N;.;.;.;.;.;.;.;.;.;N;.;N;.;N;.;N;N
REVEL	Benign	0.28
Sift	Benign	0.098	T;.;.;.;.;.;.;.;.;.;T;.;T;.;T;.;T;T
Sift4G	Benign	0.41	T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T
Polyphen		0.14	B;.;P;.;.;.;.;.;.;.;B;.;.;.;.;.;.;P
Vest4		0.51
MutPred		0.25		Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);Gain of phosphorylation at P242 (P = 0.0033);
MVP		0.56
MPC		0.29
ClinPred		0.20	T
GERP RS		4.5
Varity_R		0.040
gMVP		0.12

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

LitVar

Other links and lift over

dbSNP: rs1555753773; hg19: chr19-11097233;