chr19-10987778-C-A

Variant names:

• chr19-10987778-C-A
• rs369239429
• NM_001387283.1:c.972C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_001387283.1(SMARCA4):​c.972C>A​(p.Pro324Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000691 in 1,447,420 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P324P) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SMARCA4 NM_001387283.1 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -3.91
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• Coffin-Siris syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet, Illumina
• intellectual disability, autosomal dominant 16

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics
• rhabdoid tumor predisposition syndrome 2

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, ClinGen, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), G2P
• uterine corpus sarcoma

  Inheritance: AR Classification: MODERATE Submitted by: Genomics England PanelApp
• familial rhabdoid tumor

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• hereditary nonpolyposis colon cancer

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.73).
• BP7: Synonymous conserved (PhyloP=-3.91 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 35	ENST00000344626.10	NP_003063.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMARCA4	ENST00000646693.2	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 36		NM_001387283.1	ENSP00000495368.1
SMARCA4	ENST00000344626.10	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 35	1	NM_003072.5	ENSP00000343896.4
SMARCA4	ENST00000643549.1	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 35			ENSP00000493975.1
SMARCA4	ENST00000541122.6	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 7 of 35	5		ENSP00000445036.2
SMARCA4	ENST00000643296.1	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 34			ENSP00000496635.1
SMARCA4	ENST00000644737.1	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 6 of 34			ENSP00000495548.1
SMARCA4	ENST00000589677.5	c.972C>A	p.Pro324Pro	synonymous_variant	Exon 7 of 35	5		ENSP00000464778.1
SMARCA4	ENST00000643995.1	c.384C>A	p.Pro128Pro	synonymous_variant	Exon 3 of 32			ENSP00000496004.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.91e-7 AC: 1 AN: 1447420 Hom.: 0 Cov.: 34 AF XY: 0.00000139 AC XY: 1 AN XY: 718906

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33134

American (AMR) AF: 0.00 AC: 0 AN: 43130

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25724

East Asian (EAS) AF: 0.0000257 AC: 1 AN: 38912

South Asian (SAS) AF: 0.00 AC: 0 AN: 84838

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50474

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5658

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1105872

Other (OTH) AF: 0.00 AC: 0 AN: 59678

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.73
CADD	Benign	0.027
DANN	Benign	0.68
PhyloP100		-3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=98/2	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.11		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs369239429; hg19: chr19-11098454;