19-10987785-C-T

Variant names:

• chr19-10987785-C-T
• rs770946823
• NM_001387283.1:c.979C>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_001387283.1(SMARCA4):​c.979C>T​(p.Pro327Ser) variant causes a missense change. The variant allele was found at a frequency of 0.000000691 in 1,448,010 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P327T) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SMARCA4 NM_001387283.1 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.79
• Publications: 1 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: Uncertain_significance. The variant received 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001387283.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCA4	NM_001387283.1	MANE Plus Clinical	c.979C>T	p.Pro327Ser	missense	Exon 6 of 36	NP_001374212.1
	SMARCA4	NM_003072.5	MANE Select	c.979C>T	p.Pro327Ser	missense	Exon 6 of 35	NP_003063.2
	SMARCA4	NM_001128849.3		c.979C>T	p.Pro327Ser	missense	Exon 6 of 36	NP_001122321.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMARCA4	ENST00000646693.2	MANE Plus Clinical	c.979C>T	p.Pro327Ser	missense	Exon 6 of 36	ENSP00000495368.1
	SMARCA4	ENST00000344626.10	TSL:1 MANE Select	c.979C>T	p.Pro327Ser	missense	Exon 6 of 35	ENSP00000343896.4
	SMARCA4	ENST00000643549.1		c.979C>T	p.Pro327Ser	missense	Exon 6 of 35	ENSP00000493975.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.91e-7 AC: 1 AN: 1448010 Hom.: 0 Cov.: 34 AF XY: 0.00 AC XY: 0 AN XY: 719334

⚠️ 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: 33154

American (AMR) AF: 0.00 AC: 0 AN: 43222

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25766

East Asian (EAS) AF: 0.00 AC: 0 AN: 39004

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

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50472

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5638

European-Non Finnish (NFE) AF: 9.04e-7 AC: 1 AN: 1106202

Other (OTH) AF: 0.00 AC: 0 AN: 59714

⚠️ 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

ClinVar submissions as Germline

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	1	-	Hereditary cancer-predisposing syndrome (1)
-	1	-	Rhabdoid tumor predisposition syndrome 2 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Uncertain	0.078	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.49	T
Eigen	Benign	0.13
Eigen_PC	Benign	0.16
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.94	D
M_CAP	Pathogenic	0.36	D
MetaRNN	Uncertain	0.47	T
MetaSVM	Uncertain	0.48	D
MutationAssessor	Benign	1.7	L
PhyloP100		4.8
PrimateAI	Uncertain	0.75	T
PROVEAN	Benign	-2.2	N
REVEL	Uncertain	0.47
Sift	Benign	0.11	T
Sift4G	Benign	0.25	T
Polyphen		0.63	P
Vest4		0.39
MutPred		0.28		Loss of catalytic residue at P327 (P = 0.0231)
MVP		0.63
MPC		0.27
ClinPred		0.79	D
GERP RS		4.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.11
gMVP		0.29
Mutation Taster		=55/45	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.12		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: rs770946823; hg19: chr19-11098461;