chr19-10987812-C-A

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 1P and 0B. PP3

The NM_001387283.1(SMARCA4):c.1006C>A(p.Pro336Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000218 in 1,604,326 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 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. P336L) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000021 ( 0 hom. )

Consequence

SMARCA4
NM_001387283.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 7.76

Publications

2 publications found

Variant links:

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

SMARCA4 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.748

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 35	ENST00000344626.10	NP_003063.2	P51532-1A7E2E1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SMARCA4	ENST00000646693.2 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 36		NM_001387283.1	ENSP00000495368.1	Q9HBD4
SMARCA4	ENST00000344626.10 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 35	1	NM_003072.5	ENSP00000343896.4	P51532-1
SMARCA4	ENST00000643549.1 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 35			ENSP00000493975.1	A0A2R8Y4P4
SMARCA4	ENST00000541122.6 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 7 of 35	5		ENSP00000445036.2	P51532-4
SMARCA4	ENST00000643296.1 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 34			ENSP00000496635.1	P51532-4
SMARCA4	ENST00000644737.1 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 6 of 34			ENSP00000495548.1	P51532-4
SMARCA4	ENST00000589677.5 link	c.1006C>A	p.Pro336Thr	missense_variant	Exon 7 of 35	5		ENSP00000464778.1	P51532-3
SMARCA4	ENST00000643995.1 link	c.418C>A	p.Pro140Thr	missense_variant	Exon 3 of 32			ENSP00000496004.1	A0A2R8YGG3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152158

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000588

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000137

AC:

AN:

219610

AF XY:

0.0000165

show subpopulations

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000317

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000213

AC:

AN:

1452168

Hom.:

Cov.:

AF XY:

0.0000194

AC XY:

AN XY:

721756

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33270

American (AMR)

AF:

0.00

AC:

AN:

43680

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25876

East Asian (EAS)

AF:

0.00

AC:

AN:

39306

South Asian (SAS)

AF:

0.00

AC:

AN:

85132

European-Finnish (FIN)

AF:

0.00

AC:

AN:

51128

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5574

European-Non Finnish (NFE)

AF:

0.0000244

AC:

AN:

1108274

Other (OTH)

AF:

0.0000667

AC:

AN:

59928

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.509

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152158

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74330

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41430

American (AMR)

AF:

0.00

AC:

AN:

15276

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5186

South Asian (SAS)

AF:

0.00

AC:

AN:

4832

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10628

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.513

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000283

Hom.:

Bravo

AF:

0.0000151

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000120

AC:

ExAC

AF:

0.00000836

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2

Uncertain:2

Mar 18, 2024

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Dec 26, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 336 of the SMARCA4 protein (p.Pro336Thr). This variant is present in population databases (rs111491424, gnomAD 0.004%). This missense change has been observed in individual(s) with an unspecified cancer type (PMID: 28873162). ClinVar contains an entry for this variant (Variation ID: 220684). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt SMARCA4 protein function with a negative predictive value of 80%. 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. -

Hereditary cancer-predisposing syndrome

Uncertain:2

Nov 15, 2021

Sema4, Sema4

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:curation

- -

Aug 06, 2024

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.P336T variant (also known as c.1006C>A), located in coding exon 5 of the SMARCA4 gene, results from a C to A substitution at nucleotide position 1006. The proline at codon 336 is replaced by threonine, an amino acid with highly similar properties. This variant has been detected in multiple individuals with no reported features of Coffin-Siris syndrome (Ambry internal data). In one study, of 1040 patients with advanced cancer who had germline analysis of 76 cancer predisposition genes, this alteration was reported as a variant of uncertain significance (Mandelker D et al. JAMA. 2017 09;318:825-835). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the supporting evidence, the association of this alteration with rhabdoid tumor predisposition syndrome is unknown; however, the association of this alteration with Coffin-Siris syndrome is unlikely. -

Intellectual disability, autosomal dominant 16

Uncertain:1

Jul 15, 2021

Genome-Nilou Lab

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

May 07, 2023

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.074

BayesDel_addAF

Uncertain

0.096

BayesDel_noAF

Uncertain

0.020

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.71

D;.;T;.;.;.;.;.;.;.;D;.;.;.;.;.;T;T

Eigen

Uncertain

0.45

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.88

.;D;.;.;.;.;D;.;.;.;D;.;D;D;D;D;D;D

M_CAP

Pathogenic

0.37

MetaRNN

Pathogenic

0.75

D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.36

MutationAssessor

Uncertain

2.1

M;.;.;.;M;M;.;M;M;M;M;M;M;M;M;M;.;.

PhyloP100

7.8

PrimateAI

Uncertain

0.77

PROVEAN

Uncertain

-2.9

D;.;.;.;.;.;.;.;.;.;D;.;D;.;D;.;D;D

REVEL

Uncertain

0.55

Sift

Benign

0.040

D;.;.;.;.;.;.;.;.;.;D;.;T;.;T;.;T;T

Sift4G

Benign

0.14

T;.;.;.;.;.;.;.;.;.;T;.;T;T;T;T;T;T

Polyphen

0.90

P;.;P;.;.;.;.;.;.;.;P;.;.;.;.;.;.;P

Vest4

0.76

MVP

0.67

MPC

0.74

ClinPred

0.83

GERP RS

4.4

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.33

gMVP

0.44

Mutation Taster

=66/34

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over