NM_001387283.1:c.206T>C

Variant names:

Variant summary

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

The NM_001387283.1(SMARCA4):c.206T>C(p.Met69Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000252 in 1,589,378 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. M69I) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

SMARCA4
NM_001387283.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 8.02

Publications

1 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 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1 link	c.206T>C	p.Met69Thr	missense_variant	Exon 2 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5 link	c.206T>C	p.Met69Thr	missense_variant	Exon 2 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.206T>C	p.Met69Thr	missense_variant	Exon 2 of 36		NM_001387283.1	ENSP00000495368.1	Q9HBD4
SMARCA4	ENST00000344626.10 link	c.206T>C	p.Met69Thr	missense_variant	Exon 2 of 35	1	NM_003072.5	ENSP00000343896.4	P51532-1
SMARCA4	ENST00000643549.1 link	c.206T>C	p.Met69Thr	missense_variant	Exon 2 of 35			ENSP00000493975.1	A0A2R8Y4P4
SMARCA4	ENST00000541122.6 link	c.206T>C	p.Met69Thr	missense_variant	Exon 3 of 35	5		ENSP00000445036.2	P51532-4
SMARCA4	ENST00000643296.1 link	c.206T>C	p.Met69Thr	missense_variant	Exon 2 of 34			ENSP00000496635.1	P51532-4
SMARCA4	ENST00000644737.1 link	c.206T>C	p.Met69Thr	missense_variant	Exon 2 of 34			ENSP00000495548.1	P51532-4
SMARCA4	ENST00000589677.5 link	c.206T>C	p.Met69Thr	missense_variant	Exon 3 of 35	5		ENSP00000464778.1	P51532-3

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152186

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000209

AC:

AN:

1437192

Hom.:

Cov.:

AF XY:

0.00000281

AC XY:

AN XY:

712762

show subpopulations

African (AFR)

AF:

0.0000305

AC:

AN:

32782

American (AMR)

AF:

0.00

AC:

AN:

41792

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25604

East Asian (EAS)

AF:

0.00

AC:

AN:

38158

South Asian (SAS)

AF:

0.00

AC:

AN:

83016

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50998

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5648

European-Non Finnish (NFE)

AF:

0.00000182

AC:

AN:

1099840

Other (OTH)

AF:

0.00

AC:

AN:

59354

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.492

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:

0.00000657

AC:

AN:

152186

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74352

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41452

American (AMR)

AF:

0.00

AC:

AN:

15292

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10618

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2092

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

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

- -

Rhabdoid tumor predisposition syndrome 2

Uncertain:1

Apr 29, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces methionine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 69 of the SMARCA4 protein (p.Met69Thr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. ClinVar contains an entry for this variant (Variation ID: 470281). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SMARCA4 protein function. 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:1

Jun 13, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The p.M69T variant (also known as c.206T>C), located in coding exon 1 of the SMARCA4 gene, results from a T to C substitution at nucleotide position 206. The methionine at codon 69 is replaced by threonine, an amino acid with similar properties. This variant has been detected in multiple individuals with no reported features of SMARCA4-associated Coffin-Siris syndrome (Ambry internal data). This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Missense and in-frame variants in SMARCA4 are known to cause neurodevelopmental disorders; however, such associations with rhabdoid tumor predisposition syndrome including small cell carcinoma of the ovary-hypercalcemic type (SCCOHT) are exceedingly rare (Kosho T et al. Am J Med Genet C Semin Med Genet. 2014 Sep;166C(3):262-75; Jelinic P et al. Nat Genet. 2014 May;46(5):424-6). 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. -

SMARCA4-related disorder

Uncertain:1

May 01, 2024

PreventionGenetics, part of Exact Sciences

Significance:Uncertain significance

Review Status:no assertion criteria provided

Collection Method:clinical testing

The SMARCA4 c.206T>C variant is predicted to result in the amino acid substitution p.Met69Thr. To our knowledge, this variant has not been reported in the literature or in a large population database, indicating this variant is rare. This variant is interpreted as a variant of uncertain significance in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/470281/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.47

BayesDel_addAF

Pathogenic

0.16

BayesDel_noAF

Uncertain

-0.010

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.64

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

Eigen

Uncertain

0.19

Eigen_PC

Uncertain

0.33

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Benign

0.77

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

M_CAP

Uncertain

0.20

MetaRNN

Uncertain

0.48

T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T;T

MetaSVM

Uncertain

0.012

MutationAssessor

Benign

1.0

L;.;.;.;L;L;.;L;L;L;L;.;L;L;L;L;L;.;.

PhyloP100

8.0

PrimateAI

Uncertain

0.73

PROVEAN

Benign

-2.4

N;.;.;.;.;.;.;.;.;.;N;.;.;N;.;N;.;N;N

REVEL

Uncertain

0.49

Sift

Uncertain

0.018

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

Sift4G

Benign

0.21

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

Polyphen

0.28

B;.;B;.;.;.;.;.;.;.;B;.;.;.;.;.;.;.;B

Vest4

0.82

MutPred

0.20

Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);Gain of phosphorylation at M69 (P = 0.0183);

MVP

0.77

MPC

0.41

ClinPred

0.91

GERP RS

5.0

PromoterAI

0.015

Neutral

(source)

Varity_R

0.43

gMVP

0.64

Mutation Taster

=40/60

disease causing

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over