19-10984159-C-T

Position:

chr19-10984159-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2PP2

The NM_001387283.1(SMARCA4):c.8C>T(p.Thr3Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,432 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. T3N) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

SMARCA4
NM_001387283.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 6.08

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 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.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMARCA4	NM_001387283.1 linkuse as main transcript	c.8C>T	p.Thr3Ile	missense_variant	2/36	ENST00000646693.2
SMARCA4	NM_003072.5 linkuse as main transcript	c.8C>T	p.Thr3Ile	missense_variant	2/35	ENST00000344626.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMARCA4	ENST00000646693.2 linkuse as main transcript	c.8C>T	p.Thr3Ile	missense_variant	2/36		NM_001387283.1
SMARCA4	ENST00000344626.10 linkuse as main transcript	c.8C>T	p.Thr3Ile	missense_variant	2/35	1	NM_003072.5	P4	P51532-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000404

AC:

AN:

247758

Hom.:

AF XY:

0.00

AC XY:

AN XY:

134544

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461432

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727036

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Rhabdoid tumor predisposition syndrome 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 17, 2023

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. ClinVar contains an entry for this variant (Variation ID: 1500930). This variant has not been reported in the literature in individuals affected with SMARCA4-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.003%). This sequence change replaces threonine, which is neutral and polar, with isoleucine, which is neutral and non-polar, at codon 3 of the SMARCA4 protein (p.Thr3Ile). -

Hereditary cancer-predisposing syndrome

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 01, 2023

The p.T3I variant (also known as c.8C>T), located in coding exon 1 of the SMARCA4 gene, results from a C to T substitution at nucleotide position 8. The threonine at codon 3 is replaced by isoleucine, an amino acid with similar properties. 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 Coffin-Siris syndrome is unknown; however, the association of this alteration with rhabdoid tumor predisposition syndrome is unlikely. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.72

BayesDel_addAF

Uncertain

0.095

BayesDel_noAF

Uncertain

-0.020

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.42

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

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.48

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

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

M_CAP

Uncertain

0.28

MetaRNN

Uncertain

0.45

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

MetaSVM

Uncertain

0.26

MutationAssessor

Benign

1.0

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

MutationTaster

Benign

1.0

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

PrimateAI

Uncertain

0.72

PROVEAN

Benign

-2.0

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

REVEL

Uncertain

0.54

Sift

Uncertain

0.0020

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

Sift4G

Uncertain

0.024

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

Polyphen

0.61

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

Vest4

0.52

MutPred

0.24

Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);Loss of phosphorylation at T3 (P = 0.0012);

MVP

0.74

MPC

0.27

ClinPred

0.64

GERP RS

5.0

Varity_R

0.34

gMVP

0.22

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over