NM_001387283.1:c.979C>G

Variant names:

Variant summary

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

The NM_001387283.1(SMARCA4):c.979C>G(p.Pro327Ala) 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 (★★). Synonymous variant affecting the same amino acid position (i.e. P327P) 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

Scores

Clinical Significance

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

Conservation

PhyloP100: 4.79

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:

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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 the SMARCA4 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 59 curated pathogenic missense variants (we use a threshold of 10). The gene has 56 curated benign missense variants. Gene score misZ: 6.8459 (above the threshold of 3.09). Trascript score misZ: 8.7957 (above the threshold of 3.09). GenCC associations: The gene is linked to 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 rank	MANE	Protein	UniProt
SMARCA4	NM_001387283.1 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 6 of 36	ENST00000646693.2	NP_001374212.1
SMARCA4	NM_003072.5 link	c.979C>G	p.Pro327Ala	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.979C>G	p.Pro327Ala	missense_variant	Exon 6 of 36		NM_001387283.1	ENSP00000495368.1	Q9HBD4
SMARCA4	ENST00000344626.10 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 6 of 35	1	NM_003072.5	ENSP00000343896.4	P51532-1
SMARCA4	ENST00000643549.1 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 6 of 35			ENSP00000493975.1	A0A2R8Y4P4
SMARCA4	ENST00000541122.6 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 7 of 35	5		ENSP00000445036.2	P51532-4
SMARCA4	ENST00000643296.1 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 6 of 34			ENSP00000496635.1	P51532-4
SMARCA4	ENST00000644737.1 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 6 of 34			ENSP00000495548.1	P51532-4
SMARCA4	ENST00000589677.5 link	c.979C>G	p.Pro327Ala	missense_variant	Exon 7 of 35	5		ENSP00000464778.1	P51532-3
SMARCA4	ENST00000643995.1 link	c.391C>G	p.Pro131Ala	missense_variant	Exon 3 of 32			ENSP00000496004.1	A0A2R8YGG3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.91e-7

AC:

AN:

1448010

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

719334

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

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:

9.04e-7

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

Jul 24, 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 alanine, which is neutral and non-polar, at codon 327 of the SMARCA4 protein (p.Pro327Ala). 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: 2587143). 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

Aug 30, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.P327A variant (also known as c.979C>G), located in coding exon 5 of the SMARCA4 gene, results from a C to G substitution at nucleotide position 979. The proline at codon 327 is replaced by alanine, an amino acid with highly 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 syndrome is unlikely. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Uncertain

0.077

BayesDel_noAF

Benign

-0.13

CADD

Uncertain

DANN

Uncertain

0.98

DEOGEN2

Uncertain

0.47

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

Eigen

Uncertain

0.20

Eigen_PC

Benign

0.21

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.93

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

M_CAP

Pathogenic

0.31

MetaRNN

Uncertain

0.51

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

MetaSVM

Uncertain

0.55

MutationAssessor

Uncertain

2.0

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

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-2.3

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

REVEL

Uncertain

0.51

Sift

Benign

0.042

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

Sift4G

Benign

0.24

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

Polyphen

0.78

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

Vest4

0.49

MutPred

0.26

Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);Loss of catalytic residue at P327 (P = 0.0188);

MVP

0.65

MPC

0.31

ClinPred

0.66

GERP RS

4.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.12

gMVP

0.25

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

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over