Genetic Variant ARID1A:p.Gln372AlafsTer28 (chr1-26697510-C-CG) – ACMG Classification: Likely_pathogenic (8 pts)

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PVS1

The NM_006015.6(ARID1A):c.1113dupG(p.Gln372AlafsTer28) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000104 in 1,252,600 control chromosomes in the GnomAD database, with no homozygous occurrence. There is a variant allele frequency bias in the population database for this variant (GnomAdExome4), which may indicate mosaicism or somatic mutations in the reference population data. Variant has been reported in ClinVar as Uncertain_significance (no stars). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.000010 ( 0 hom. )

Consequence

ARID1A
NM_006015.6 frameshift

Scores

Not classified

Clinical Significance

- - O:1

Conservation

PhyloP100: 1.13

Publications

0 publications found

Variant links:

Genes affected

ARID1A (HGNC:11110): (AT-rich interaction domain 1A) This gene encodes a member of the SWI/SNF family, whose members 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. It possesses at least two conserved domains that could be important for its function. First, it has a DNA-binding domain that can specifically bind an AT-rich DNA sequence known to be recognized by a SNF/SWI complex at the beta-globin locus. Second, the C-terminus of the protein can stimulate glucocorticoid receptor-dependent transcriptional activation. It is thought that the protein encoded by this gene confers specificity to the SNF/SWI complex and may recruit the complex to its targets through either protein-DNA or protein-protein interactions. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ARID1A Gene-Disease associations (from GenCC):

Coffin-Siris syndrome
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, ClinGen
intellectual disability, autosomal dominant 14
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Illumina, G2P, Labcorp Genetics (formerly Invitae)

ARID1A links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARID1A	NM_006015.6 link	c.1113dupG	p.Gln372AlafsTer28	frameshift_variant	Exon 1 of 20	ENST00000324856.13	NP_006006.3	O14497-1
ARID1A	NM_139135.4 link	c.1113dupG	p.Gln372AlafsTer28	frameshift_variant	Exon 1 of 20		NP_624361.1	O14497-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARID1A	ENST00000324856.13 link	c.1113dupG	p.Gln372AlafsTer28	frameshift_variant	Exon 1 of 20	1	NM_006015.6	ENSP00000320485.7		O14497-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.000118

AC:

AN:

33852

AF XY:

0.0000481

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000385

Gnomad ASJ exome

AF:

0.000296

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000818

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000104

AC:

AN:

1252600

Hom.:

Cov.:

AF XY:

0.0000146

AC XY:

AN XY:

615460

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

24632

American (AMR)

AF:

0.000132

AC:

AN:

15152

Ashkenazi Jewish (ASJ)

AF:

0.0000501

AC:

AN:

19960

East Asian (EAS)

AF:

0.00

AC:

AN:

27718

South Asian (SAS)

AF:

0.0000330

AC:

AN:

60628

European-Finnish (FIN)

AF:

0.00

AC:

AN:

30392

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3580

European-Non Finnish (NFE)

AF:

0.00000785

AC:

AN:

1018880

Other (OTH)

AF:

0.00

AC:

AN:

51658

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

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

Cov.:

ClinVar

Significance: -

Submissions summary: Other:1

Revision: -

LINK: link

Submissions by phenotype

Neoplasm

Other:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:-

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.1

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

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1-26697510-CG-CGG

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