6-157207109-C-T

Variant names:

• chr6-157207109-C-T
• rs797045283
• NM_001374828.1:c.6337C>T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_001374828.1(ARID1B):​c.6337C>T​(p.Arg2113*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ARID1B NM_001374828.1 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 2.99

Genes affected

ARID1B (HGNC:18040): (AT-rich interaction domain 1B) This locus encodes an AT-rich DNA interacting domain-containing protein. The encoded protein is a component of the SWI/SNF chromatin remodeling complex and may play a role in cell-cycle activation. The protein encoded by this locus is similar to AT-rich interactive domain-containing protein 1A. These two proteins function as alternative, mutually exclusive ARID-subunits of the SWI/SNF complex. The associated complexes play opposing roles. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2016]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 19 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 6-157207109-C-T is Pathogenic according to our data. Variant chr6-157207109-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 210306.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-157207109-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ARID1B	NM_001374828.1	c.6337C>T	p.Arg2113*	stop_gained	Exon 20 of 20	ENST00000636930.2	NP_001361757.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ARID1B	ENST00000636930.2	c.6337C>T	p.Arg2113*	stop_gained	Exon 20 of 20	2	NM_001374828.1	ENSP00000490491.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Coffin-Siris syndrome 1 Pathogenic:4

Oct 31, 2014

Genetic Services Laboratory, University of Chicago

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Aug 16, 2023

3billion

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The variant is not observed in the gnomAD v2.1.1 dataset. Predicted Consequence/Location: Stop-gained (nonsense): predicted to result in a loss or disruption of normal protein function through protein truncation. Multiple pathogenic variants are reported in the predicted truncated region. The variant has been reported at least twice as pathogenic with clinical assertions and evidence for the classification (ClinVar ID: VCV000210306 /PMID: 23929686). Therefore, this variant is classified as Pathogenic according to the recommendation of ACMG/AMP guideline. -

Jan 29, 2019

Biochemical Molecular Genetic Laboratory, King Abdulaziz Medical City

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jul 15, 2021

Genome-Nilou Lab

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Pathogenic:2

Aug 16, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant in the C-terminus predicted to result in protein truncation, as the last 260 amino acids are lost, and other loss-of-function variants have been reported downstream in HGMD; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 23929686, 24090879, 24866042, 27474218, 30755392) -

Nov 19, 2018

Center for Personalized Medicine, Children's Hospital Los Angeles

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

ARID1B-related disorder Pathogenic:1

Mar 13, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The ARID1B c.5968C>T variant is predicted to result in premature protein termination (p.Arg1990*). This variant has been reported as a recurrent variant in individuals with Coffin-Siris syndrome, and it was confirmed to have occurred de novo in at least two of the reported patients (Santen et al. 2013. PubMed ID: 23929686; Patient #8 in Figure 1, Mignot et al. 2016. PubMed ID: 27474218). This variant has not been reported in a large population database, indicating this variant is rare. Nonsense variants in ARID1B are expected to be pathogenic. This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.61	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	40
DANN	Uncertain	1.0
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.54
FATHMM_MKL	Uncertain	0.96	D
Vest4		0.86
GERP RS		5.3

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

Other links and lift over

dbSNP: rs797045283; hg19: chr6-157528243; COSMIC: COSV51666367;