Genetic Variant ARID1B:p.Gly396_Gly398dup (chr6-156778847-G-GGGCGGCGGC) – ACMG Classification: Benign (-10 pts)

Variant summary

Our verdict is Benign. The variant received -10 ACMG points: 0P and 10B. BP3BP6BS1BS2

The NM_001374828.1(ARID1B):c.1185_1193dupCGGCGGCGG(p.Gly396_Gly398dup) variant causes a disruptive inframe insertion change. The variant allele was found at a frequency of 0.0000449 in 1,403,408 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. G398G) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000068 ( 0 hom., cov: 29)

Exomes 𝑓: 0.000042 ( 0 hom. )

Consequence

ARID1B
NM_001374828.1 disruptive_inframe_insertion

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 4.68

Publications

1 publications found

Variant links:

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]

ARID1B Gene-Disease associations (from GenCC):

Coffin-Siris syndrome
Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Illumina, Orphanet, ClinGen
Coffin-Siris syndrome 1
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics

ARID1B links:

ENSG00000296922 (HGNC:):

ENSG00000296922 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -10 ACMG points.

BP3

Nonframeshift variant in repetitive region in NM_001374828.1

BP6

Variant 6-156778847-G-GGGCGGCGGC is Benign according to our data. Variant chr6-156778847-G-GGGCGGCGGC is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 2038419.

BS1

Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.0000676 (10/147822) while in subpopulation AMR AF = 0.000467 (7/14996). AF 95% confidence interval is 0.000219. There are 0 homozygotes in GnomAd4. There are 3 alleles in the male GnomAd4 subpopulation. Median coverage is 29. This position passed quality control check.

BS2

High AC in GnomAd4 at 10 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001374828.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
ARID1B	NM_001374828.1	MANE Select	c.1185_1193dupCGGCGGCGG	p.Gly396_Gly398dup	disruptive_inframe_insertion	Exon 1 of 20	NP_001361757.1	A0A6Q8NVI4
ARID1B	NM_001438482.1		c.1185_1193dupCGGCGGCGG	p.Gly396_Gly398dup	disruptive_inframe_insertion	Exon 1 of 21	NP_001425411.1
ARID1B	NM_001438483.1		c.1185_1193dupCGGCGGCGG	p.Gly396_Gly398dup	disruptive_inframe_insertion	Exon 1 of 21	NP_001425412.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
ARID1B	ENST00000636930.2	TSL:2 MANE Select	c.1185_1193dupCGGCGGCGG	p.Gly396_Gly398dup	disruptive_inframe_insertion	Exon 1 of 20	ENSP00000490491.2	A0A6Q8NVI4
ARID1B	ENST00000346085.10	TSL:1	c.1185_1193dupCGGCGGCGG	p.Gly396_Gly398dup	disruptive_inframe_insertion	Exon 2 of 21	ENSP00000344546.5	A0A3F2YNW7
ARID1B	ENST00000350026.11	TSL:1	c.1185_1193dupCGGCGGCGG	p.Gly396_Gly398dup	disruptive_inframe_insertion	Exon 1 of 19	ENSP00000055163.8	Q8NFD5-5

Frequencies

GnomAD3 genomes

AF:

0.0000676

AC:

AN:

147822

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000467

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000429

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000150

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000422

AC:

AN:

1255586

Hom.:

Cov.:

AF XY:

0.0000454

AC XY:

AN XY:

617180

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:

24704

American (AMR)

AF:

0.0000586

AC:

AN:

17064

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

20426

East Asian (EAS)

AF:

0.000507

AC:

AN:

27600

South Asian (SAS)

AF:

0.0000341

AC:

AN:

58586

European-Finnish (FIN)

AF:

0.0000236

AC:

AN:

42444

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5046

European-Non Finnish (NFE)

AF:

0.0000278

AC:

AN:

1009002

Other (OTH)

AF:

0.000138

AC:

AN:

50714

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000000000569766), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.397

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:

0.0000676

AC:

AN:

147822

Hom.:

Cov.:

AF XY:

0.0000416

AC XY:

AN XY:

72166

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

40194

American (AMR)

AF:

0.000467

AC:

AN:

14996

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3420

East Asian (EAS)

AF:

0.00

AC:

AN:

4882

South Asian (SAS)

AF:

0.000429

AC:

AN:

4664

European-Finnish (FIN)

AF:

0.00

AC:

AN:

9854

Middle Eastern (MID)

AF:

0.00

AC:

AN:

300

European-Non Finnish (NFE)

AF:

0.0000150

AC:

AN:

66596

Other (OTH)

AF:

0.00

AC:

AN:

2042

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome 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

Alfa

AF:

0.0000395

Hom.:

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

ARID1B-related disorder (1)

not provided (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

4.7

Mutation Taster

=78/22

polymorphism

(source)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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6-156778847-GGGCGGCGGCGGCGGCGGCGGC-GGGCGGCGGCGGCGGCGGCGGCGGCGGCGGC

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over