chr8-91071136-A-G

Variant names:

• chr8-91071136-A-G
• rs1064797102
• NM_016023.5:c.83-2A>G

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_016023.5(OTUD6B):​c.83-2A>G variant causes a splice acceptor, intron change. The variant allele was found at a frequency of 0.00000137 in 1,459,624 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: OTUD6B NM_016023.5 splice_acceptor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 6.77
• Publications: 4 publications found

Genes affected

OTUD6B (HGNC:24281): (OTU deubiquitinase 6B) This gene encodes a member of the ovarian tumor domain (OTU)-containing subfamily of deubiquitinating enzymes. Deubiquitinating enzymes are primarily involved in removing ubiquitin from proteins targeted for degradation. This protein may function as a negative regulator of the cell cycle in B cells. [provided by RefSeq, Nov 2013]

OTUD6B Gene-Disease associations (from GenCC):

• intellectual developmental disorder with dysmorphic facies, seizures, and distal limb anomalies

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, LoF is a know mechanism of disease, No cryptic splice site detected. Exon removal results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 8-91071136-A-G is Pathogenic according to our data. Variant chr8-91071136-A-G is described in ClinVar as Pathogenic. ClinVar VariationId is 375703.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016023.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTUD6B	NM_016023.5	MANE Select	c.83-2A>G		splice_acceptor intron	N/A	NP_057107.4
	OTUD6B	NM_001416022.1		c.83-2A>G		splice_acceptor intron	N/A	NP_001402951.1
	OTUD6B	NM_001286745.3		c.-361-2A>G		splice_acceptor intron	N/A	NP_001273674.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTUD6B	ENST00000404789.8	TSL:1 MANE Select	c.83-2A>G		splice_acceptor intron	N/A	ENSP00000384190.4
	OTUD6B	ENST00000285420.8	TSL:1	c.173-2A>G		splice_acceptor intron	N/A	ENSP00000285420.4
	OTUD6B	ENST00000617869.4	TSL:1	c.173-2A>G		splice_acceptor intron	N/A	ENSP00000483706.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1459624 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726132

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

African (AFR) AF: 0.00 AC: 0 AN: 33270

American (AMR) AF: 0.00 AC: 0 AN: 44156

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26084

East Asian (EAS) AF: 0.00 AC: 0 AN: 39654

South Asian (SAS) AF: 0.00 AC: 0 AN: 85752

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53350

Middle Eastern (MID) AF: 0.000347 AC: 2 AN: 5766

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111300

Other (OTH) AF: 0.00 AC: 0 AN: 60292

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.00000000770867), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions as Germline

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Epilepsy;C0432072:Dysmorphic features;C3714756:Intellectual disability (1)
1	-	-	Intellectual developmental disorder with dysmorphic facies, seizures, and distal limb anomalies (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Uncertain	0.050
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.98	D
PhyloP100		6.8
GERP RS		5.3
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.94
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.94		Position offset: 13
DS_AL_spliceai		1.0		Position offset: 2

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

Other links and lift over

dbSNP: rs1064797102; hg19: chr8-92083364;