NM_001292063.2:c.7585+2T>C

Variant names:

• chr11-17634950-T-C
• rs1401870617
• NM_001292063.2:c.7585+2T>C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_001292063.2(OTOG):​c.7585+2T>C variant causes a splice donor, intron change. The variant allele was found at a frequency of 0.00000216 in 1,386,508 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 Likely pathogenic (★).

• Frequency:
  • Genomes: 𝑓 0.0000075 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000016 (0 hom.)
• Consequence: OTOG NM_001292063.2 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.99

Genes affected

OTOG (HGNC:8516): (otogelin) The protein encoded by this gene is a component of the acellular membranes of the inner ear. Disruption of the orthologous mouse gene shows that it plays a role in auditory and vestibular functions. It is involved in fibrillar network organization, the anchoring of otoconial membranes and cupulae to the neuroepithelia, and likely in sound stimulation resistance. Mutations in this gene cause autosomal recessive nonsyndromic deafness, type 18B. Alternative splicing of this gene results in multiple transcript variants. [provided by RefSeq, May 2014]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.012010981 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-17634950-T-C is Pathogenic according to our data. Variant chr11-17634950-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 505310.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OTOG	NM_001292063.2	c.7585+2T>C		splice_donor_variant, intron_variant	Intron 45 of 55	ENST00000399397.6	NP_001278992.1
OTOG	NM_001277269.2	c.7621+2T>C		splice_donor_variant, intron_variant	Intron 44 of 54		NP_001264198.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OTOG	ENST00000399397.6	c.7585+2T>C		splice_donor_variant, intron_variant	Intron 45 of 55	5	NM_001292063.2	ENSP00000382329.2
OTOG	ENST00000399391.7	c.7621+2T>C		splice_donor_variant, intron_variant	Intron 44 of 54	5		ENSP00000382323.2
OTOG	ENST00000342528.2	n.4606-660T>C		intron_variant	Intron 19 of 21	2

Frequencies

GnomAD3 genomes AF: 0.00000749 AC: 1 AN: 133458 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000279

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000160 AC: 2 AN: 1253050 Hom.: 0 Cov.: 35 AF XY: 0.00000161 AC XY: 1 AN XY: 621156

Gnomad4 AFR exome AF: 0.0000701

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000749 AC: 1 AN: 133458 Hom.: 0 Cov.: 31 AF XY: 0.0000155 AC XY: 1 AN XY: 64350

Gnomad4 AFR AF: 0.0000279

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000113

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Oct 06, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.7621+2T>C variant in OTOG has not been previously reported in individuals with hearing loss. Data from large population studies is insufficient to assess the frequency of this variant. This variant occurs in the invariant region (+/- 1,2) of the splice consensus sequence and is predicted to cause altered splicin g leading to an abnormal or absent protein. Two loss of function variants in the OTOG gene have been reported to segregate with hearing loss in two families (Sc hraders 2012), and disruption of Otog in mice resulted in deafness supporting of a loss-of-function mechanism for the disease (Simmler 2000). In summary, althou gh additional evidence is required to strengthen the gene-disease association be tween OTOG and hearing loss, currently available data support that the c.7621+2T >C variant is likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	27
DANN	Uncertain	1.0
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.84
FATHMM_MKL	Pathogenic	0.98	D
GERP RS		5.4

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.96
SpliceAI score (max)		0.91		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.91		Position offset: -2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1401870617; hg19: chr11-17656497;