chr2-26483617-CG-C

Variant names:

• chr2-26483617-CG-C
• rs397515581
• NM_194248.3:c.1236delC

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_194248.3(OTOF):​c.1236delC​(p.Glu413AsnfsTer9) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000342 in 1,460,588 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: OTOF NM_194248.3 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2 O:1
• Conservation: PhyloP100: -4.06

Genes affected

OTOF (HGNC:8515): (otoferlin) Mutations in this gene are a cause of neurosensory nonsyndromic recessive deafness, DFNB9. The short form of the encoded protein has 3 C2 domains, a single carboxy-terminal transmembrane domain found also in the C. elegans spermatogenesis factor FER-1 and human dysferlin, while the long form has 6 C2 domains. The homology suggests that this protein may be involved in vesicle membrane fusion. Several transcript variants encoding multiple isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-26483617-CG-C is Pathogenic according to our data. Variant chr2-26483617-CG-C is described in ClinVar as [Pathogenic]. Clinvar id is 65775.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-26483617-CG-C is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OTOF	NM_194248.3	c.1236delC	p.Glu413AsnfsTer9	frameshift_variant	Exon 13 of 47	ENST00000272371.7	NP_919224.1
OTOF	NM_001287489.2	c.1236delC	p.Glu413AsnfsTer9	frameshift_variant	Exon 13 of 46		NP_001274418.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OTOF	ENST00000272371.7	c.1236delC	p.Glu413AsnfsTer9	frameshift_variant	Exon 13 of 47	1	NM_194248.3	ENSP00000272371.2
OTOF	ENST00000403946.7	c.1236delC	p.Glu413AsnfsTer9	frameshift_variant	Exon 13 of 46	5		ENSP00000385255.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1460588 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 726572

Gnomad4 AFR exome AF: 0.00

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: 0.00000360

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Autosomal recessive nonsyndromic hearing loss 9 Pathogenic:1 Other:1

May 28, 2019

Mendelics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

-

GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

not provided Pathogenic:1

Apr 09, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 65775). This premature translational stop signal has been observed in individual(s) with auditory neuropathy spectrum disorder and/or bilateral nonsyndromic deafness (PMID: 18381613, 25788563, 30065612). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Glu413Asnfs*9) in the OTOF gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in OTOF are known to be pathogenic (PMID: 18381613, 19250381, 22575033). -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs397515581; hg19: chr2-26706485;