2-26460718-C-T

Position:

• chr2-26460718-C-T

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6 BP7 BS2

The NM_194248.3(OTOF):​c.5742G>A​(p.Leu1914=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00183 in 1,614,062 control chromosomes in the GnomAD database, including 5 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.0018 (2 hom., cov: 32)
  • Exomes 𝑓: 0.0018 (3 hom.)
• Consequence: OTOF NM_194248.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:6
• Conservation: PhyloP100: 0.0440

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 Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 2-26460718-C-T is Benign according to our data. Variant chr2-26460718-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 48269.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Benign=4, Uncertain_significance=2}. Variant chr2-26460718-C-T is described in Lovd as [Likely_benign].
• BP7: Synonymous conserved (PhyloP=0.044 with no splicing effect.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OTOF	NM_194248.3	c.5742G>A	p.Leu1914=	synonymous_variant	45/47	ENST00000272371.7	NP_919224.1
OTOF	NM_194323.3	c.3441G>A	p.Leu1147=	synonymous_variant	28/29	ENST00000339598.8	NP_919304.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OTOF	ENST00000272371.7	c.5742G>A	p.Leu1914=	synonymous_variant	45/47	1	NM_194248.3	ENSP00000272371	A1
OTOF	ENST00000339598.8	c.3441G>A	p.Leu1147=	synonymous_variant	28/29	1	NM_194323.3	ENSP00000344521

Frequencies

GnomAD3 genomes AF: 0.00184 AC: 280 AN: 152100 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000786

Gnomad ASJ AF: 0.00490

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00198

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00319

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.00173 AC: 435 AN: 251172 Hom.: 0 AF XY: 0.00165 AC XY: 224 AN XY: 135766

Gnomad AFR exome AF: 0.000308

Gnomad AMR exome AF: 0.000926

Gnomad ASJ exome AF: 0.00228

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00255

Gnomad NFE exome AF: 0.00269

Gnomad OTH exome AF: 0.00245

GnomAD4 exome AF: 0.00183 AC: 2671 AN: 1461844 Hom.: 3 Cov.: 35 AF XY: 0.00186 AC XY: 1353 AN XY: 727224

Gnomad4 AFR exome AF: 0.000269

Gnomad4 AMR exome AF: 0.00103

Gnomad4 ASJ exome AF: 0.00302

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00285

Gnomad4 NFE exome AF: 0.00206

Gnomad4 OTH exome AF: 0.00152

GnomAD4 genome AF: 0.00184 AC: 280 AN: 152218 Hom.: 2 Cov.: 32 AF XY: 0.00180 AC XY: 134 AN XY: 74430

Gnomad4 AFR AF: 0.000241

Gnomad4 AMR AF: 0.000785

Gnomad4 ASJ AF: 0.00490

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00198

Gnomad4 NFE AF: 0.00319

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.00317 Hom.: 2

Bravo AF: 0.00128

EpiCase AF: 0.00240

EpiControl AF: 0.00184

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:6

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1 Benign:4

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Sep 12, 2016	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	May 12, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jun 05, 2019	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2023	OTOF: BP4, BP7 -

not specified Benign:2

Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Jul 05, 2017	p.Leu1914Leu in exon 45 of OTOF: This variant is not expected to have clinical s ignificance because it does not alter an amino acid residue, is not located with in the splice consensus sequence, and has been identified in 0.3% (409/126530) o f European chromosomes including 2 homozygotes by the genome Aggregation Databas e (gnomAD, http://gnomad.broadinstitute.org; dbSNP rs141235641). -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 14, 2023	- -

Autosomal recessive nonsyndromic hearing loss 9 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
CADD	Benign	5.0
DANN	Benign	0.75

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs141235641; hg19: chr2-26683586;