2-26457897-C-T

Position:

• chr2-26457897-C-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 0P and 8B. BP4_Strong BS2

The NM_194248.3(OTOF):​c.*341G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00476 in 848,142 control chromosomes in the GnomAD database, including 17 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0042 (2 hom., cov: 33)
  • Exomes 𝑓: 0.0049 (15 hom.)
• Consequence: OTOF NM_194248.3 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.456

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 -8 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.82).
• 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.*341G>A		3_prime_UTR_variant	47/47	ENST00000272371.7	NP_919224.1
OTOF	NM_194323.3	c.*143G>A		3_prime_UTR_variant	29/29	ENST00000339598.8	NP_919304.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OTOF	ENST00000272371	c.*341G>A		3_prime_UTR_variant	47/47	1	NM_194248.3	ENSP00000272371.2
OTOF	ENST00000339598	c.*143G>A		3_prime_UTR_variant	29/29	1	NM_194323.3	ENSP00000344521.3

Frequencies

GnomAD3 genomes AF: 0.00421 AC: 640 AN: 152010 Hom.: 2 Cov.: 33

Gnomad AFR AF: 0.00111

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00432

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000622

Gnomad FIN AF: 0.00160

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00746

Gnomad OTH AF: 0.000478

GnomAD4 exome AF: 0.00488 AC: 3399 AN: 696014 Hom.: 15 Cov.: 9 AF XY: 0.00473 AC XY: 1716 AN XY: 362510

Gnomad4 AFR exome AF: 0.000788

Gnomad4 AMR exome AF: 0.00292

Gnomad4 ASJ exome AF: 0.000127

Gnomad4 EAS exome AF: 0.0000560

Gnomad4 SAS exome AF: 0.000305

Gnomad4 FIN exome AF: 0.00268

Gnomad4 NFE exome AF: 0.00650

Gnomad4 OTH exome AF: 0.00360

GnomAD4 genome AF: 0.00421 AC: 640 AN: 152128 Hom.: 2 Cov.: 33 AF XY: 0.00352 AC XY: 262 AN XY: 74362

Gnomad4 AFR AF: 0.00111

Gnomad4 AMR AF: 0.00432

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000622

Gnomad4 FIN AF: 0.00160

Gnomad4 NFE AF: 0.00746

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.00635 Hom.: 1

Bravo AF: 0.00409

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive nonsyndromic hearing loss 9 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 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	-0.82
CADD	Benign	0.77
DANN	Benign	0.75

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs549185736; hg19: chr2-26680765;