rs370132645

Variant names:

• chr2-26475912-A-C
• rs370132645
• NM_194248.3:c.2991+2T>G

Variant summary

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

The NM_194248.3(OTOF):​c.2991+2T>G variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000117 in 1,451,072 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: 0.000012 (0 hom.)
• Consequence: OTOF NM_194248.3 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.26
• Publications: 0 publications found

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]

OTOF Gene-Disease associations (from GenCC):

• autosomal recessive nonsyndromic hearing loss 9

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

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 2-26475912-A-C is Pathogenic according to our data. Variant chr2-26475912-A-C is described in ClinVar as Pathogenic. ClinVar VariationId is 178509.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OTOF	NM_194248.3	c.2991+2T>G		splice_donor_variant, intron_variant	Intron 24 of 46	ENST00000272371.7	NP_919224.1
OTOF	NM_194323.3	c.750+2T>G		splice_donor_variant, intron_variant	Intron 7 of 28	ENST00000339598.8	NP_919304.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OTOF	ENST00000272371.7	c.2991+2T>G		splice_donor_variant, intron_variant	Intron 24 of 46	1	NM_194248.3	ENSP00000272371.2
OTOF	ENST00000339598.8	c.750+2T>G		splice_donor_variant, intron_variant	Intron 7 of 28	1	NM_194323.3	ENSP00000344521.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000117 AC: 17 AN: 1451072 Hom.: 0 Cov.: 33 AF XY: 0.00000555 AC XY: 4 AN XY: 720868

African (AFR) AF: 0.00 AC: 0 AN: 33346

American (AMR) AF: 0.00 AC: 0 AN: 43558

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25888

East Asian (EAS) AF: 0.00 AC: 0 AN: 39452

South Asian (SAS) AF: 0.00 AC: 0 AN: 84518

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51226

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 0.0000144 AC: 16 AN: 1107312

Other (OTH) AF: 0.0000167 AC: 1 AN: 60018

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000111 Hom.: 0

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.00000829 AC: 1

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Jun 03, 2014

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The 2991+2T>G variant in OTOF has not been previously reported in individuals wi th hearing loss, but has been identified in 0.01% (1/8590) of European American chromosomes by the NHLBI Exome Sequencing Project (http://evs.gs.washington.edu/ EVS/; dbSNP rs370132645). Although this variant has been seen in the general pop ulation, its frequency is low enough to be consistent with a recessive carrier f requency. This variant occurs in the invariant region (+/- 1/2) of the splice co nsensus sequence and is predicted to cause altered splicing leading to an abnorm al or absent protein. In summary, this variant meets our criteria to be classifi ed as pathogenic (http://pcpgm.partners.org/LMM). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Pathogenic	0.99
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	1.0	D
PhyloP100		9.3
GERP RS		4.1
Mutation Taster		=0/100	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.92
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.67		Position offset: 16
DS_DL_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: rs370132645; hg19: chr2-26698780;