2-26458102-T-C

Variant names:

• chr2-26458102-T-C
• rs1482726409
• NM_194323.3:c.3631A>G

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM1 PM2

The NM_194323.3(OTOF):​c.3631A>G​(p.Met1211Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,874 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M1211L) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: OTOF NM_194323.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.63
• 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: Uncertain_significance. The variant received 4 ACMG points.

• PM1: In a domain C2 5 (size 127) in uniprot entity OTOF_HUMAN there are 6 pathogenic changes around while only 1 benign (86%) in NM_194323.3
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OTOF	NM_194323.3	c.3631A>G	p.Met1211Val	missense_variant	Exon 29 of 29	ENST00000339598.8	NP_919304.1
OTOF	NM_194248.3	c.*136A>G		3_prime_UTR_variant	Exon 47 of 47	ENST00000272371.7	NP_919224.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OTOF	ENST00000339598.8	c.3631A>G	p.Met1211Val	missense_variant	Exon 29 of 29	1	NM_194323.3	ENSP00000344521.3
OTOF	ENST00000272371.7	c.*136A>G		3_prime_UTR_variant	Exon 47 of 47	1	NM_194248.3	ENSP00000272371.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251320 AF XY: 0.00

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461874 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44720

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26134

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53420

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111998

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

May 31, 2017

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Met1211Val variant in OTOF has not been previously reported in individuals with hearing loss, but has been identified in 1/111650 European chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broadinstitute.org). Alth ough this variant has been seen in the general population, its frequency is not high enough to rule out a pathogenic role. Computational prediction tools and co nservation analyses do not provide strong support for or against an impact to th e protein. In summary, the clinical significance of this variant is uncertain. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	15
DANN	Benign	0.96
Eigen	Benign	-0.26
Eigen_PC	Benign	-0.13
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.78	T;T
M_CAP	Uncertain	0.14	D
MetaRNN	Uncertain	0.44	T;T
MetaSVM	Benign	-0.82	T
PhyloP100		1.6
PROVEAN	Benign	-1.5	N;N
REVEL	Uncertain	0.37
Sift	Benign	0.13	T;T
Sift4G	Uncertain	0.046	D;D
Polyphen		0.0010	B;.
Vest4		0.58
MutPred		0.23		Gain of catalytic residue at M1211 (P = 0.0051);.;
MVP		0.71
ClinPred		0.34	T
GERP RS		3.6
Mutation Taster		=72/28	polymorphism

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

Other links and lift over

dbSNP: rs1482726409; hg19: chr2-26680970;