2-26461840-A-G

Variant names:

• chr2-26461840-A-G
• NM_194248.3:c.5389T>C
• OTOF p.Phe1797Leu

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_194248.3(OTOF):​c.5389T>C​(p.Phe1797Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. F1797F) has been classified as Benign. The gene OTOF is included in the ClinGen Criteria Specification Registry.

• Frequency: Genomes: not found (cov: 32)
• Consequence: OTOF NM_194248.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 9.27
• 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: Unknown, AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, G2P, Labcorp Genetics (formerly Invitae)
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Specifications for OTOF are available in the ClinGen Criteria Specification Registry and recommended for reference when assigning criteria.

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 4 uncertain in NM_194248.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.86

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_194248.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTOF	NM_194248.3	MANE Select	c.5389T>C	p.Phe1797Leu	missense	Exon 43 of 47	NP_919224.1	Q9HC10-1
	OTOF	NM_194323.3	MANE Plus Clinical	c.3088T>C	p.Phe1030Leu	missense	Exon 26 of 29	NP_919304.1	Q9HC10-2
	OTOF	NM_001287489.2		c.5389T>C	p.Phe1797Leu	missense	Exon 43 of 46	NP_001274418.1	Q9HC10-5

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTOF	ENST00000272371.7	TSL:1 MANE Select	c.5389T>C	p.Phe1797Leu	missense	Exon 43 of 47	ENSP00000272371.2	Q9HC10-1
	OTOF	ENST00000339598.8	TSL:1 MANE Plus Clinical	c.3088T>C	p.Phe1030Leu	missense	Exon 26 of 29	ENSP00000344521.3	Q9HC10-2
	OTOF	ENST00000402415.8	TSL:1	c.3148T>C	p.Phe1050Leu	missense	Exon 25 of 29	ENSP00000383906.4	A0A2U3TZT7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.34	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.61	D
Eigen	Uncertain	0.51
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.91	D
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.86	D
MetaSVM	Uncertain	0.59	D
MutationAssessor	Uncertain	2.3	M
PhyloP100		9.3
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-5.9	D
REVEL	Pathogenic	0.84
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.010	D
Varity_R		0.89
gMVP		0.83
Mutation Taster		=20/80	disease causing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr2-26684708;