chr2-26460202-C-T

Variant names:

• chr2-26460202-C-T
• rs397517950
• NM_194248.3:c.5817G>A

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2 BP4_Moderate BP7

The NM_194248.3(OTOF):​c.5817G>A​(p.Arg1939Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000069 in 1,448,386 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign 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. R1939R) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: OTOF NM_194248.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0840
• 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: Likely_benign. The variant received -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.45).
• BP7: Synonymous conserved (PhyloP=-0.084 with no splicing effect.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTOF	NM_194248.3	MANE Select	c.5817G>A	p.Arg1939Arg	synonymous	Exon 46 of 47	NP_919224.1
	OTOF	NM_194323.3	MANE Plus Clinical	c.3512+445G>A		intron	N/A	NP_919304.1
	OTOF	NM_194322.3		c.3747G>A	p.Arg1249Arg	synonymous	Exon 28 of 29	NP_919303.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTOF	ENST00000272371.7	TSL:1 MANE Select	c.5817G>A	p.Arg1939Arg	synonymous	Exon 46 of 47	ENSP00000272371.2
	OTOF	ENST00000402415.8	TSL:1	c.3576G>A	p.Arg1192Arg	synonymous	Exon 28 of 29	ENSP00000383906.4
	OTOF	ENST00000338581.10	TSL:1	c.3516G>A	p.Arg1172Arg	synonymous	Exon 29 of 30	ENSP00000345137.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.90e-7 AC: 1 AN: 1448386 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 719130

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33244

American (AMR) AF: 0.00 AC: 0 AN: 43042

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25912

East Asian (EAS) AF: 0.00 AC: 0 AN: 39324

South Asian (SAS) AF: 0.00 AC: 0 AN: 84036

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52518

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4298

European-Non Finnish (NFE) AF: 9.04e-7 AC: 1 AN: 1106148

Other (OTH) AF: 0.00 AC: 0 AN: 59864

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.45
CADD	Benign	8.0
DANN	Benign	0.76
PhyloP100		-0.084
Mutation Taster		=100/0	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: rs397517950; hg19: chr2-26683070;