16-21730851-G-A

Variant names:

• chr16-21730851-G-A
• rs727505120
• NM_144672.4:c.2222G>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PVS1 PM2

The NM_144672.4(OTOA):​c.2222G>A​(p.Trp741*) variant causes a stop gained change. 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. Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: OTOA NM_144672.4 stop_gained
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.55
• Publications: 0 publications found

Genes affected

OTOA (HGNC:16378): (otoancorin) The protein encoded by this gene is specifically expressed in the inner ear, and is located at the interface between the apical surface of the inner ear sensory epithelia and their overlying acellular gels. It is prposed that this protein is involved in the attachment of the inner ear acellular gels to the apical surface of the underlying nonsensory cells. Mutations in this gene are associated with autosomal recessive deafness type 22 (DFNB22). Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2009]

OTOA Gene-Disease associations (from GenCC):

• autosomal recessive nonsyndromic hearing loss 22

  Inheritance: AR Classification: DEFINITIVE, STRONG, LIMITED Submitted by: Laboratory for Molecular Medicine, G2P, PanelApp Australia, Labcorp Genetics (formerly Invitae)
• nonsyndromic genetic hearing loss

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_144672.4. 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
	OTOA	NM_144672.4	MANE Select	c.2222G>A	p.Trp741*	stop_gained	Exon 21 of 29	NP_653273.3
	OTOA	NM_001161683.2		c.1985G>A	p.Trp662*	stop_gained	Exon 16 of 24	NP_001155155.1
	OTOA	NM_170664.3		c.1250G>A	p.Trp417*	stop_gained	Exon 11 of 19	NP_733764.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTOA	ENST00000646100.2	MANE Select	c.2222G>A	p.Trp741*	stop_gained	Exon 21 of 29	ENSP00000496564.2
	OTOA	ENST00000388958.8	TSL:1	c.2222G>A	p.Trp741*	stop_gained	Exon 20 of 28	ENSP00000373610.3
	OTOA	ENST00000286149.8	TSL:5	c.2264G>A	p.Trp755*	stop_gained	Exon 20 of 28	ENSP00000286149.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1421292 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 707712

African (AFR) AF: 0.00 AC: 0 AN: 33314

American (AMR) AF: 0.00 AC: 0 AN: 43536

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25268

East Asian (EAS) AF: 0.00 AC: 0 AN: 38808

South Asian (SAS) AF: 0.00 AC: 0 AN: 82500

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52560

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5496

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1081226

Other (OTH) AF: 0.00 AC: 0 AN: 58584

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.59
CADD	Pathogenic	42
DANN	Uncertain	0.99
Eigen	Pathogenic	0.74
Eigen_PC	Uncertain	0.57
FATHMM_MKL	Uncertain	0.89	D
PhyloP100		5.6
Vest4		0.47
GERP RS		4.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.43		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.43		Position offset: -14

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs727505120; hg19: chr16-21742172;