chr16-21730867-G-C

Variant names:

• chr16-21730867-G-C
• rs72640475
• NM_144672.4:c.2238G>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_144672.4(OTOA):​c.2238G>C​(p.Thr746Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. T746T) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: OTOA NM_144672.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.08
• Publications: 5 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: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BP7: Synonymous conserved (PhyloP=-2.08 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OTOA	NM_144672.4	c.2238G>C	p.Thr746Thr	synonymous_variant	Exon 21 of 29	ENST00000646100.2	NP_653273.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OTOA	ENST00000646100.2	c.2238G>C	p.Thr746Thr	synonymous_variant	Exon 21 of 29		NM_144672.4	ENSP00000496564.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD2 exomes AF: 0.00 AC: 0 AN: 240440 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: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 1422872 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 708370

African (AFR) AF: 0.00 AC: 0 AN: 33316

American (AMR) AF: 0.00 AC: 0 AN: 43178

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25300

East Asian (EAS) AF: 0.00 AC: 0 AN: 37454

South Asian (SAS) AF: 0.00 AC: 0 AN: 82634

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52376

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5512

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1084556

Other (OTH) AF: 0.00 AC: 0 AN: 58546

GnomAD4 genome Cov.: 31

Alfa AF: 0.0000214 Hom.: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	0.10
DANN	Benign	0.61
PhyloP100		-2.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs72640475; hg19: chr16-21742188;