chr16-21705044-T-G

Variant names:

• chr16-21705044-T-G
• rs201435154
• NM_144672.4:c.981-125T>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_170664.3(OTOA):​c.8+7T>G variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000759 in 1,317,678 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.6e-7 (0 hom.)
• Consequence: OTOA NM_170664.3 splice_region, intron
• Scores: Splicing: ADA: 0.00002683
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.816
• 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_170664.3. 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
	OTOA	NM_144672.4	MANE Select	c.981-125T>G		intron	N/A	NP_653273.3
	OTOA	NM_001161683.2		c.744-125T>G		intron	N/A	NP_001155155.1
	OTOA	NM_170664.3		c.8+7T>G		splice_region intron	N/A	NP_733764.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OTOA	ENST00000646100.2	MANE Select	c.981-125T>G		intron	N/A	ENSP00000496564.2
	OTOA	ENST00000388958.8	TSL:1	c.981-125T>G		intron	N/A	ENSP00000373610.3
	OTOA	ENST00000286149.8	TSL:5	c.1023-125T>G		intron	N/A	ENSP00000286149.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.59e-7 AC: 1 AN: 1317678 Hom.: 0 Cov.: 22 AF XY: 0.00 AC XY: 0 AN XY: 662784

African (AFR) AF: 0.00 AC: 0 AN: 30474

American (AMR) AF: 0.00 AC: 0 AN: 44532

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25272

East Asian (EAS) AF: 0.00 AC: 0 AN: 38984

South Asian (SAS) AF: 0.00 AC: 0 AN: 83226

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53362

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4240

European-Non Finnish (NFE) AF: 0.00000102 AC: 1 AN: 981952

Other (OTH) AF: 0.00 AC: 0 AN: 55636

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	8.9
DANN	Benign	0.42
PhyloP100		0.82
PromoterAI		-0.025	Neutral

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.000027
dbscSNV1_RF	Benign	0.0040
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: rs201435154; hg19: chr16-21716365;