Genetic Variant OTOP1:p.Cys467Tyr (chr4-4197434-C-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_177998.3(OTOP1):c.1400G>A(p.Cys467Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000226 in 1,461,882 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.000023 ( 0 hom. )

Consequence

OTOP1
NM_177998.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.78

Variant links:

Genes affected

OTOP1 (HGNC:19656): (otopetrin 1) This gene encodes a transmembrane protein which belongs to the otopetrin domain protein family and is required for the formation of otoconia and otoliths, calcium carbonate biominerals within the inner ear of mammals that are required for the detection of linear acceleration and gravity. This gene modulates purinergic control of intracellular calcium in vestibular supporting cells. Naturally occurring mutations in the orthologous mouse gene are associated with nonsyndromic otoconia agenesis and a consequent balance defect. The orthologous mouse gene is also induced in white adipose tissue during obesity. The encoded protein is a component of a counterinflammatory pathway that attenuates obesity-induced adipose tissue inflammation and plays an adaptive role in maintaining metabolic homeostasis in obesity. [provided by RefSeq, Jul 2017]

OTOP1 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.08502078).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OTOP1	NM_177998.3 link	c.1400G>A	p.Cys467Tyr	missense_variant	Exon 5 of 6	ENST00000296358.5	NP_819056.1	Q7RTM1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OTOP1	ENST00000296358.5 link	c.1400G>A	p.Cys467Tyr	missense_variant	Exon 5 of 6	1	NM_177998.3	ENSP00000296358.4		Q7RTM1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.0000518

AC:

AN:

251178

Hom.:

AF XY:

0.0000663

AC XY:

AN XY:

135756

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000359

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000226

AC:

AN:

1461882

Hom.:

Cov.:

AF XY:

0.0000303

AC XY:

AN XY:

727240

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000301

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000540

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

ExAC

AF:

0.0000659

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 01, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1400G>A (p.C467Y) alteration is located in exon 5 (coding exon 5) of the OTOP1 gene. This alteration results from a G to A substitution at nucleotide position 1400, causing the cysteine (C) at amino acid position 467 to be replaced by a tyrosine (Y). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.48

BayesDel_noAF

Benign

-0.62

CADD

Benign

DANN

Benign

0.51

DEOGEN2

Benign

0.10

Eigen

Benign

-0.53

Eigen_PC

Benign

-0.43

FATHMM_MKL

Uncertain

0.86

LIST_S2

Benign

0.64

M_CAP

Benign

0.0035

MetaRNN

Benign

0.085

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.69

PrimateAI

Benign

0.44

PROVEAN

Benign

-1.8

REVEL

Benign

0.031

Sift

Benign

0.30

Sift4G

Benign

0.98

Polyphen

0.0020

Vest4

0.089

MutPred

0.61

Loss of glycosylation at T471 (P = 0.0774);

MVP

0.15

MPC

0.051

ClinPred

0.029

GERP RS

1.9

Varity_R

0.10

gMVP

0.51

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over