2-240140086-C-G

Position:

• chr2-240140086-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_148961.4(OTOS):​c.61G>C​(p.Ala21Pro) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: OTOS NM_148961.4 missense, splice_region
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.78

Genes affected

OTOS (HGNC:22644): (otospiralin) Otospiralin is synthesized by nonsensory cells (fibrocytes) of the inner ear, and downregulation of otospiralin in guinea pigs leads to deafness (Lavigne-Rebillard et al., 2003 [PubMed 12687421]).[supplied by OMIM, Mar 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OTOS	NM_148961.4	c.61G>C	p.Ala21Pro	missense_variant, splice_region_variant	3/4	ENST00000319460.2
OTOS	XM_017003409.2	c.118G>C	p.Ala40Pro	missense_variant, splice_region_variant	3/4
OTOS	XM_017003410.2	c.61G>C	p.Ala21Pro	missense_variant, splice_region_variant	3/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OTOS	ENST00000319460.2	c.61G>C	p.Ala21Pro	missense_variant, splice_region_variant	3/4	5	NM_148961.4	P1
OTOS	ENST00000391989.6	c.61G>C	p.Ala21Pro	missense_variant, splice_region_variant	4/5	3		P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 27, 2023

The c.61G>C (p.A21P) alteration is located in exon 3 (coding exon 2) of the OTOS gene. This alteration results from a G to C substitution at nucleotide position 61, causing the alanine (A) at amino acid position 21 to be replaced by a proline (P). 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	0.19
BayesDel_addAF	Benign	-0.064	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.57	D;D
Eigen	Uncertain	0.54
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Benign	0.59	.;T
M_CAP	Uncertain	0.097	D
MetaRNN	Uncertain	0.67	D;D
MetaSVM	Benign	-0.69	T
MutationTaster	Benign	0.98	D;D
PrimateAI	Uncertain	0.56	T
PROVEAN	Pathogenic	-4.5	D;D
REVEL	Uncertain	0.32
Sift	Uncertain	0.028	D;D
Sift4G	Uncertain	0.0080	D;D
Polyphen		1.0	D;D
Vest4		0.57
MutPred		0.54		Gain of disorder (P = 0.0405);Gain of disorder (P = 0.0405);
MVP		0.68
MPC		0.28
ClinPred		0.99	D
GERP RS		2.5
Varity_R		0.70
gMVP		0.77

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-241079503;