rs727504841

Positions:

• chr10-71793487-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_022124.6(CDH23):​c.6559G>A​(p.Ala2187Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000479 in 1,461,680 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/17 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: 0.0000048 (0 hom.)
• Consequence: CDH23 NM_022124.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 3.76

Genes affected

CDH23 (HGNC:13733): (cadherin related 23) This gene is a member of the cadherin superfamily, whose genes encode calcium dependent cell-cell adhesion glycoproteins. The encoded protein is thought to be involved in stereocilia organization and hair bundle formation. The gene is located in a region containing the human deafness loci DFNB12 and USH1D. Usher syndrome 1D and nonsyndromic autosomal recessive deafness DFNB12 are caused by allelic mutations of this cadherin-like gene. Upregulation of this gene may also be associated with breast cancer. Alternative splice variants encoding different isoforms have been described. [provided by RefSeq, May 2013]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.09895107).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDH23	NM_022124.6	c.6559G>A	p.Ala2187Thr	missense_variant	48/70	ENST00000224721.12	NP_071407.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH23	ENST00000224721.12	c.6559G>A	p.Ala2187Thr	missense_variant	48/70	5	NM_022124.6	ENSP00000224721.9

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.0000321 AC: 8 AN: 249048 Hom.: 0 AF XY: 0.0000296 AC XY: 4 AN XY: 135158

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000232

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000479 AC: 7 AN: 1461680 Hom.: 0 Cov.: 31 AF XY: 0.00000550 AC XY: 4 AN XY: 727122

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000157

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

Bravo AF: 0.0000113

ExAC AF: 0.0000330 AC: 4

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jan 29, 2015

Variant classified as Uncertain Significance - Favor Benign. The p.Ala2187Thr va riant in CDH23 has been identified by our laboratory in one Latino individual wi th hearing loss. It has been also identified in 0.03% (4/11602) of Latino chromo somes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org) . Although the variant has been identified in the general population, its freque ncy is not high enough to rule out pathogenicity. The Alanine (Ala) residue at p osition 2187 is not conserved across species, with rat and many fish species hav ing a threonine (Thr) at this position. Additional computational prediction tool s suggest that the p.Ala2187Thr variant may not impact the protein, though this information is not predictive enough to rule out pathogenicity. In summary, the clinical significance of this variant cannot be determined with certainty; howev er based upon the conservation and computational data, we would lean towards a m ore likely benign role. -

Usher syndrome type 1 Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Oct 28, 2019

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 03, 2022

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 2187 of the CDH23 protein (p.Ala2187Thr). This variant is present in population databases (rs727504841, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with CDH23-related conditions. ClinVar contains an entry for this variant (Variation ID: 179395). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CDH23 protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.078
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.35
CADD	Benign	16
DANN	Benign	0.18
DEOGEN2	Benign	0.0069	T;T
Eigen	Benign	-0.50
Eigen_PC	Benign	-0.40
FATHMM_MKL	Benign	0.63	D
LIST_S2	Benign	0.80	T;T
M_CAP	Benign	0.0073	T
MetaRNN	Benign	0.099	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.43	.;N
PrimateAI	Benign	0.32	T
REVEL	Benign	0.079
Sift4G	Benign	0.38	T;.
Polyphen		0.0	.;B
Vest4		0.14
MutPred		0.50		Gain of catalytic residue at A2187 (P = 0.0858);Gain of catalytic residue at A2187 (P = 0.0858);
MVP		0.68
ClinPred		0.084	T
GERP RS		4.1
Varity_R		0.19
gMVP		0.37

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

Other links and lift over

dbSNP: rs727504841; hg19: chr10-73553244;