rs876657680

Variant names:

• chr10-71646618-G-T
• rs876657680
• NM_022124.6:c.1449+1G>T

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PVS1_Moderate PM2 PP5_Moderate

The NM_022124.6(CDH23):​c.1449+1G>T variant causes a splice donor, intron change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CDH23 NM_022124.6 splice_donor, intron
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.96

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_pathogenic. Variant got 6 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.015797317 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 10-71646618-G-T is Pathogenic according to our data. Variant chr10-71646618-G-T is described in ClinVar as [Pathogenic]. Clinvar id is 228327.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDH23	NM_022124.6	c.1449+1G>T		splice_donor_variant, intron_variant	Intron 14 of 69	ENST00000224721.12	NP_071407.4
CDH23	NM_052836.4	c.1450G>T	p.Val484Leu	missense_variant	Exon 14 of 14		NP_443068.1
CDH23	NM_001171930.2	c.1449+1G>T		splice_donor_variant, intron_variant	Intron 14 of 31		NP_001165401.1
CDH23	NM_001171931.2	c.1449+1G>T		splice_donor_variant, intron_variant	Intron 14 of 25		NP_001165402.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDH23	ENST00000224721.12	c.1449+1G>T		splice_donor_variant, intron_variant	Intron 14 of 69	5	NM_022124.6	ENSP00000224721.9

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Rare genetic deafness Pathogenic:1

Jan 28, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1449+1G>T variant in CDH23 has not been previously identified in individua ls with hearing loss or Usher syndrome and is absent from large population studi es. This variant occurs in the invariant region (+/- 1,2) of the splice consens us sequence and is predicted to cause altered splicing leading to an abnormal or absent protein. Loss of function of the CDH23 gene is an established disease m echanism in autosomal recessive Usher syndrome type 1. In summary, this variant meets our criteria to be classified as pathogenic for Usher syndrome in an autos omal recessive manner based on the predicted impact of the variant. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Benign	-0.14
CADD	Pathogenic	36
DANN	Uncertain	1.0
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Pathogenic	0.99	D
M_CAP	Uncertain	0.11	D
ClinPred		0.99	D
GERP RS		5.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		1.0		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.85		Position offset: 50
DS_DL_spliceai		1.0		Position offset: -1

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs876657680; hg19: chr10-73406375;