rs876657680

chr10-71646618-G-T

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1_Moderate PM2 PP3_Strong PP5_Moderate

The NM_022124.6(CDH23):c.1449+1G>T variant causes a splice donor 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. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CDH23 NM_022124.6 splice_donor
• 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 Pathogenic. Variant got 10 ACMG points.

• PVS1: Splicing variant, NOT destroyed by nmd, known LOF gene, truncates exone, which is 0.015697964 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
• PM2: Very rare variant in population databases, with high coverage
• PP3: BayesDel_addAF computational evidence supports a deleterious effect, 0.438
• 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/exons	MANE	UniProt
CDH23	NM_022124.6	c.1449+1G>T		splice_donor_variant		ENST00000224721.12
CDH23	NM_001171930.2	c.1449+1G>T		splice_donor_variant
CDH23	NM_001171931.2	c.1449+1G>T		splice_donor_variant
CDH23	NM_052836.4	c.1450G>T	p.Val484Leu	missense_variant	14/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDH23	ENST00000224721.12	c.1449+1G>T		splice_donor_variant		5	NM_022124.6	P1

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

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Jan 28, 2016

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
MutationTaster	Benign	1.0	D;D;N;N
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;