NM_022124.6:c.8120_8121delCGinsTT

Variant names:

• chr10-71806223-CG-TT
• rs876657422
• NM_022124.6:c.8120_8121delCGinsTT

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 3P and 8B. PM1 PP3 BP6_Very_Strong

The NM_022124.6(CDH23):​c.8120_8121delCGinsTT​(p.Pro2707Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. The variant is present in control chromosomes in GnomAd MNV project. The variant allele was found at a frequency of 0.00109 in 246 alleles, including 4 homozygotes. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely benign (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P2707S) has been classified as Uncertain significance.

• Frequency: GnomAD MNV: 𝑓 0.0011 Genomes: not found (cov: 31)
• Consequence: CDH23 NM_022124.6 missense
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5
• Conservation: PhyloP100: 7.87
• Publications: 0 publications found

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]

CDH23 Gene-Disease associations (from GenCC):

• autosomal recessive nonsyndromic hearing loss 12

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, PanelApp Australia
• nonsyndromic genetic hearing loss

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• Usher syndrome type 1

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Usher syndrome type 1D

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae), PanelApp Australia
• hearing loss, autosomal recessive

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_022124.6
• PP3: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP
• BP6: Variant 10-71806223-CG-TT is Benign according to our data. Variant chr10-71806223-CG-TT is described in ClinVar as Benign/Likely_benign. ClinVar VariationId is 226499.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDH23	NM_022124.6	c.8120_8121delCGinsTT	p.Pro2707Leu	missense_variant		ENST00000224721.12	NP_071407.4
CDH23	NM_001171933.1	c.1400_1401delCGinsTT	p.Pro467Leu	missense_variant			NP_001165404.1
CDH23	NM_001171934.1	c.1400_1401delCGinsTT	p.Pro467Leu	missense_variant			NP_001165405.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDH23	ENST00000224721.12	c.8120_8121delCGinsTT	p.Pro2707Leu	missense_variant		5	NM_022124.6	ENSP00000224721.9

Frequencies

GnomAD3 genomes Cov.: 31

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 31

GnomAD MNV AF: 0.00109 AC: 246 Hom.: 4

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:2

Nov 04, 2016

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 03, 2016

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

c.8120_8121delinsTT (p.Pro2707Leu) in exon 57 of CDH23: This variant is not exp ected to have clinical significance because it has been identified in 1% (86/832 4) of South Asian chromosomes by the Exome Aggregation Consortium (ExAC, http:// exac.broadinstitute.org; dbSNP rs377535432 and rs373230009). -

not provided Benign:2

Jan 15, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 15, 2019

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Autosomal recessive nonsyndromic hearing loss 12;C1832845:Usher syndrome type 1D;C4539685:Pituitary adenoma 5, multiple types Benign:1

Jul 28, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.9
Mutation Taster		=28/72	disease causing

Splicing

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

Other links and lift over

dbSNP: rs876657422; hg19: chr10-73565980;