Gene Validity Curation

Gene Validity Classification Summary

Gene/Disease Pair:

CCDC50 : nonsyndromic genetic deafness

HGNC:18111 | MONDO_0019497
Mode of Inheritance: Autosomal dominant inheritance (HP:0000006)
Expert Panel: Hearing Loss
SOP: Gene Clinical Validity Standard Operating Procedures (SOP), Version 6

Genetic Evidence
Case-Level Data
Evidence Type Case Information Type Guidelines Points PMIDs/Notes
Default Range Max Count Total Counted
Variant Evidence
Autosomal Dominant or X-linked Disorder Variant is de novo 2 0-3 12
Proband with predicted or proven null variant 1.5 0-2 10 3 2 2
Modamio-Hoybjor S et al. 2007 Jun (PMID:17503326); Iwasa YI et al. 2016 Dec 2 (PMID:27911912); Sommen M et al. 2016 Aug (PMID:27068579);
Proband with other variant type with some evidence of gene impact 0.5 0-1.5 7
Autosomal Recessive Disease Two variants in trans and at least one de novo or a predicted/proven null variant 2 0-3 12
Two variants (not predicted/proven null) with some evidence of gene impact in trans 1 0-1.5
Segregation Evidence   Summed LOD Family Count 1 1  
Candidate gene sequencing 4.21 1
Modamio-Hoybjor S et al. 2007 Jun (PMID:17503326);
Exome/genome or all genes sequenced in linkage region
Total Summed LOD Score 4.21    
Case-Control Data
Case-Control Study Type Case-Control Quality Criteria Guidelines Points PMIDs/Notes
Points/Study Max Count Points Counted
Single Variant Analysis 1. Variant Detection Methodology
2. Power
3. Bias and confounding
4. Statistical Significance
0-6 12
Aggregate Variant Analysis 0-6
Total Genetic Evidence Points (Maximum 12) 3
Experimental Evidence
Evidence Category Evidence Type Guidelines Points PMIDs/Notes
Default Range Max Count Total Counted
Function Biochemical Function 0.5 0 - 2 2
0.5
Protein Interaction 0.5 0 - 2
Expression 0.5 0 - 2 1 0.5
Modamio-Hoybjor S et al. 2007 Jun (PMID:17503326);
Functional Alteration Patient cells 1 0 - 2 2
Non-patient cells 0.5 0 - 1
Models Non-human model organism 2 0 - 4 4
Cell culture model 1 0 - 2
Rescue Rescue in human 2 0 - 4
Rescue in non-human model organism 2 0 - 4
Rescue in cell culture model 1 0 - 2
Rescue in patient cells 1 0 - 2
Total Experimental Evidence Points (Maximum 6) 0.5

 


 

Assertion criteria Genetic Evidence (0-12 points) Experimental Evidence
(0-6 points)
Total Points
(0-18)
Replication Over Time (Y/N)
Description Case-level, family segregation, or case-control data that support the gene-disease association Gene-level experimental evidence that support the gene-disease association Sum of Genetic & Experimental
Evidence
> 2 pubs w/ convincing evidence over time (>3 yrs)
Assigned Points 3 0.5 3.5 NO
CALCULATED CLASSIFICATION LIMITED 1-6
MODERATE 7-11
STRONG 12-18
DEFINITIVE 12-18 AND replication over time
Valid contradictory evidence (Y/N)*
NO
CALCULATED CLASSIFICATION (DATE)
Limited
10/04/2018
EXPERT CURATION (DATE)
Limited
12/19/2017
EVIDENCE SUMMARY
The CCDC50​ gene has been associated with autosomal dominant nonsyndromic hearing loss​ using the ClinGen Clinical Validity Framework as of 12/​15/2017. This association was made using case-level data only. At least 3​ variants (nonsense, frameshift) have been reported in humans. CCDC50​ was first associated with this disease in humans as early as 2007​ (Modamio-Hoybjor et al.​). Association is seen in at least 3​ probands in 3​ publications (17503326, 27911912, 27068579). Variants in this gene segregated with disease in 14​ additional family members. This gene-disease association is supported by an expression study. In summary, there is limited evidence to support this gene-disease association. Although more evidence is needed to support a causal role, no convincing evidence has emerged that contradicts the gene-disease association. This classification was approved by the ClinGen Hearing Loss Working Group on 12/19/2017​.