Gene Validity Curation

Gene Validity Classification Summary

Gene/Disease Pair:

BRAF : Noonan syndrome with multiple lentigines

HGNC:1097 | MONDO_0007893
Mode of Inheritance: Autosomal dominant inheritance (HP:0000006)
Expert Panel: RASopathy EP
SOP: Gene Clinical Validity Standard Operating Procedures (SOP), Version 5
Genetic Evidence
Case-Level Data
 Evidence Type Case Information Type Guidelines Points PMIDs/Notes
Default Range Max Total Counted
Variant Evidence
 Autosomal Dominant or X-linked Disorder Variant is de novo 2 0-3 12
4
4
Koudova M et al. 2009 Sep-Oct (PMID:19416762); Sarkozy A et al. 2009 Apr (PMID:19206169);
Proband with predicted or proven null variant 1.5 0-2 10
Proband with other variant type with some evidence of gene impact 0.5 0-1.5 7
1
1
Ezquieta B et al. 2012 May (PMID:22465605); Carcavilla A et al. 2013 May (PMID:24775816);
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 Evidence of segregation in one or more families   Sequencing Method 0-3 3
 
Total LOD Score Canditate Gene Sequencing Exome/Genome or all genes sequenced in linkage region  
2-2.99 0.5 1
3-4.99 1 2
≥5 1.5 3
Case-Control Data
 Case-Control Study Type Case-Control Quality Criteria Guidelines Points PMIDs/Notes
Points/Study Max Total 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) 5
Experimental Evidence
 Evidence Category Evidence Type Guidelines Points PMIDs/Notes
Default Range Max Total Counted
Function Biochemical Function 0.5 0 - 2 2
0.5
Protein Interaction 0.5 0 - 2 0.5
Rauen KA et al. 2013 July 15 (PMID:23875798);
Expression 0.5 0 - 2
Functional Alteration Patient cells 1 0 - 2 2
0
Non-patient cells 0.5 0 - 1 0
Sarkozy A et al. 2009 Apr (PMID:19206169);
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 5 0.5 5.5 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
07/24/2018
EXPERT CURATION (DATE)
Limited
07/24/2018
EVIDENCE SUMMARY
There was only sufficient evidence in the literature for the BRAF:NSML association to be classified as Limited. Variable expressivity, age of ascertainment, and outdated clinical assessments of affected individuals may complicate the clinical diagnosis of NSML versus other BRAF-RASopathies. Additional phenotype:genotype correlations are necessary to solidify the association of BRAF with NSML. Of note, variants identified in patients with CFC syndrome diagnoses have been identified in patients with Noonan syndrome, thus complicating the possibility of a genotype:phenotype correlation(Carcavilla et al., 2013; Ezquieta et al., 2012; Koudova, Seemanova, & Zenker, 2009; Sarkozy et al., 2009). The BRAF gene is also located in the Ras/MAPK pathway which is directly associated with the NSML phenotype (Aoki et al., 2016; Rauen, 2013).