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| Intellectual disability - microarray and sequencing v3.1561 | FBXO28 |
Konstantinos Varvagiannis gene: FBXO28 was added gene: FBXO28 was added to Intellectual disability. Sources: Literature Mode of inheritance for gene: FBXO28 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: FBXO28 were set to 30160831; 33280099 Phenotypes for gene: FBXO28 were set to Developmental and epileptic encephalopathy 100 (# 619777) Penetrance for gene: FBXO28 were set to unknown Review for gene: FBXO28 was set to GREEN Added comment: Heterozygous pathogenic FBXO28 variants cause Developmental and epileptic encephalopathy 100 (# 619777). At least 10 individuals with monoallelic missense / truncating FBXO28 variants have been reported. The subject with de novo frameshift variant initially reported by Balak et al (2018 - PMID:30160831) was included with additional clinical details in a recent report along with 9 further individuals (Schneider et al, 2021 - PMID: 33280099). The phenotype corresponds to a developmental and epileptic encephalopathy with severe/profound ID. As discussed by Schneider et al, all individuals had DD prior to seizure onset which occurred at a median age of 22.5 months (range: 8m - 5y). The authors noted that missense variants may be associated with a milder phenotype (e.g. seizures occurred at the age of 4-5 years in 3 individuals). Given these, FBXO28 appears to be relevant for inclusion in the current panel, with investigations prior to seizure onset. As in the summary by Schneider et al, the gene encodes F-box only protein 28, a ubiquitin ligase promoting ubiquitination and degradation of phosphorylated proteins. While FBXO28 has been suggested to have a critical role in 1q41q42 deletions (most spanning also WDR26) the authors note that a mechanism different than haploinsufficiency may underly FBXO28 encephalopathy. Importantly, all 5 truncating variants reported (and 2/4 missense ones) occurred in the last exon, making these variants less susceptible to NMD. 2 other (of the 4) missense variants clustered in the F-box domain, which the authors hypothesize may correspond to a second pathogenic region. 7/9 variants arose de novo while 2 individuals had inherited a missense and a stopgain variant from mosaic unaffected parents (2.5% and 6%). A comparison of the FBXO28-associated phenotype with the respective of 1q41q42 deletions and WDR26-related NDD is also made. Consider inclusion in the ID panel with green (or amber) rating. Please consider inclusion in other possibly relevant panels (e.g. microcephaly (4/10), movement disorders, etc). Sources: Literature |
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| Intellectual disability - microarray and sequencing v2.468 | WDR26 | Louise Daugherty Source Victorian Clinical Genetics Services was added to WDR26. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | WDR26 | Louise Daugherty classified WDR26 as Green List (high evidence) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Intellectual disability - microarray and sequencing | WDR26 | Zornitza Stark Added gene to panel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||