Sarah Leigh Added comment: Comment on mode of pathogenicity: Personal communication from Dmitrijs Rots (RadboudUMC). Prompted by the occurrence of a KIDINS220 nonsense variant in the middle of the gene, in a family without spastic paraplegia (HSP) or other features; an in-depth analysis of KIDINS220 variants was performed. It would appear that KIDINS220 gene is tolerant of LOF variants (nonsense, frameshift) in gnomAD population (hence pLI~ 0, in the PanelApp review by Dmitrijs Rots (RadboudUMC), 4 Nov 2021). This was unexpected, as KIDINS220-associated-HSP presents in childhood, so it would appear that haploinsufficiency is unlikely as the mechanism. In addition, there were nonsense/frameshift HSP-associated variants in KIDINS220, but they were located in the last two exons of the gene and so likely to escape nonsense mediated decay. Therefore, it is proposed that rather a LOF mechanism a dominant negative effect may be responsible, however, further cases need to be identified to confirm this.
Sarah Leigh Phenotypes for gene: KIDINS220 were changed from Spastic paraplegia, intellectual disability, nystagmus, and obesity 617296 to Spastic paraplegia, intellectual disability, nystagmus, and obesity OMIM:617296