Inherited bleeding disordersGene: IKZF5
Comment on list classification: New gene added. Appropriate phenotype, sufficient cases and external expert review (pers.comm) all support gene-disease association and relevance to this panel to rate gene to Green.
Created: 9 Aug 2019, 1:55 p.m. | Last Modified: 9 Aug 2019, 1:55 p.m.
Panel Version: 1.156
From abstract Lentaigne C et al (2019) PMID: 31217188: To identify novel causes of hereditary thrombocytopenia, we performed a genetic association analysis of whole-genome sequencing (WGS) data from 13,037 individuals enrolled in the NIHR BioResource, including 233 cases with isolated thrombocytopenia. We found an association between rare variants in the transcription factor (TF)-encoding gene IKZF5 and thrombocytopenia. We report five causal missense variants in or near IKZF5 zinc fingers (Znfs), of which two occurred de novo and three co-segregated in three pedigrees. A canonical DNA-Znf binding model predicts that three of the variants alter DNA recognition. Expression studies showed that chromatin binding was disrupted in mutant compared to wild-type (WT) IKZF5 and electron microscopy (EM) revealed a reduced quantity of alpha granules in normally sized platelets. Proplatelet formation (PPF) was reduced in megakaryocytes (MKs) from seven cases relative to six controls. Comparison of RNA-seq data from platelets, monocytes, neutrophils and CD4+ T-cells from three cases and 14 healthy controls showed 1,194 differentially expressed genes (DEGs) in platelets but only four DEGs in each of the other blood cell types. In conclusion, IKZF5 is a novel transcriptional regulator of megakaryopoiesis and the eighth transcription factor associated with dominant thrombocytopenia in humans.
Created: 9 Aug 2019, 1:52 p.m.
Mode of inheritance
MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Gene: ikzf5 has been classified as Green List (High Evidence).
gene: IKZF5 was added gene: IKZF5 was added to Inherited bleeding disorders. Sources: Literature Mode of inheritance for gene: IKZF5 was set to MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown Publications for gene: IKZF5 were set to 31217188 Phenotypes for gene: IKZF5 were set to Thrombocytopenia Review for gene: IKZF5 was set to GREEN