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Altering a Histone H3K4 Methylation Pathway in Glomerular Podocytes Promotes a Chronic Disease Phenotype
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Altering a Histone H3K4 Methylation Pathway in Glomerular Podocytes Promotes a Chronic Disease Phenotype
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Journal Article
Altering a Histone H3K4 Methylation Pathway in Glomerular Podocytes Promotes a Chronic Disease Phenotype
2010
Overview
Methylation of specific lysine residues in core histone proteins is essential for embryonic development and can impart active and inactive epigenetic marks on chromatin domains. The ubiquitous nuclear protein PTIP is encoded by the Paxip1 gene and is an essential component of a histone H3 lysine 4 (H3K4) methyltransferase complex conserved in metazoans. In order to determine if PTIP and its associated complexes are necessary for maintaining stable gene expression patterns in a terminally differentiated, non-dividing cell, we conditionally deleted PTIP in glomerular podocytes in mice. Renal development and function were not impaired in young mice. However, older animals progressively exhibited proteinuria and podocyte ultra structural defects similar to chronic glomerular disease. Loss of PTIP resulted in subtle changes in gene expression patterns prior to the onset of a renal disease phenotype. Chromatin immunoprecipitation showed a loss of PTIP binding and lower H3K4 methylation at the Ntrk3 (neurotrophic tyrosine kinase receptor, type 3) locus, whose expression was significantly reduced and whose function may be essential for podocyte foot process patterning. These data demonstrate that alterations or mutations in an epigenetic regulatory pathway can alter the phenotypes of differentiated cells and lead to a chronic disease state.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Carrier Proteins - metabolism
/ Female
/ Genetics
/ Genetics and Genomics/Disease Models
/ Genetics and Genomics/Epigenetics
/ Genetics and Genomics/Genetics of Disease
/ Kidney Diseases - metabolism
/ Kidney Glomerulus - cytology
/ Kidney Glomerulus - metabolism
/ Male
/ Metazoa
/ Mice
/ Microscopy, Electron, Scanning
/ Microscopy, Electron, Transmission
/ Mutation
/ Nephrology/Chronic Kidney Disease
/ Nuclear Proteins - metabolism
/ Oligonucleotide Array Sequence Analysis
/ Proteins
