Related Experiment Video
Updated: Aug 29, 2025
In vitro tRNA Methylation Assay with the Entamoeba histolytica DNA and tRNA Methyltransferase Dnmt2 Ehmeth Enzyme
Published on: October 19, 2010
Putative SET-domain methyltransferases in Cryptosporidium parvum and histone methylation during infection
Manasi Sawant1, Sadia Benamrouz-Vanneste1,2, Dionigia Meloni1
1Université de Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019 - UMR 9017 - CIIL - Centre d'Infection et d'Immunité de Lille, Lille, France.
Abstract:
Cryptosporidium parvum is a leading cause of diarrhoeal illness worldwide being a significant threat to young children and immunocompromised patients, but the pathogenesis caused by this parasite remains poorly understood. C. parvum was recently linked with oncogenesis. Notably, the mechanisms of gene expression regulation are unexplored in Cryptosporidium and little is known about how the parasite impact host genome regulation. Here, we investigated potential histone lysine methylation, a dynamic epigenetic modification, during the life cycle of the parasite. We identified SET-domain containing proteins, putative lysine methyltransferases (KMTs), in the C. parvum genome and classified them phylogenetically into distinct subfamilies (namely CpSET1, CpSET2, CpSET8, CpKMTox and CpAKMT). Our structural analysis further characterized CpSET1, CpSET2 and CpSET8 as histone lysine methyltransferases (HKMTs). The expression of the CpSET genes varies considerably during the parasite life cycle and specific methyl-lysine antibodies showed dynamic changes in parasite histone methylation during development (CpSET1:H3K4; CpSET2:H3K36; CpSET8:H4K20). We investigated the impact of C. parvum infection on the host histone lysine methylation. Remarkably, parasite infection led to a considerable decrease in host H3K36me3 and H3K27me3 levels, highlighting the potential of the parasite to exploit the host epigenetic regulation to its advantage. This is the first study to describe epigenetic mechanisms occurring throughout the parasite life cycle and during the host-parasite interaction. A better understanding of histone methylation in both parasite and host genomes may highlight novel infection control strategies.
Insights
This study reveals that Cryptosporidium parvum alters host epigenetic regulation by decreasing histone methylation. Understanding these epigenetic changes in the parasite and host may lead to new infection control strategies.
Area of Science:
- Epigenetics
- Parasitology
- Molecular Biology
Background:
- Cryptosporidium parvum causes widespread diarrheal illness, particularly in vulnerable populations.
- The parasite's pathogenic mechanisms and impact on host gene expression remain poorly understood.
- Recent links between C. parvum and oncogenesis highlight the need to investigate its effects on host genome regulation.
Purpose of the Study:
- To investigate histone lysine methylation during the C. parvum life cycle.
- To identify and characterize lysine methyltransferases (KMTs) in C. parvum.
- To examine the impact of C. parvum infection on host histone lysine methylation patterns.
Main Methods:
- Phylogenetic and structural analysis of SET-domain containing proteins in C. parvum.
- Analysis of CpSET gene expression throughout the parasite life cycle.
- Detection of specific histone lysine methylation marks using methyl-lysine antibodies.
- Assessment of host histone methylation levels (H3K36me3, H3K27me3) following C. parvum infection.
Main Results:
- Identification and classification of C. parvum KMTs into distinct subfamilies (CpSET1, CpSET2, CpSET8, CpKMTox, CpAKMT).
- Characterization of CpSET1, CpSET2, and CpSET8 as histone lysine methyltransferases (HKMTs).
- Dynamic changes in parasite histone methylation (H3K4me, H3K36me, H4K20me) observed during the parasite life cycle.
- Significant decrease in host H3K36me3 and H3K27me3 levels upon C. parvum infection.
Conclusions:
- This study provides the first description of epigenetic mechanisms in C. parvum throughout its life cycle and during host-parasite interaction.
- C. parvum possesses functional HKMTs involved in dynamic histone methylation.
- The parasite actively manipulates host epigenetic regulation, evidenced by reduced host H3K36me3 and H3K27me3.
- Understanding these epigenetic interactions may reveal novel strategies for controlling Cryptosporidium infections.
More Related Videos
09:25Genome-wide Analysis of Histone Modifications Distribution using the Chromatin Immunoprecipitation Sequencing Method in Magnaporthe oryzae
Published on: June 2, 2021
05:31Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
Published on: September 14, 2019
Related Concept Videos
02:25Spreading of Chromatin Modifications
Writers
The writer...
01:28Fungal Phylum Microsporidia
02:32Histone Modification
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
03:17Inheritance of Chromatin Structures
01:46Epigenetic Regulation