Conserved histone methyltransferases of the DOT1 family are involved in replication regulation, cell cycle progression, stage differentiation, and gene regulation in trypanosomatids. However, the specific functions of these enzymes depend on the host evasion strategies of the parasites. In this study, we investigated the role of DOT1B in Leishmania mexicana, focusing on life cycle progression and infectivity. In contrast to Trypanosoma brucei, in which DOT1B is essential for the differentiation of mammal-infective bloodstream forms to insect procyclic forms, L. mexicana DOT1B (LmxDOT1B) is not critical for the differentiation of promastigotes to amastigotes in vitro. Additionally, there are no significant differences in the ability to infect or differentiate in macrophages or sand fly vectors between the LmxDOT1B-depleted and control strains. These findings highlight the divergence of the function of DOT1B in these related parasites, suggesting genus-specific adaptations in the use of histone modifications for life cycle progression and host adaptation processes.

• Klíčová slova
• DOT1, Leishmania mexicana, differentiation, histone methyltransferase, sand fly, virulence,
• MeSH
• buněčná diferenciace MeSH
• histonlysin-N-methyltransferasa * metabolismus   genetika   MeSH
• histonové methyltransferasy metabolismus   genetika   MeSH
• Leishmania mexicana * genetika   enzymologie   růst a vývoj   MeSH
• makrofágy * parazitologie   MeSH
• myši MeSH
• protozoální proteiny metabolismus   genetika   MeSH
• Psychodidae parazitologie   MeSH
• stadia vývoje * MeSH
• zvířata MeSH
• Check Tag
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• histonlysin-N-methyltransferasa * MeSH
• histonové methyltransferasy MeSH
• protozoální proteiny MeSH

One of the remarkable features of eukaryotes is the nucleus, delimited by the nuclear envelope (NE), a complex structure and home to the nuclear lamina and nuclear pore complex (NPC). For decades, these structures were believed to be mainly architectural elements and, in the case of the NPC, simply facilitating nucleocytoplasmic trafficking. More recently, the critical roles of the lamina, NPC and other NE constituents in genome organisation, maintaining chromosomal domains and regulating gene expression have been recognised. Importantly, mutations in genes encoding lamina and NPC components lead to pathogenesis in humans, while pathogenic protozoa disrupt the progression of normal development and expression of pathogenesis-related genes. Here, we review features of the lamina and NPC across eukaryotes and discuss how these elements are structured in trypanosomes, protozoa of high medical and veterinary importance, highlighting lineage-specific and conserved aspects of nuclear organisation.

• Klíčová slova
• evolutionary diversity, nuclear lamina, nuclear pore complex, nucleus, trypanosoma,
• MeSH
• aktivní transport - buněčné jádro fyziologie   MeSH
• jaderný obal MeSH
• jaderný pór genetika   metabolismus   MeSH
• komplex proteinů jaderného póru * metabolismus   MeSH
• lidé MeSH
• Trypanosoma * genetika   metabolismus   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH
• Názvy látek
• komplex proteinů jaderného póru * MeSH

Eukaryotic cells arose ~1.5 billion years ago, with the endomembrane system a central feature, facilitating evolution of intracellular compartments. Endomembranes include the nuclear envelope (NE) dividing the cytoplasm and nucleoplasm. The NE possesses universal features: a double lipid bilayer membrane, nuclear pore complexes (NPCs), and continuity with the endoplasmic reticulum, indicating common evolutionary origin. However, levels of specialization between lineages remains unclear, despite distinct mechanisms underpinning various nuclear activities. Several distinct modes of molecular evolution facilitate organellar diversification and to understand which apply to the NE, we exploited proteomic datasets of purified nuclear envelopes from model systems for comparative analysis. We find enrichment of core nuclear functions amongst the widely conserved proteins to be less numerous than lineage-specific cohorts, but enriched in core nuclear functions. This, together with consideration of additional evidence, suggests that, despite a common origin, the NE has evolved as a highly diverse organelle with significant lineage-specific functionality.

• Klíčová slova
• Nuclear envelope, eukaryogenesis, evolution, heterochromatin, lamina, proteome,
• MeSH
• buněčné jádro genetika   MeSH
• endoplazmatické retikulum MeSH
• jaderný obal * MeSH
• jaderný pór genetika   MeSH
• proteomika * MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH