Laboratory for Structure and Function of Heterochromatin
Our research is focused on satellite DNAs and other repetitive DNA sequences with the goal to understand their structure, evolutionary mechanisms, functionality and impact on genome dynamics and plasticity.
- Studies of sequence traits and evolution of satellite DNAs in closely related species of three distant invertebrate groups with different modes of reproduction and different centromeric organization
- Mapping and analyses of satellite DNA arrays at monocentric and holocentric chromosomes
- Study of organizational and mutational properties of satellite repeats at array borders and characterization of junction regions between families of repetitive sequences
- Satellite DNA-protein interactions in heterochromatin. Analysis of possible phasing of satellite monomers on nucleosomes as well as analysis of DNA-protein associations in centromere-specific nucleosomes
- Cytogenetics on monocentric/holocentric chromosomes
The main objective of the lab’s research is to understand origins and consequences of diversity of satellite DNAs, features, constraints imposed on and functional interactions in which satellite DNAs may contribute. Our interest is focused on satellite repeats in general, and in particular, on the structure and organization of repeats in centromeric as well as in telomeric areas.
In our research we use species from three distant groups of invertebrates. Selected model organisms have different modes of reproduction (sexual and parthenogenetic) and different organization of centromeres: the widespread satellite-rich regional centromeres (Insecta, Tenebrionidae), holocentric centromeres (Nematoda, Meloidogyne) and satellite-poor centromeres (Mollusca).
The approach based on comparative studies of satellite DNA/nucleosomal structure in species with different modes of reproduction and different centromeric organization offers information necessary to conclude about general principles of satellite DNA evolution and putative functional interactions in centromeres and in surrounding heterochromatin in general. Obtaining a more complete picture of heterochromatin serves as a crucial platform for unraveling organizational principles, function and evolution of eukaryotic genomes.
Mravinac B., Meštrović, N., Čavrak, V., Plohl, M. (2011) TCAGG, an alternative telomeric sequence in insects. Chromosoma, 120, 367-376
Mravinac, B., Plohl, M. (2010) Parallelism in evolution of highly repetitive DNAs in sibling species. Mol. Biol. Evol., 27, 1857-1867
Plohl, M., Petrović, V., Luchetti, A., Ricci, A., Šatović, E., Passamonti, M., Mantovani, B. (2010) Long-term conservation vs. high sequence divergence: the case of an extraordinarily old satellite DNA in bivalve mollusks. Heredity 104, 543-551
Meštrović, N., Plohl, M., Castagnone-Sereno, P. (2009) Relevance of satellite DNA genomic distribution in phylogenetic analysis: a case study with root-knot nematodes of the genus Meloidogyne. Mol. Phyl. Evol. 50, 204-208
Plohl, M., Luchetti, A., Meštrović, N., Mantovani, B. (2008) Satellite DNAs between selfishness and functionality: structure, genomics and evolution of tandem repeats in centromeric heterochromatin. Gene 409, 72-82
Meštrović, N., Castagnone-Sereno, P., Plohl, M. (2006) Interplay of selective pressure and stochastic events directs evolution of the MEL 172 satellite DNA library in root-knot nematodes. Mol. Biol. Evol. 23, 2316-2325
Meštrović, N., Plohl, M., Mravinac, B. and Ugarković, Đ. (1998) Evolution of satellite DNAs from the genus Palorus - experimental evidence for the "library" hypothesis. Mol. Biol. Evol. 15, 1062-1068
The main goal of this project is to identify CenH3 and CenH3-associated DNA sequences as well as their non-functional counterparts in order to explore genomics of differently organized centromeres: satellite DNA-rich, satellite DNA-poor and dispersed on holocentric chromosomes.more »