Cytogenetic Analysis and Chromosomal Evolution in Hymenoptera
Summary
The cytogenetic analysis of Hymenoptera has revealed extraordinary diversity in chromosome number, structure and organisation across ants, bees and parasitoid wasps. Mechanistic processes such as centric fissions and fusions, pericentric inversions and the spread of heterochromatin drive karyotype evolution, often correlating with speciation, social complexity and ecological adaptation. This field has been propelled by a suite of techniques – from classical Giemsa staining and C-banding to fluorescence in situ hybridisation and chromosomal microdissection – enabling precise mapping of nucleolus organising regions, telomeric repeats and repetitive DNAs. Comparative frameworks integrating cytogenetics with molecular phylogenies have reconstructed ancestral chromosome numbers for key taxa, challenged long-standing theories of chromosomal change, and clarified taxonomic relationships among cryptic species. These insights inform our understanding of genomic architecture, underpin conservation strategies, and hold potential for targeted management of pest and pollinator species.
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Cytogenetic Analysis and Chromosomal Evolution in Hymenoptera publication trend
The graph below shows the total number of articles in cytogenetic analysis and chromosomal evolution in hymenoptera across all publications each year (not limited to Nature Index journals).
Technical terms
Karyotype: The full set of chromosomes in a cell, characterised by number, size and shape.
Haploid number (n): The number of chromosomes in a gamete, representing a single set.
Robertsonian rearrangement: A chromosomal change in which two acrocentric chromosomes fuse at the centromere (fusion) or a metacentric chromosome splits into two (fission).
Fluorescence in situ hybridisation (FISH): A technique that uses fluorescent probes to locate specific DNA sequences on chromosomes.
Heterochromatin: Compact, transcriptionally inactive chromatin often found near centromeres or telomeres.
B chromosome: Additional, non-essential chromosomes that vary in number among individuals of a species.
References
- Comparative Karyotype Analysis of Parasitoid Hymenoptera (Insecta): Major Approaches, Techniques, and Results. Genes (2022).
- The evolution of haploid chromosome numbers in Meliponini. PLOS ONE (2019).
- The Role of Fusion in Ant Chromosome Evolution: Insights from Cytogenetic Analysis Using a Molecular Phylogenetic Approach in the Genus Mycetophylax. PLOS ONE (2014).
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