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Position-effect Variegation02:32

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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Related Experiment Video

Updated: Mar 17, 2026

A Proboscis Extension Response Protocol for Investigating Behavioral Plasticity in Insects: Application to Basic, Biomedical, and Agricultural Research
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Epigenetic code and insect behavioural plasticity.

Ryszard Maleszka1

  • 1The Australian National University, Canberra, ACT 2601, Australia.

Current Opinion in Insect Science
|July 21, 2016
PubMed
Summary

Epigenetic mechanisms drive insect brain plasticity and adaptive behaviors. Future research should focus on cell-type specific epigenomics and how genetic variants influence methylation patterns for behavioral changes.

Area of Science:

  • Insect behavioral neuroscience
  • Epigenetics
  • Genomics

Background:

  • Adaptive behaviors in insects are influenced by genetic factors, but epigenetic mechanisms are increasingly recognized as key drivers of brain plasticity.
  • Epigenetic processes, including DNA methylation, histone modifications, and non-coding RNAs, are crucial for adapting to developmental and experiential changes.

Purpose of the Study:

  • To highlight the critical role of epigenetics in insect behavioral plasticity.
  • To emphasize the need for advanced, cell-type specific epigenomic analyses in insects.
  • To identify key research priorities for understanding epigenomic dynamics and their link to behavior.

Main Methods:

  • Review of recent advancements in methylomics, histone analysis, and non-coding RNA research in insects.

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  • Discussion of the limitations of current low-depth genome-wide analyses.
  • Emphasis on the necessity of cell-type specific epigenomic approaches.

    • Main Results:

    • Epigenetic mechanisms, constrained by genetics, are primary drivers of insect brain plasticity.
    • Advancements in 'omics' technologies enable more direct experimental investigation of insect epigenetics.
    • Sequence variants' impact on differential methylation patterns is a high-priority research area.

    Conclusions:

    • Insect epigenetics is poised for significant progress by focusing on mechanistic explanations of epigenomic dynamics.
    • Cell-type specific epigenomics is essential for a deeper understanding of behavioral plasticity.
    • Investigating the interplay between genetic variation, methylation, and behavior is crucial for future research.