Phenotypic Plasticity in Lepidopteran Development

Phenotypic plasticity in Lepidoptera encompasses the ability of a single genotype to produce multiple morphological, physiological and behavioural phenotypes in response to environmental cues. Such plastic responses enable caterpillars and butterflies to adjust development to seasonal changes in temperature, photoperiod and nutrient availability, delivering adaptive strategies including crypsis, thermal tolerance and diapause. Mechanistically, these responses are mediated by endocrine signals such as ecdysteroids, shifts in gene expression profiles and post-transcriptional modifications, which together define discrete reaction norms. Among Lepidoptera, seasonal polyphenisms—where alternative adult forms arise from distinct developmental pathways—have become key models for dissecting the evolution of plastic traits. This breadth of plastic potential is vital for resilience to climate variability and informs conservation of pollinators and pest management. Contemporary research highlights both the profound ecological significance of plasticity in population dynamics and the molecular constraints that shape its evolutionary trajectory.

Research from Nature Portfolio

Recent studies have revealed that extensive morphological plasticity can paradoxically restrict evolutionary adaptation to rapid environmental change. Analyses of seasonally distinct butterfly forms demonstrated pervasive gene expression differences yet identified minimal intra-population variation in plasticity itself, suggesting that dependable environmental cues have driven specialisation of reaction norms and depleted genetic diversity for responsiveness. Complementing this, transcriptomic investigations have distinguished differential expression from alternative splicing as discrete axes of transcriptional plasticity. Although splicing influences a unique subset of genes critical to seasonal transitions, it appears particularly vulnerable to erosion of genetic variation under selection, indicating that post-transcriptional mechanisms may impose key constraints on the evolutionary flexibility of plastic traits.

Research from all publishers

A comprehensive review has underscored the ubiquity of developmental plasticity across insect taxa, advocating for comparative evo-devo frameworks to unravel conserved and lineage-specific mechanisms. The authors emphasise that while general pathways, such as hormone-triggered transcriptional cascades, are widely shared, contextual environmental signals lead to diverse phenotypic outcomes. In a study of the butterfly Pieris napi, researchers characterised how alternative splicing and gene expression differ between diapausing and directly developing pupae. They demonstrated that splicing variation affects a smaller, functionally distinct gene set which experiences stronger purifying selection, highlighting genetic constraints on plastic diapause pathways. Additionally, a transcriptomic atlas of Bicyclus anynana hindwing tissues has mapped dynamic changes in gene expression, miRNA regulation and splicing across seasonal forms, revealing that developmental transitions linked to hormonal pulses have a greater impact on molecular patterns than rearing temperature alone.

Phenotypic Plasticity in Lepidopteran Development publication trend

The graph below shows the total number of articles in phenotypic plasticity in lepidopteran development across all publications each year (not limited to Nature Index journals).

Technical terms

Reaction norm: The range of phenotypes produced by a genotype across environmental conditions.

Polyphenism: A form of plasticity where two or more discrete phenotypes arise from the same genotype.

Diapause: A hormonally regulated state of arrested development enabling survival during adverse conditions.

Ecdysteroid: A class of insect steroid hormones that regulate molting and metamorphosis.

Alternative splicing: Post-transcriptional processing that generates different mRNA variants from a single gene.

Transcriptomics: The global study of RNA transcripts to assess gene expression and regulatory dynamics.

References

1. One genome, multiple phenotypes: decoding the evolution and mechanisms of environmentally induced developmental plasticity in insects. Biochemical Society Transactions (2023).
2. Genetic constraints in genes exhibiting splicing plasticity in facultative diapause. Heredity (2024).
3. Strong phenotypic plasticity limits potential for evolutionary responses to climate change. Nature Communications (2018).
4. A Transcriptomic Atlas Underlying Developmental Plasticity of Seasonal Forms of Bicyclus anynana Butterflies. Molecular Biology and Evolution (2022).
5. Alternative splicing in seasonal plasticity and the potential for adaptation to environmental change. Nature Communications (2022).