From soap bubbles to multicellular organisms: Unraveling the role of cell adhesion and physical constraints in tile pattern formation and tissue morphogenesis

Togashi, Hideru; Davis, Steven Ray; Sato, Makoto

doi:10.1016/j.ydbio.2023.11.007

Cited by 1 publication

(1 citation statement)

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“…In situ expression of sns confirms its restricted expression in SOPs (Figure 3E), providing evidence that IRM genes participate in the segregation of SOPs from surrounding epithelial cells. Similarly, E-cadherin ( E-cad ) and N-cadherin ( N-cad) are expressed in a non-overlapping fashion that are hallmarks of differential cell adhesion process in Drosophila wing and eye tissues (Classen et al, 2005; Hayashi & Carthew, 2004; Schäfer et al, 2014; Togashi et al, 2024), with enrichment of E-cad expression in the clusters epithelial , socket-building cell and margin , and high expression of N-cad in the SOP cluster. These results suggest that Notch-driven lateral inhibition is coupled with the differential expression of CAMs to drive SOP spacing and specification within the butterfly pupal wing epithelium.…”

Section: Resultsmentioning

confidence: 99%

Lepidopteran scale cells derive from sensory organ precursors through a canonical lineage

Loh,

DeMarr,

Tsimba

et al. 2024

Preprint

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The success of butterflies and moths is tightly linked to the origin of scales within the group. A long-standing hypothesis postulates that scales are homologous to the well-described mechanosensory bristles found in the fruit flyDrosophila melanogaster, where both derive from an epithelial precursor specified by lateral inhibition that then undergoes multiple rounds of division. Previous histological examination and candidate gene approaches identified parallels in genes involved in scale and bristle development. Here, we provide definitive developmental and transcriptomic evidence that the differentiation of lepidopteran scales derives from the canonical cell lineage, known as the Sensory Organ Precursor (SOP). Live imaging in moth and butterfly pupae shows that SOP cells undergo two rounds of asymmetric divisions that first abrogate the neurogenic lineage, and then lead to a differentiated scale precursor and its associated socket cell. Single-nucleus RNA sequencing across a time-series of early pupal development revealed differential gene expression patterns that mirror canonical lineage development, including Notch-Delta signalling components, cell adhesion molecules, cell cycling factors, and terminal cell differentiation markers, suggesting a shared origin of the SOP developmental program. Additionally, we recovered a novel gene, the POU-domain transcription factorpdm3, involved in the proper differentiation of butterfly wing scales. Altogether, these data open up avenues for understanding scale type specification and development, and illustrate how single-cell transcriptomics provide a powerful platform for understanding the evolution of cell types.

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