Whole-Embryo 3D Quantification Reveals Flexible Cellular Scaling and Conserved Tissue Architecture in Xenopus Species
- 1Harvard Medical School
Abstract
How embryos with markedly different absolute sizes and cell numbers establish comparable tissue organization during development remains a fundamental question in developmental biology. To address this question, we compared two closely related Xenopus species that differ substantially in embryonic size, Xenopus laevis and Xenopus tropicalis. We generated a whole-embryo quantitative 3D atlas of cell allocation, spatial organization, and mitotic dynamics at key time points between gastrulation to tailbud stages. Using tissue clearing, and 3D imaging we tracked single-nucleus coordinates across developmental milestones to resolve how body plans adapt to organismal scale. We show that embryonic scaling is not achieved through simple proportional changes in cell number. Instead, the smaller X. tropicalis embryo is characterized by a distinct high-density tissue organization associated with a persistently higher mitotic index (~1.4-fold higher than in X. laevis at both gastrula and tailbud stages). Across development, this is accompanied by a near-doubling of cell number in X. tropicalis without a proportional increase in embryo volume. We quantify tissue organization and find species-specific cellular architectures during gastrulation that largely converge by the tailbud stage. At this stage, homologous tissues display broadly similar structural profiles despite persistent differences in embryo size, cell number, and density. Together, our findings reveal that closely related vertebrate embryos can follow distinct cellular organization trajectories while converging toward comparable tissue architecture, providing a quantitative framework for understanding robust body plan formation across divergent physical scales.
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BibTeX
@misc{santos2026wholeembryo,
title = {{Whole-Embryo 3D Quantification Reveals Flexible Cellular Scaling and Conserved Tissue Architecture in Xenopus Species}},
author = {H. M. Santos and M. Diakova and M. Brambach and C. Anderson and K. Petrova and C. A. De Araujo and I. Simeonova and G. Almouzni and L. Peshkin and J. G. Abreu},
howpublished = {bioRxiv},
year = {2026},
month = jun,
doi = {10.64898/2026.06.16.732511},
url = {https://www.biorxiv.org/content/10.64898/2026.06.16.732511v3},
note = {CC BY},
}
RIS
TY - UNPB
TI - Whole-Embryo 3D Quantification Reveals Flexible Cellular Scaling and Conserved Tissue Architecture in Xenopus Species
AU - H. M. Santos
AU - M. Diakova
AU - M. Brambach
AU - C. Anderson
AU - K. Petrova
AU - C. A. De Araujo
AU - I. Simeonova
AU - G. Almouzni
AU - L. Peshkin
AU - J. G. Abreu
PY - 2026
DA - 2026/06/16
PB - bioRxiv
DO - 10.64898/2026.06.16.732511
UR - https://www.biorxiv.org/content/10.64898/2026.06.16.732511v3
AB - How embryos with markedly different absolute sizes and cell numbers establish comparable tissue organization during development remains a fundamental question in developmental biology. To address this question, we compared two closely related Xenopus species that differ substantially in embryonic size, Xenopus laevis and Xenopus tropicalis. We generated a whole-embryo quantitative 3D atlas of cell allocation, spatial organization, and mitotic dynamics at key time points between gastrulation to tailbud stages. Using tissue clearing, and 3D imaging we tracked single-nucleus coordinates across developmental milestones to resolve how body plans adapt to organismal scale. We show that embryonic scaling is not achieved through simple proportional changes in cell number. Instead, the smaller X. tropicalis embryo is characterized by a distinct high-density tissue organization associated with a persistently higher mitotic index (~1.4-fold higher than in X. laevis at both gastrula and tailbud stages). Across development, this is accompanied by a near-doubling of cell number in X. tropicalis without a proportional increase in embryo volume. We quantify tissue organization and find species-specific cellular architectures during gastrulation that largely converge by the tailbud stage. At this stage, homologous tissues display broadly similar structural profiles despite persistent differences in embryo size, cell number, and density. Together, our findings reveal that closely related vertebrate embryos can follow distinct cellular organization trajectories while converging toward comparable tissue architecture, providing a quantitative framework for understanding robust body plan formation across divergent physical scales.
ER -