Abstract
AbstractThe time that it takes the brain to develop is highly variable across animals. Although staging systems equate major developmental milestones between mammalian species, it remains unclear how distinct processes of cortical development scale within these timeframes. Here, we compare the timing of cortical development in two mammals of similar size but different developmental pace: eutherian mice and marsupial fat-tailed dunnarts. Our results reveal that the temporal relationship between cell birth and laminar specification aligns to equivalent stages between these species, but that migration and axon extension do not scale uniformly according to the developmental stages, and are relatively more advanced in dunnarts. We identify a lack of basal intermediate progenitor cells in dunnarts that likely contributes in part to this timing difference. These findings demonstrate temporal limitations and differential plasticity of cortical developmental processes between similarly sized Therians and provide insight into subtle temporal changes that may have contributed to the early diversification of the mammalian brain.
Funder
Department of Education and Training | Australian Research Council
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry,Multidisciplinary
Reference90 articles.
1. Selwood, L. & Woolley, P. A. A timetable of embryonic development, and ovarian and uterine changes during pregnancy, in the stripe-faced dunnart, Sminthopsis macroura (Marsupialia: Dasyuridae). J. Reprod. Fertil. 91, 213–227 (1991).
2. Sacher, G. A. & Staffeldt, E. F. Relation of gestation time to brain weight for placental mammals: implications for the theory of vertebrate growth. Am. Nat. 108, 593–615 (1974).
3. Butler, H. & Juurlink, B. H. J. An Atlas For Staging Mammalian And Chick Embryos (CRC Press, 1987).
4. Workman, A. D., Charvet, C. J., Clancy, B., Darlington, R. B. & Finlay, B. L. Modeling transformations of neurodevelopmental sequences across mammalian species. J. Neurosci. 33, 7368–7383 (2013).
5. Halley, A. C. Minimal variation in eutherian brain growth rates during fetal neurogenesis. Proc. Biol. Sci. 284, 20170219 (2017).
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