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Comparative cardiovascular development: improving the conceptual framework
Warren Burggren1, Dane A Crossley
1Department of Biological Sciences, University of North Texas, Denton 76205, USA. burggren@unt.edu
Insights
Immature vertebrates have unique cardiovascular physiology distinct from adults. New research suggests incorporating developmental timelines and multivariate analysis for a more accurate understanding of the vertebrate heart and vasculature.
Area of Science:
- Comparative physiology
- Developmental biology
- Cardiovascular science
Background:
- Immature vertebrates (embryos, larvae, fetuses) exhibit distinct cardiovascular physiology compared to adults.
- Current frameworks for studying developmental cardiovascular physiology are often conservative and rely on adult models.
- Established physiological principles for adult cardiovascular systems may be inaccurate for developing systems.
Purpose of the Study:
- To advocate for a modified conceptual framework for understanding developmental cardiovascular physiology.
- To encourage a shift away from adult-centric physiological truisms in developmental studies.
- To highlight the need for novel analytical approaches in comparative cardiovascular development.
Main Methods:
- Emphasis on multivariate approaches for analyzing complex physiological data.
- Differentiation between absolute (extrinsic) and relative (intrinsic) developmental time.
- Employment of time lines for intra- and interspecific comparisons of cardiovascular ontogeny.
Main Results:
- Current analytical approaches, often derived from adult physiology, may underappreciate the complexity of developing cardiovascular systems.
- Incorporating specific methodologies can lead to a more accurate interpretation of cardiovascular development.
- Novelty and complexity of the developing vertebrate cardiovascular system are often overlooked.
Conclusions:
- A revised conceptual framework is needed for developmental cardiovascular physiology.
- Multivariate analysis, developmental time differentiation, and ontogenetic timelines are crucial for accurate research.
- Adopting these approaches will enhance our understanding of the developing vertebrate cardiovascular system.
Abstract:
Immature vertebrates-either as an embryo in an egg, as free-living larva, or as an in utero fetus, are clearly not just small versions of adults. Their cardiovascular physiology (and doubtlessly other aspects of physiology) differs from that of adults both qualitatively and quantitatively. Yet, comparative cardiovascular physiologists have been relatively conservative in constructing a new (or at least modified) conceptual framework for the understanding of developmental cardiovascular physiology. We recommend that this framework rely less on the established cardiovascular truisms for adult cardiovascular physiology that are proving to be less useful and in instances even inaccurate for interpreting development of the heart and vasculature. We have suggested that three methodologies in particular be incorporated to a greater extent in studies of comparative cardiovascular development: (a) emphasis on multivariate approaches; (b) differentiation between absolute (extrinsic) and relative (intrinsic) time for development, and; (c) employment of time lines for both intra- and interspecific comparisons of the ontogeny of cardiovascular processes. While certainly none of these approaches are novel and others have previously dwelt at length on their importance in other contexts, we feel that the emerging framework for investigating cardiovascular physiological development would benefit from incorporating these and other approaches into experimental design as well as data analysis. Failing to do so results in a heavy dependence on analytical approaches typically used for adults, and thus under-appreciates the novelty and complexity of the developing vertebrate cardiovascular system.