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Scaling of cardiac morphology is interrupted by birth in the developing sheep Ovis aries.

Snelling, EP, Seymour, RS, Giussani, DA, Fuller, A, Maloney, SK, Farrell, AP, Mitchell, D, George, KP, Dzialowski, EM, Jonker, SS and Wube, T (2019) Scaling of cardiac morphology is interrupted by birth in the developing sheep Ovis aries. Journal of Anatomy. ISSN 1469-7580

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Abstract

Scaling of the heart across development can reveal the degree to which variation in cardiac morphology depends on body mass. In this study, we assessed the scaling of heart mass, left and right ventricular masses, and ventricular mass ratio, as a function of eviscerated body mass across fetal and postnatal development in Horro sheep Ovis aries (~50-fold body mass range; N = 21). Whole hearts were extracted from carcasses, cleaned, dissected into chambers and weighed. We found a biphasic relationship when heart mass was scaled against body mass, with a conspicuous 'breakpoint' around the time of birth, manifest not by a change in the scaling exponent (slope), but rather a jump in the elevation. Fetal heart mass (g) increased with eviscerated body mass (Mb , kg) according to the power equation 4.90 Mb0.88 ± 0.26 (± 95%CI) , whereas postnatal heart mass increased according to 10.0 Mb0.88 ± 0.10 . While the fetal and postnatal scaling exponents are identical (0.88) and reveal a clear dependence of heart mass on body mass, only the postnatal exponent is significantly less than 1.0, indicating the postnatal heart becomes a smaller component of body mass as the body grows, which is a pattern found frequently with postnatal cardiac development among mammals. The rapid doubling in heart mass around the time of birth is independent of any increase in body mass and is consistent with the normalization of wall stress in response to abrupt changes in volume loading and pressure loading at parturition. We discuss variation in scaling patterns of heart mass across development among mammals, and suggest that the variation results from a complex interplay between hard-wired genetics and epigenetic influences.

Item Type: Article
Additional Information: This is the peer reviewed version of the following article: Snelling, E. P., Seymour, R. S., Giussani, D. A., Fuller, A. , Maloney, S. K., Farrell, A. P., Mitchell, D. , George, K. P., Dzialowski, E. M., Jonker, S. S. and Wube, T. (2019), Scaling of cardiac morphology is interrupted by birth in the developing sheep Ovis aries. J. Anat.. which has been published in final form at https://doi.org/10.1111/joa.12990 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions
Uncontrolled Keywords: 0903 Biomedical Engineering, 1116 Medical Physiology
Subjects: Q Science > QP Physiology
R Medicine > R Medicine (General)
Divisions: Sport & Exercise Sciences
Publisher: Wiley
Related URLs:
Date Deposited: 24 Apr 2019 08:52
Last Modified: 25 Apr 2019 23:13
DOI or Identification number: 10.1111/joa.12990
URI: http://researchonline.ljmu.ac.uk/id/eprint/10582

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