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By J.-C. Carel, Paul A. Kelly

ISBN-10: 3540261923

ISBN-13: 9783540261926

In mammals, the most important components excited about the law of physique development are identified: insulin-like development components (IGF) are key regulators of somatic development. progress hormone (GH), secreted via the pituitary gland, at once regulates circulating degrees of IGF-I, that's the main coordinator of spatio-temporal development of the organism. In people, progress is much more complicated, concerning a few particular features now not present in different species. those comprise speedy intrauterine development, deceleration simply after start, a mid-childhood development spurt, a moment deceleration ahead of puberty, a youngster progress spurt, and eventually complete statural progress, that's noticeable just a little later. The mixed wisdom in regards to the endocrine and paracrine points of progress have resulted in the creation of remedy regimens, foremost in GH-deficient little ones. notwithstanding, measurement depends upon the mix of a couple of genetic components, and there stay numerous features of this complicated strategy nonetheless poorly understood.

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Evolution 51: 1699-1711 Schmidt-Nielsen K (1984) Scaling: why is animal size so important? Cambridge University Press, Cambirdge Swofford DL, Maddison WP (1987) Reconstructing ancestral character states under Wagner parsimony. Math Biosci 87: 199-229 Van Valen L (1973) Body size and numbers of plants and animals. Evolution 27: 27-35 Walker AC (1967) Patterns of extinctions among the subfossil Madagascan lemuroids. In: Martin PS, Wright HEJ (eds) Pleistocene extinctions. Yale University Press, New Haven, pp 425-432 Webster AJ, Purvis A (2002) Testing the accuracy of methods for reconstructing ancestral states of continuous characters.

In contrast, population studies with good ascertainment are more likely to inform identification of common genetic determinants of size at birth. Such studies require more resources and are more expensive and, from our arguments detailed above, these cohorts should include a complex phenotype. As well as accurate measurement of size at birth, including weight, length, and head circumference, these studies would be helped by inclusion of some measure of postnatal weight gain over the first year of life.

We showed that partial inactivation of IGF-1R causes postnatal growth deficits that appear during the postnatal growth spurt and persist in the adult. We found that these growth deficits depend on the dosage of the IGF-1R gene. In our mutant mice, the postnatal growth of males relied more strongly on IGF-1R levels than the growth of females. Experiments using tissue-specific IGF-1R inactivation in the central nervous system provided evidence that IGF signaling in the brain may play a key role during the development of the somatotrope function in mammals.

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Deciphering Growth by J.-C. Carel, Paul A. Kelly

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