Normal Prenatal Growth of the Golden Hamster

Lee, Cha Soo; Nishida, Takao; Mochizuki, Kiyofumi

doi:10.1538/expanim1957.24.2_53

Cited by 4 publications

(2 citation statements)

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“…For each species, age of embryos was plotted against embryo weight and a logarithmic relationship (shown in red) was deduced for a time period including the time period of interest in this study. For hamster, our data (in red) fitted with published data (in black, Lee et al 1975), except for two litters for which coı¨t time was obviously misestimated (see methods for details). Figure S3.…”

Section: Discussionmentioning

confidence: 67%

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Heterochronic shifts explain variations in a sequentially developing repeated pattern: palatal ridges of muroid rodents

Pantalacci

Sémon

Martin

et al. 2009

Evolution and Development

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Metazoans are largely made of repeated parts, and metazoan evolution is marked by changes in the number of these parts, called meristic evolution. Understanding the mechanisms associated with meristic changes is thus a critical issue to evolutionary developmental biology. Palatal rugae are sensory ridges regularly arranged on the hard palate of mammals. They develop sequentially following mesio-distal growth of the palate, and activation-inhibition mechanisms very likely control spacing and timing of this sequential addition. In this study, we characterized trends in rugae number evolution among muroid rodents, showing that most species display 8+/-1 rugae, changes by one being very frequent in the phylogeny. We then compared development of three muroid species: mouse (nine rugae), rat (eight), and golden hamster (seven). We showed that palatal growth rate, spacing, and addition rate in mouse/rat were remarkably similar (with respect to the embryo size difference), and that increase to nine rugae in mouse is achieved by postponing the end of the addition process (hypermorphosis). Such a heterochronic shift may be typical of +/-1 variations observed among muroid rodents. In contrast, decrease to seven rugae in golden hamster is attributed to early growth termination (progenesis) of the palate, which correlates with the severe shortening of gestation in this species. Our results provide an experimental support to the intuitive view that heterochronies are especially relevant to meristic evolution of traits that rely on a sequential addition process. We also interpret our results in the light of developmental constraints specifically linked to this kind of process.

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Section: Discussionmentioning

confidence: 67%

“…For hamster (6 litters), we had inconsistencies between weight or developmental stage as estimated from embryo features and the supposed age of the litter according to mating dates. Comparison with published data (Lee et al 1975) suggested two litters for which the age of gestation had obviously been overestimated ( Fig. S2).…”

Section: Weight To Time Conversionmentioning

confidence: 72%

Heterochronic shifts explain variations in a sequentially developing repeated pattern: palatal ridges of muroid rodents

Pantalacci

Sémon

Martin

et al. 2009

Evolution and Development

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Distribution of actin, myosin, and spectrin during enucleation in erythroid cells of hamster embryo

Takano‐Ohmuro

Mukaida

Morioka

1996

Cell Motil. Cytoskeleton

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Terminal differentiation of yolk-sac erythroid cells of the Syrian hamster in vitro

Morioka

Minamikawa‐Tachino

1991

Roux's Arch Dev Biol

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The developmental fate of Syrian hamster yolk-sac (primitive) erythroid cells was examined in vitro. Highly purified yolk-sac erythroid cells at the polychromatophilic stage, obtained from the peripheral blood of embryos at day 10 of gestation, showed morphological and biochemical changes in our modified semi-solid culture system. Several morphological changes observed in the primitive erythroid cell cultures, such as nuclear condensation, approach of nuclei to the periphery of cells, development by cells of an extended pear-like shape, enucleation, and an increase in haemoglobin content, were quite similar to those of the terminal differentiation of fetal liver or adult bone marrow (definitive) erythroid cells. In addition, the transition of molecular species of haemoglobin from the embryonic to the fetal/adult pattern was also observed in our culture system. Thus we provide evidence, by the in vitro culture of yolk-sac erythroid cells, that primitive erythroid cells undergo terminal differentiation in a manner similar to that of definitive erythroid cells.

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Normal Prenatal Growth of the Golden Hamster

Cited by 4 publications

References 0 publications

Heterochronic shifts explain variations in a sequentially developing repeated pattern: palatal ridges of muroid rodents

Heterochronic shifts explain variations in a sequentially developing repeated pattern: palatal ridges of muroid rodents

Distribution of actin, myosin, and spectrin during enucleation in erythroid cells of hamster embryo

Terminal differentiation of yolk-sac erythroid cells of the Syrian hamster in vitro

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