Observing development through evolutionary eyes: a practical approach

Article Abstract:

Interspecific comparisons of two or more genes that interact in specific developmental functions are compared for their molecular basis in order to observe molecular coevolutions which have led to divergence between species, and to find out how these molecular coevolutions can occur while maintaining normal biological functions. This is a step towards understanding the mechanisms of divergence in developmental systems of widely disparate species, which are also related by the same ancestors.

Chemical evolution, Molecular evolution

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A maternal RNA localized in the yellow crescent is segregated to the larval muscle cells during ascidian development

Article Abstract:

To identify clones encoding RNAs localized in the myoplasm or yellow crescent, a cDNA library based on one-cell zygotes of the ascidian Styela clava was screened. Results showed that the myoplasm contains a special maternal RNA which is associated with the cytoskeleton and becomes segregated to the muscle cells during ascidian embryogenesis. The yellow crescent (YC) RNA is suggested as a new example of a class of noncoding RNAs that make a significant contribution to growth and development.

Research, Analysis, Developmental genetics, RNA, Muscle cells

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Evolution of alternate modes of development in ascidians

Article Abstract:

The occurrence of adultation, caudalization and anural development in different species of ascidians allows a study of the mechanisms involved in the evolution of different ontogenies. In ascidians, an analysis of cell lineages reveals that regulation of gene expression during gametogenesis and during embryonic stages is the primary mechanism responsible for the differences in their developmental modes.

Heterochrony (Biology)

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