Variable cell positions and cell contacts underlie morphological evolution of the rays in the male tails of nematodes related to Caenorhabditis elegans

Article Abstract:

Pattern formation genes that regulate cell recognition or adhesion proteins, or genes that specify cell recognition and adhesion proteins, may be affecting morphology of the male genitalia in 10 species of Rhabditidae, the family of nematodes that includes Caenorhabditis elegans. Some variable morphological characteristics are discussed, with a special focus on the different arrangements of the caudal papillae or rays within the acellular fan. The development of the ray cells within the epidermis of the last larval stage was analyzed, and evolutionary changes in the arrangements of the rays were traced to changes in cell positions and cell contacts.

Genetic aspects, Evolution (Biology), Evolution, Nematoda, Nematodes, Morphology (Animals), Animal morphology

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From cell fates to morphology: developmental genetics of the Caenorhabditis elegans male tail

Article Abstract:

Gene information direct development and morphogenesis of multicellular organisms. Genetic analysis of wild type and mutant Caenorhabditis elegans male tails elicit cell-fate-determining mechanisms involved in organ development. Genes that control sex-specific differentiation, modulate developmental time and determine cell regional positions, correct differentiation and asymmetrical segregation of cellular components have been identified in C. elegans. Research also show that epidermal differentiation and interactions determine non-equivalent morphogenesis of C. elegans rays.

Developmental genetics, Caenorhabditis elegans

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Molecular principles of hair follicle induction and morphogenesis

Article Abstract:

The hair follicle (HF) is the most prominent miniorgan of the skin and one of the defining features of mammalian species. The morphological characteristics, major underlying principles and molecular key players that control the HF development are introduced.

United States, Science & research, Hair follicles

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