Starting from fins: parallelism in the evolution of limbs and genitalia: the fin-to-genitalia transition.

Abstract:

:Organizers of the symposium Starting from Fins: Parallelism in the Evolution of Limbs and Genitalia intended it 1) to begin debates and discussions about parallelism, serial homology and transitions in development, as well as evolution of gene function and theories of origins and 2) to examine closely the potential significance of serial homology in understanding the evolution of morphology. This issue of Evolution and Development focuses on unpaired fin to genitalia transitions; the July-August issue will focus on paired fins to limbs, revisit the issues raised in the symposium, and point to future directions. Minelli's opening presentation introduced the central theme of the symposium by suggesting that body appendages such as arthropod and vertebrate limbs, chordate tails and external genitalia are evolutionarily divergent duplicates (paramorphs) of the main body axis. Suzuki's and Podlasek's presentations focused on the development of mammalian genitalia. Suzuki presented Suzuki et al investigations of the role of fibroblast growth factor (Fgf) and Sonic hedgehog (Shh) as signaling molecules during murine external genitalia formation, and Podlasek presented Podlasek et al investigations to elucidate a rudimentary pathway of essential developmental genes and transcriptional regulators such as Hox genes, Sonic hedgehog (Shh), and Bone morphogenetic proteins 2 and 4 (BMP-2; BMP-4), found in the limb. Discussions and questions emerging from the symposium point to the need to recognize that claims of phylogenetic cause must be based on something more than similarities; research must focus on the extent to which comparisons can be taken as well as on the evolutionary significance of similarities.

journal_name

Evol Dev

journal_title

Evolution & development

authors

Rosa-Molinar E,Burke AC

doi

10.1046/j.1525-142x.2002.01067.x

keywords:

subject

Has Abstract

pub_date

2002-03-01 00:00:00

pages

124-6

issue

2

eissn

1520-541X

issn

1525-142X

journal_volume

4

pub_type

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