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. 1986 Nov;83(21):8249–8252. doi: 10.1073/pnas.83.21.8249

Trophic molecules and evolution of the nervous system.

I B Black
PMCID: PMC386905  PMID: 3022286

Abstract

Although recent work has reemphasized the general importance of ontogeny in evolution, underlying developmental molecular mechanisms are largely undefined. What heritable ontogenetic mechanisms result in the evolution of new morphologies and functions? Such questions are particularly difficult in the nervous system, in which each of 10(11) neurons forms approximately equal to 10(4) specific interconnections. I propose that specific heritable, trophic interactions during development, which determine cell survival and pathway size, form a substrate for neural evolution. This model is based on the observation that neurons are vastly overproduced during ontogeny; neurons, their pathways and connections are dependent on target-derived trophic factors for developmental survival; and co-innervating, functionally and anatomically distinct neural populations compete for common trophic factors for survival. Focusing on sympathetic and sensory neurons, which require the target-derived, trophic protein nerve growth factor at different times for developmental survival, and which innervate common targets, different classes of ontogenetic evolutionary mechanisms may be characterized. Evolution may occur from heritable changes in the structure of trophic gene products or altered timing of expression. Molecular mechanisms underlying heterochrony are thereby described. The model is directly applicable to evolution of the brain and is testable in a variety of situations.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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