A bacterial world: A series of stages in evolution

We are living in a bacterial world, and it’s impacting us more than previously thought.” February 15th, 2013 by by Lisa Zyga

Excerpt: The percentage of the human genome that arose at a series of stages in evolution.

Excerpt: The olfactory chemicals that attract some animals (including humans) to their prospective mates are also produced by the animals’ resident bacteria.

Link to article published n PNAS: “Animals in a bacterial world, a new imperative for the life sciences

My comments: The series of stages that involve olfactory chemicals is not random and occurs without mutations.

1. In it’s entirety the article supports non-random adaptive evolution (e.g., sans mutations) via nutrient-dependent pheromone-controlled intracellular signaling and stochastic gene expression as is required for ecological, social, neurogenic, and socio-cognitive niche construction in species from microbes to man.

2. Every section attests to the fact that “Olfaction and odor receptors provide a clear evolutionary trail that can be followed from unicellular organisms to insects to humans.”

3. In that context, their recognition of Lynn Margulis is also especially pertinent: I wrote: “This indicates that reproduction began with an active nutrient uptake mechanism in heterospecifics and that the mechanism evolved to become symbiogenesis in the conspecifics of asexual organisms (Margulis, 1998)

4. I also wrote: “These epigenetic changes probably occur across the evolutionary continuum that includes both nutrition-dependent reproduction in unicellular organisms and sexual reproduction in mammals.”

5. The difference in my published work is that I detail the mechanisms of nutrient-dependent pheromone-controlled hormone organization and activation of behavior in vertebrates and invertebrates — using the honeybee as the model organism that links microbes to man. I have since modeled the molecular mechanisms of the epigenetically-effected microRNA/messenger RNA balance in greater detail.

Author: James Kohl

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