The Science of Existence (136-1) Wood Work

 Wood Work

In trees, transcription factors take control of a cascade of genes that controls the production of wood by differentiating cells into the needed components in the proper proportions. The primary controller protein for wood production regulates gene expression on multiple levels, ensuring proper growth.

What is unusual about the controller in poplars and rockcress is its residence in the cytoplasm, outside the cell nucleus. This is odd, as transcription factor proteins are otherwise always in the nucleus. In this instance, a nucleus-based transcription factor comes and ushers the cytoplasmic controller protein into the nucleus to begin wood work.