The Cryptophyte Guillardia theta: “–Where’s your genome, Nucleomorph?”
Monography Abstract
During evolution, the second endosymbiosis, with the uptake of a red algae and green algae, gave rise to two distinct lineages with nucleomorph, cryptophytes and chlorarachniophytes, respectively. The nucleomorph, a remnant nucleus was retained in the periplastidial space as a consequence of this event. The study of nucleomorph was based on information of the cryptophyte, Guillardia theta, with the objective to find how is it possible the interchange of genetic information between the plastidial nucleus and host nucleus, through specific membrane transporters. TIC, TOC, SELMA and Sec61 were found to play an important role in the genetic flow between membranes. The genes chlB, chlL, chlN (LIPOR proteins) and dnaX (DNA polymerase III) were targets of genetic loss due to massive gene transfer.
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