Biology Essay

540 Words3 Pages
RONEIL HOWE This article was selected due to my interest in symbiotic relationships amongst different species and my current field of study, biotechnology. This article is titled “Symbiotic bacteria program daily rhythms in squid using light and chemical” written by author Jim Sliwa was published on April 2, 2013. This article relates to how the bacteria vibrio fishceri use light and chemical signals to control the circadian-like rhythms in the Euprymna scolopes squids. Throughout the article the author relates to Margaret McFall-Ngai of the University of Wisconsin whose research have led to results indicating the mutualistic relationship between the glowing bacteria and the squid. The E. scolopes encodes proteins which are expressed in its head while the other is expressed in the light organ where the bacteria lives. It was also noted that the gene for this protein, escry1, was highly expressed in the light organ therefore causing the gene to be cycled with the bioluminescence of the squid and not the environmental light. The question arose as to whether it was the bacteria light or the bacteria itself that was controlling the cycling of the gene escry1 but experiments in which bacteria were absent or if the luminescence was mimicked the gene failed to cycle. This showed that both bacteria and its light were necessary. In ongoing researches biologists have found out that the epithelium of the stomach and the mucosal immune system seems to be controlled by clock genes such as escry1. So in conclusion it was asked if it was the bacteria in these locations that were influencing these genes. This article was well written. The first line of the article basically summarized everything to be mentioned afterwards: “Glowing bacteria inside squids use light and chemical signals to control circadian-like rhythms in the animals”. We clearly see the point of the mutualistic

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