Higher tRNA diversity in thermophilic bacteria: a possible adaptation to growth at high temperature.
We have done a comparative study of tRNA diversity and total tRNA genes among different strains of bacteria with respect to the optimum growth temperature of the cells. Our observation suggests that higher tRNA diversity usually occurs in thermophiles in comparison to non-thermophiles. Among psychrophiles total tRNA was observed to be more than two-fold higher than in the non-psychrophiles. Though tRNA diversity and total tRNA have recently been shown to be affected by an organism's genomic GC% and growth rate, this work is the first report on growth temperature affecting these features in bacteria. This work extends the list of molecular features undergoing adaptation due to growth temperature and supports the view that growth temperature acts as a selecting factor at the molecular level during evolution.
Satapathy
Siddhartha Sankar
SS
Department of Computer Science and Engineering, Tezpur University, Tezpur, Assam 784 028, India. ssankar@tezu.ernet.in
Dutta
Malay
M
Ray
Suvendra Kumar
SK
D000220:Adaptation, Biological; D001419:Bacteria / Q000235:genetics* / Q000254:growth & development* / Q000378:metabolism; D001482:Base Composition; D005075:Biological Evolution; D014644:Genetic Variation; D006358:Hot Temperature; D012329:RNA, Bacterial / Q000235:genetics* / Q000378:metabolism; D012343:RNA, Transfer / Q000235:genetics* / Q000378:metabolism; D012641:Selection, Genetic
D012329:RNA, Bacterial; D012343:RNA, Transfer