Cyanobacterial pattern formations
2005 - present
Cyanobacteria show a great diversity in their cellular and colony morphology. Initially, we studied semiregularly patterned 'heterocyst' differentiation in the filamentous species, Anabaena sp. PCC 7120. Anabaena differentiates heterocyst that is specific for nitrogen fixation at about every 10 cells in the absence of nitrogen source in media. By combinatorial approach of time-lapse single cell monitoring and mathematical simulations, we provided detailed cell lineage profile of non-pre-deterministic heterocyst formation dynamics (Asai et al. PLoS ONE, 2012) and its theoretical property (Ishihara et al. J. theor. Biol. 2014).
Then, Hideo started biomedia art project using cyanobacterial isolates from the wild. Some of them showed striking morphological patterns in their colony formations upon a series of experiments for the arts. Thus, as a biproduct of the art projects, Hideo started scientific research on cyanobacterial colony pattern formations. Especially, we are studying on vortice or comet-like colony pattern formations in Geitlerinema sp., Pseudanabaena sp. and Leptolyngbia sp. It should be noted that our morphological study follows the art, different from a stereotype that scientifically known phenomena are applied to make some arts. We will update our findings after publications in preparation.
Shumpei Hisamoto (2018) "Individual variation and positive feedback initiate aggregation in Lasius japonicus" J. Ethol. 37: 31-39.
Ishihara J, Tachikawa M, H. Iwasaki, Mochizuki A. (2015) "Mathematical study of pattern formation accompanied by heterocyst differentiation in multicellular cyanobacterium." J. Theor. Biol. 21;371:9-23