Acta Scientific Microbiology (ASMI) (ISSN: 2581-3226)

Review Article Volume 3 Issue 2

Group Behavior of Unicellular Organisms for Better Survival Leading to Multi-Cellular Organisms

Anindya Das*

Assistant Professor, Department of Microbiology, KPC Medical College and Hospital, West Bengal University of Health Science, Kolkata, India

*Corresponding Author: Anindya Das, Assistant Professor, Department of Microbiology, KPC Medical College and Hospital, West Bengal University of Health Science, Kolkata, India.

Received: December 23, 2019; Published: January 11, 2020



  The transition from unicellular to multicellular organization is a major step in eukaryotic evolution. In the beginning unicellular organisms ruled the earth. For more than 3 billion years after the appearance of unicellular microbes, life gradually got more complicated. Today, most plants, animals, fungi, and algae are composed of multiple cells that work collaboratively as a single being. But how did life evolve from unicellular simplicity to multicellular complexity? Explanation to this question is one of the major evolutionary puzzles of our time. In this context it can be said that the group behavior of unicellular organisms with better survival advantage is crucial to the development of multicellularity from unicellular life. It is well known that the bacteria, a primitive life form, remaining in groups in biofilm can well protect themselves from antibacterial substances. This group behavior or colonial form found in other unicellular living forms, like charophytes algae, volvocine algae and choanoflagellates led to increasing organismal size which helped in escaping microscopic predators such as ciliates.It may be presumed that after the development of well advanced eukaryotic cell from prokaryote through endosymbiosis, the well organized genetic structure and better information dissipation capability with critical development of cell membrane signaling pathway with better way of keeping intercellular communication, multiple eukaryotic unicellular forms in a collection followed this group behavior for a long time and receiving triggering factors from multiple sources and switching back and forth of their gene expression based on environmental condition, evolved into multicellular eukaryotic form.

Keywords: Group behavior; Endosymbiosis; Cell differentiation; Cell-cell interaction; Biofilm; Ectoderm; Endoderm; Mesoderm



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Citation: Anindya Das. “Group Behavior of Unicellular Organisms for Better Survival Leading to Multi-Cellular Organisms". Acta Scientific Microbiology 3.2 (2020): 54-57.


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