RRC ID 48706
Author Shiba K, Inaba K.
Title Inverse relationship of Ca2+-dependent flagellar response between animal sperm and prasinophyte algae.
Journal J Plant Res
Abstract Symmetry/asymmetry conversion of eukaryotic flagellar waveform is caused by the changes in intracellular Ca2+. Animal sperm flagella show symmetric or asymmetric waveform at lower or higher concentration of intracellular Ca2+, respectively. In Chlamydomonas, high Ca2+ induces conversion of flagellar waveform from asymmetric to symmetry, resulting in the backward movement. This mirror image relationship between animal sperm and Chlamydomonas could be explained by the distinct calcium sensors used to regulate the outer arm dyneins (Inaba 2015). Here we analyze the flagellar Ca2+-response of the prasinophyte Pterosperma cristatum, which shows backward movement by undulating four flagella, the appearance similar to animal sperm. The moving path of Pterosperma shows relatively straight in artificial seawater (ASW) or ASW in the presence of a Ca2+ ionophore A23187, whereas it becomes circular in a low Ca2+ solution. Analysis of flagellar waveform reveals symmetric or asymmetric waveform propagation in ASW or a low Ca2+ solution, respectively. These patterns of flagellar responses are completely opposite to those in sperm flagella of the sea urchin Anthocidaris crassispina, supporting the idea previously proposed that the difference in flagellar response to Ca2+ attributes to the evolutional innovation of calcium sensors of outer arm dynein in opisthokont or bikont lineage.
Volume 130(3)
Pages 465-473
Published 2017-5-1
DOI 10.1007/s10265-017-0931-7
PII 10.1007/s10265-017-0931-7
PMID 28424932
MeSH Animals Calcium / metabolism* Carrier Proteins / metabolism Chlamydomonas / metabolism Chlamydomonas / physiology Chlorophyta / metabolism* Chlorophyta / physiology Cilia / metabolism Dyneins / metabolism Flagella / metabolism* Flagella / physiology Male Microtubules / metabolism Microtubules / physiology Movement Protozoan Proteins / metabolism Sea Urchins / metabolism Seawater Sperm Tail / metabolism* Sperm Tail / physiology Spermatozoa / metabolism* Spermatozoa / physiology
IF 2.185
Times Cited 5
Algae NIES-626