Palpitomonas bilix represents a basal cryptist lineage: insight into the character evolution in Cryptista

Akinori Yabuki; Ryoma Kamikawa; Sohta A Ishikawa; Martin Kolisko; Eunsoo Kim; Akifumi S Tanabe; Keitaro Kume; Ken-ichiro Ishida; Yuji Inagki

doi:10.1038/srep04641

Palpitomonas bilix represents a basal cryptist lineage: insight into the character evolution in Cryptista

Sci Rep. 2014 Apr 10:4:4641. doi: 10.1038/srep04641.

Authors

Akinori Yabuki¹, Ryoma Kamikawa², Sohta A Ishikawa³, Martin Kolisko⁴, Eunsoo Kim⁵, Akifumi S Tanabe⁶, Keitaro Kume⁷, Ken-ichiro Ishida⁷, Yuji Inagki⁸

Affiliations

¹ 1] Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan [2].
² 1] Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Kyoto, Japan [2] Graduate School of Global Environmental Studies, Kyoto University, Kyoto, Kyoto, Japan [3].
³ 1] Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan [2] Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan.
⁴ 1] Departments of Biology, Dalhousie University, Halifax, Nova Scotia, Canada [2].
⁵ Sackler Institute for Comparative Genomics and Division of Invertebrate Zoology, American Museum of Natural History, New York, NY, USA.
⁶ 1] Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan [2].
⁷ Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan.
⁸ 1] Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan [2] Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.

Abstract

Phylogenetic position of the marine biflagellate Palpitomonas bilix is intriguing, since several ultrastructural characteristics implied its evolutionary connection to Archaeplastida or Hacrobia. The origin and early evolution of these two eukaryotic assemblages have yet to be fully elucidated, and P. bilix may be a key lineage in tracing those groups' early evolution. In the present study, we analyzed a 'phylogenomic' alignment of 157 genes to clarify the position of P. bilix in eukaryotic phylogeny. In the 157-gene phylogeny, P. bilix was found to be basal to a clade of cryptophytes, goniomonads and kathablepharids, collectively known as Cryptista, which is proposed to be a part of the larger taxonomic assemblage Hacrobia. We here discuss the taxonomic assignment of P. bilix, and character evolution in Cryptista.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Amino Acid Sequence
Base Sequence
Biodiversity
Biological Evolution
Cell Lineage
Cryptophyta / classification*
Cryptophyta / genetics*
Evolution, Molecular
Gene Expression Profiling
Molecular Sequence Data
Phylogeny
Sequence Alignment
Sequence Analysis, RNA
Transcriptome / genetics