EVIDENCE OF ANCIENT GENOME REDUCTION IN RED ALGAE (RHODOPHYTA) SCIE SCOPUS

Cited 38 time in WEB OF SCIENCE Cited 36 time in Scopus
Title
EVIDENCE OF ANCIENT GENOME REDUCTION IN RED ALGAE (RHODOPHYTA)
Author(s)
Qiu, Huan; Price, Dana C.; Yang, Eun Chan; Yoon, Hwan Su; Bhattacharya, Debashish
KIOST Author(s)
Yang, Eun Chan(양은찬)
Publication Year
2015-08
Abstract
Red algae (Rhodophyta) comprise a monophyletic eukaryotic lineage of similar to 6,500 species with a fossil record that extends back 1.2 billion years. A surprising aspect of red algal evolution is that sequenced genomes encode a relatively limited gene inventory (similar to 5-10 thousand genes) when compared with other free-living algae or to other eukaryotes. This suggests that the common ancestor of red algae may have undergone extensive genome reduction, which can result from lineage specialization to a symbiotic or parasitic lifestyle or adaptation to an extreme or oligotrophic environment. We gathered genome and transcriptome data from a total of 14 red algal genera that represent the major branches of this phylum to study genome evolution in Rhodophyta. Analysis of orthologous gene gains and losses identifies two putative major phases of genome reduction: (i) in the stem lineage leading to all red algae resulting in the loss of major functions such as flagellae and basal bodies, the glycosylphosphatidylinositol anchor biosynthesis pathway, and the autophagy regulation pathway; and (ii) in the common ancestor of the extremophilic Cyanidiophytina. Red algal genomes are also characterized by the recruitment of hundreds of bacterial genes through horizontal gene transfer that have taken on multiple functions in shared pathways and have replaced eukaryotic gene homologs. Our results suggest that Rhodophyta may trace their origin to a gene depauperate ancestor. Unlike plants, it appears that a limited gene inventory is sufficient to support the diversification of a major eukaryote lineage that possesses sophisticated multicellular reproductive structures and an elaborate triphasic sexual cycle.
ISSN
0022-3646
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/40399
DOI
10.1111/jpy.12294
Bibliographic Citation
JOURNAL OF PHYCOLOGY, v.51, no.4, pp.624 - 636, 2015
Publisher
WILEY-BLACKWELL
Subject
HORIZONTAL GENE-TRANSFER; PHOTOSYNTHETIC EUKARYOTES; TRANSFER-RNA; EVOLUTION; ORIGIN; BIOSYNTHESIS; SEQUENCE; PLASTIDS; REVEALS; PATHWAY
Keywords
flagella loss; genome reduction; GPI biosynthesis; horizontal gene transfer; Rhodophyta
Type
Article
Language
English
Document Type
Article
Publisher
WILEY-BLACKWELL
Related Researcher
Research Interests

Algae,Systematics,Ecology,조류,계통,생태

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