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Title: Genomic analysis of organismal complexity in the multicellular green alga Volvox carteri

Analysis of the Volvox carteri genome reveals that this green alga's increased organismal complexity and multicellularity are associated with modifications in protein families shared with its unicellular ancestor, and not with large-scale innovations in protein coding capacity. The multicellular green alga Volvox carteri and its morphologically diverse close relatives (the volvocine algae) are uniquely suited for investigating the evolution of multicellularity and development. We sequenced the 138 Mb genome of V. carteri and compared its {approx}14,500 predicted proteins to those of its unicellular relative, Chlamydomonas reinhardtii. Despite fundamental differences in organismal complexity and life history, the two species have similar protein-coding potentials, and few species-specific protein-coding gene predictions. Interestingly, volvocine algal-specific proteins are enriched in Volvox, including those associated with an expanded and highly compartmentalized extracellular matrix. Our analysis shows that increases in organismal complexity can be associated with modifications of lineage-specific proteins rather than large-scale invention of protein-coding capacity.
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Publication Date:
OSTI Identifier:
1010539
Report Number(s):
LBNL-4207E
Journal ID: ISSN 0036-8075; TRN: US201108%%450
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Science-Research; Journal Volume: 329; Journal Issue: 5988
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Genomics Division
Country of Publication:
United States
Language:
English
Subject:
59; ALGAE; CAPACITY; CHLAMYDOMONAS; GENES; INVENTIONS; MODIFICATIONS; PROTEINS