The early ANTP gene repertoire: insights from the placozoan genome.
The evolution of ANTP genes in the Metazoa has been the subject of conflicting hypotheses derived from full or partial gene sequences and genomic organization in higher animals. Whole genome sequences have recently filled in some crucial gaps for the basal metazoan phyla Cnidaria and Porifera. Here we analyze the complete genome of Trichoplax adhaerens, representing the basal metazoan phylum Placozoa, for its set of ANTP class genes. The Trichoplax genome encodes representatives of Hox/ParaHox-like, NKL, and extended Hox genes. This repertoire possibly mirrors the condition of a hypothetical cnidarian-bilaterian ancestor. The evolution of the cnidarian and bilaterian ANTP gene repertoires can be deduced by a limited number of cis-duplications of NKL and "extended Hox" genes and the presence of a single ancestral "ProtoHox" gene.
Schierwater
Bernd
B
Division of Ecology and Evolution, Stiftung Tieraerztliche Hochschule Hannover, Hannover, Germany.
Kamm
Kai
K
Srivastava
Mansi
M
Rokhsar
Daniel
D
Rosengarten
Rafael D
RD
Dellaporta
Stephen L
SL
D000818:Animals; D051943:Antennapedia Homeodomain Protein / Q000235:genetics*; D003063:Cnidaria / Q000235:genetics*; D016678:Genome; D014157:Transcription Factors / Q000235:genetics
D051943:Antennapedia Homeodomain Protein; D014157:Transcription Factors