Dataset Information


Analysis of transcript abundances in Ectocarpus life cycle mutants

ABSTRACT: The aim of this experiment was to compare transcript abundances in parthenotes (i.e. organisms derived by parthenogenetic development of gametes) of two life cycle mutants of the brown alga Ectocarpus siliculosus with transcript abundances in the wild type sporophyte and gametophyte generations. This is of interest because the two mutations, immediate upright (imm) and ouroboros (oro), cause partial and almost complete hometic conversion, respectively, of the sporophyte into the gametophyte. imm parthenotes exhibit gametophyte-like morphology during early development but remain sporophytes in functional terms (they do not produce gametes) whereas oro parthenotes behave as functional gametophytes and are morphologically indistinguishable from gametophytes apart from the appearance some minor sporophyte-like features very early in development in some individuals. To minimise genetic background effects the samples for this experiment were derived from a segregating population derived from an imm/IMM oro/ORO sporophyte. Four classes of gametophyte were derived from this sporophyte were IMM/ORO (wild type), imm/ORO, IMM/oro and imm/oro. Parthenomes were bulked to provide a wild type sporophyte sample, samples corresponding to the two individual mutants, plus the double mutant. A wild type gametophyte sample was also compared for comparison. Hybridisations with cDNA derived from these five samples were carried out using a NimbleGen expressed-sequence-tag-(EST-)based microarray carrying probes corresponding to 10,600 of the 16,256 genes identified in the Ectocarpus genome.

ORGANISM(S): Ectocarpus siliculosus  

SUBMITTER: J. Mark Cock  

PROVIDER: E-MTAB-485 | ArrayExpress | 2012-01-14


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OUROBOROS is a master regulator of the gametophyte to sporophyte life cycle transition in the brown alga Ectocarpus.

Coelho Susana M SM   Godfroy Olivier O   Arun Alok A   Le Corguillé Gildas G   Peters Akira F AF   Cock J Mark JM  

Proceedings of the National Academy of Sciences of the United States of America 20110627 28

The brown alga Ectocarpus siliculosus has a haploid-diploid life cycle that involves an alternation between two distinct generations, the sporophyte and the gametophyte. We describe a mutant, ouroboros (oro), in which the sporophyte generation is converted into a functional, gamete-producing gametophyte. The life history of the mutant thus consists of a continuous reiteration of the gametophyte generation. The oro mutant exhibited morphological features typical of the gametophyte generation and  ...[more]

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