Dataset Information

A metabolomics exploration of the sexual phase in the marine diatom Pseudo-nitzschia multistriata

ABSTRACT: Pseudo-nitzschia multistriata is a planktonic diatom species with a diplontic life cycle comprising a short sexual phase during which gametes are produced from the encounter of two diploid cells of opposite mating type (MT). Gene expression studies have highlighted the presence of substantial changes occurring at the onset of sexual reproduction. Collectively, there is clear evidence of a chemical cross talk which mediates the mating step.Herein, we have hypothesized that these major transcriptomic changes are associated to variations in the amount and nature of the metabolites produced by the cells. In order to investigate such chemical diversity in an unbiased manner, we undertook an untargeted metabolomics approach. Liquid chromatography – tandem mass spectrometry was applied to investigate the differences in the metabolic profiles between control cells in the vegetative phase (MT+ and MT-) and mixed strains of opposite MTs (cross) undergoing sexual reproduction. Of the 2408 high-quality features obtained, 70 known metabolites could be identified based on in-house libraries and online databases; molecular networking proved valuable to classify additional 47 non-identified features.The present exploratory study provides an overview of the chemical diversity detectable in P. multistriata, presenting a dynamic picture of the changes occurring during sexual reproduction. In particular, the reduction of phytol detected in the cross can be linked to the general downregulation of photosynthesis during sexual reproduction observed elsewhere. The dysregulation of other metabolites stands as a starting point for the understanding of the mechanisms regulating sexual reproduction: a metabolite that was tentatively identified as 7-dehydrodesmosterol exhibited the highest upregulation in the comparison between the two MTs of opposite sex, as well as between MT+ vs cross.The effects of extraction solvents and harvesting times on the ensemble of endo-metabolites were also analyzed.

INSTRUMENT(S): Liquid Chromatography MS - positive - hilic

SUBMITTER: Federica Fiorini

PROVIDER: MTBLS1714 | MetaboLights | 2020-06-29

REPOSITORIES: MetaboLights

ACCESS DATA

Dataset's files

Source:

			Action	DRS
	MTBLS1714	Other
	FILES	Other
	a_MTBLS1714_LC-MS_positive_hilic_metabolite_profiling.txt	Txt
	i_Investigation.txt	Txt
	m_MTBLS1714_LC-MS_positive_hilic_metabolite_profiling_v2_maf.tsv	Tabular

Items per page:

1 - 5 of 6

Publications

A Metabolomics Exploration of the Sexual Phase in the Marine Diatom <i>Pseudo-nitzschia multistriata</i>.

Fiorini Federica F Borgonuovo Camilla C Ferrante Maria Immacolata MI Brönstrup Mark M

Marine drugs 20200614 6

<i>Pseudo-nitzschia multistriata</i> is a planktonic marine diatom with a diplontic life cycle comprising a short sexual phase, during which gametes are produced following the encounter of two diploid cells of opposite mating type (MT). Gene expression studies have highlighted the presence of substantial changes occurring at the onset of sexual reproduction. Herein, we have hypothesized that the amount and nature of cellular metabolites varies along the mating process. To capture the metabolome ...[more]

PMID: 32545923

Similar Datasets

Project description:Pseudo-nitzschia multistriata is a planktonic diatom species with a diplontic life cycle comprising a short sexual phase during which gametes are produced from the encounter of two diploid cells of opposite mating type (MT). Gene expression studies have highlighted the presence of substantial changes occurring at the onset of sexual reproduction. Collectively, there is clear evidence of a chemical cross talk which mediates the mating step. Herein, we have hypothesized that these major transcriptomic changes are associated to variations in the amount and nature of the metabolites produced by the cells. In order to investigate such chemical diversity in an unbiased manner, we undertook an untargeted metabolomics approach. Liquid chromatography – tandem mass spectrometry was applied to investigate the differences in the metabolic profiles between control cells in the vegetative phase (MT+ and MT-) and mixed strains of opposite MTs (cross) undergoing sexual reproduction. Of the 2408 high-quality features obtained, 70 known metabolites could be identified based on in-house libraries and online databases; molecular networking proved valuable to classify additional 47 non-identified features. The present exploratory study provides an overview of the chemical diversity detectable in P. multistriata, presenting a dynamic picture of the changes occurring during sexual reproduction. In particular, the reduction of phytol detected in the cross can be linked to the general downregulation of photosynthesis during sexual reproduction observed elsewhere. The dysregulation of other metabolites stands as a starting point for the understanding of the mechanisms regulating sexual reproduction: a metabolite that was tentatively identified as 7-dehydrodesmosterol exhibited the highest upregulation in the comparison between the two MTs of opposite sex, as well as between MT+ vs cross. The effects of extraction solvents and harvesting times on the ensemble of endo-metabolites were also analyzed.