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Selecting for Chlamydomonas reinhardtii fitness in the KSC Veggie Unit

Metadata Updated: December 6, 2023

The Space Algae Experiment Verification Test completed a competitive growth selection on mutagenized microalgae in a series of batch cultures that were passaged for three growth cycles. The experiment was conducted with ground control conditions similar to those actually used in spaceflight. Cultures were limited in growth rate due to gas permeable membranes to provide oxygen and carbon dioxide exchange and a lack of agitation to mix the cells throughout the liquid media. Two strains were grown and three biological replicates were completed for each strain. Specific variables (factors) tested were: 1) The effect of UVC mutagenesis was tested by sampling the algae cultures prior to mutagenesis. 2) The sensitivity of different strains was tested by conducting the experiment with a wild-type and cell wall mutant (cw15) strain. 3) The effect of competitive growth was tested by sampling each biological replicate experiment at the end of each growth cycle. 4) The effect of live culture storage in the dark was tested by sampling each growth cycle twice. At the time of passage a sample of cells was pelleted and frozen. The cultures were then stored in the dark in a Cargo Transport Bag (CTB) to simulate storage on the ISS and return of cultures. This factor tested whether cultures could be stored alive in the dark or if samples needed to be fixed at the time of passage in order to get an accurate representation of the genetic variation in each cycle of growth. Paired-end whole genome sequencing was completed for 38 samples: 2 strains pre mutagenesis and 2 strains X 3 biological replicates X 3 growth cycles X 2 storage conditions.

Access & Use Information

Public: This dataset is intended for public access and use. License: us-pd

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Metadata Created Date January 31, 2023
Metadata Updated Date December 6, 2023
Data Update Frequency irregular

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date January 31, 2023
Metadata Updated Date December 6, 2023
Publisher National Aeronautics and Space Administration
Identifier nasa_genelab_GLDS-265_hac2-mmp8
Data First Published 2021-05-21
Data Last Modified 2023-01-26
Category Earth Science
Public Access Level public
Data Update Frequency irregular
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 55060370-bbc2-4f6f-9473-3500f9314506
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Program Code 026:005
Source Datajson Identifier True
Source Hash 5ff1f14ce6866376f06a6727630af8ffe53a34fa93a620abaf3d63573f8c97c9
Source Schema Version 1.1

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