5. 4 Collection and Subculture of Euglena ทรานสฟอร์แมนต์
Cells subjected to drug selection were collected as
follows. Culture was performed on the selective plate medium at
27°C for about 2 weeks, and lawn-like cells on the plate were
suspended in 5 ml of sterile water to collect the cells. The
cells in the cell สารแขวนลอย were counted, and the cells (0.5x106
cells) were cultured again in a selective plate medium (25 µg/ml
or 50 µg/ml of ซีโอซิน, 100 µg/ml of ซีโฟแทกซีม). After growth,
the cells were suspended and cultured again in the selective
plate medium. The initial number of cells in culture was reduced from 0.5x106 cells in a stepwise manner with each passage. After several passages, a single โคโลนี formed on the selective plate medium was collected and cultured in 3 ml of selective liquid
medium (50 lag/ml of ซีโอซิน, 50 µg/ml of ซีโฟแทกซีม), the cells
that showed good growth were used as an isolated Euglena ทรานสฟอร์แมนต์.
5. 5 Investigating the Stability of Introduced Trait in Euglena ทรานสฟอร์แมนต์
The cells were repeatedly subcultured in a KH liquid
medium containing 50 [tg/ml of ซีโอซิน, and the resulting cells
were repeatedly subcultured in a ซีโอซิน-free KH liquid medium for
the number of the times indicated in Figs. 14 and 15. The
subculturing was performed by transferring 1/150 the amount of cells into a fresh KH liquid medium every week.
The thus-obtained cells, which had not been exposed to
the drug for a certain period of time, were cultured again in a
KH liquid medium containing 50 jig/ml of ซีโอซิน, and their growth was investigated.
[0067]
The cells that continued to be cultured in the absence
of ซีโอซิน for a certain period of time were also used in the
following DNA or RNA analysis.
[0068]
5. 6 Detection of Introduced Gene
5. 6. 1 Total DNA Extraction from Euglena ทรานสฟอร์แมนต์
The Euglena ทรานสฟอร์แมนต์ was cultured in a ซีโอซิน-
containing medium or a ซีโอซิน-free medium for 4 to 5 days,
collected by centrifugation, and washed twice with PBS(-) (the
composition of 10xPBS(-) is shown in Table 5) . The resulting
ทรานสฟอร์แมนต์ was suspended in NTES (Table 6) in an amount that
was three to four times the volume of the cells and heated at 65°C
for 10 minutes. Further, the same amount of PCI was added,
followed by vigorous stirring and centrifugation (17,400xg, 4°C, 5
min). To the supernatant collected from this, an equal amount of
PCI was added, followed by stirring. Centrifugation was then
performed again. To the collected supernatant, a 1/10-fold amount
of 3M NaOAc was added. After inverting several times, a 2.5-fold
amount of 100 ethanol was added, followed by mixing. The
resulting mixture was allowed to stand at room temperature for 15
minutes and subjected to centrifugation (11,100xg, 4°C, 5 min).
The supernatant was completely removed, and the precipitate was
washed with 1 ml of 70% ethanol. The precipitate was air-dried at room temperature and dissolved in 20 µg/ml of a TE buffer
containing RNase A, followed by RNA degradation at 37°C overnight. The obtained solution was used as a total DNA solution.
5. 4 Collection and Subculture of Euglena ทรานสฟอร์แมนต์Cells subjected to drug selection were collected asfollows. Culture was performed on the selective plate medium at 27°C for about 2 weeks, and lawn-like cells on the plate weresuspended in 5 ml of sterile water to collect the cells. Thecells in the cell สารแขวนลอย were counted, and the cells (0.5x106cells) were cultured again in a selective plate medium (25 µg/mlor 50 µg/ml of ซีโอซิน, 100 µg/ml of ซีโฟแทกซีม). After growth, the cells were suspended and cultured again in the selectiveplate medium. The initial number of cells in culture was reduced from 0.5x106 cells in a stepwise manner with each passage. After several passages, a single โคโลนี formed on the selective plate medium was collected and cultured in 3 ml of selective liquid medium (50 lag/ml of ซีโอซิน, 50 µg/ml of ซีโฟแทกซีม), the cellsthat showed good growth were used as an isolated Euglena ทรานสฟอร์แมนต์.5. 5 Investigating the Stability of Introduced Trait in Euglena ทรานสฟอร์แมนต์The cells were repeatedly subcultured in a KH liquidmedium containing 50 [tg/ml of ซีโอซิน, and the resulting cells were repeatedly subcultured in a ซีโอซิน-free KH liquid medium forthe number of the times indicated in Figs. 14 and 15. Thesubculturing was performed by transferring 1/150 the amount of cells into a fresh KH liquid medium every week.The thus-obtained cells, which had not been exposed to the drug for a certain period of time, were cultured again in aKH liquid medium containing 50 jig/ml of ซีโอซิน, and their growth was investigated.[0067]The cells that continued to be cultured in the absence of ซีโอซิน for a certain period of time were also used in thefollowing DNA or RNA analysis.[0068]5. 6 Detection of Introduced Gene5. 6. 1 Total DNA Extraction from Euglena ทรานสฟอร์แมนต์ The Euglena ทรานสฟอร์แมนต์ was cultured in a ซีโอซิน-containing medium or a ซีโอซิน-free medium for 4 to 5 days,collected by centrifugation, and washed twice with PBS(-) (thecomposition of 10xPBS(-) is shown in Table 5) . The resultingทรานสฟอร์แมนต์ was suspended in NTES (Table 6) in an amount that was three to four times the volume of the cells and heated at 65°Cfor 10 minutes. Further, the same amount of PCI was added,followed by vigorous stirring and centrifugation (17,400xg, 4°C, 5min). To the supernatant collected from this, an equal amount ofPCI was added, followed by stirring. Centrifugation was then performed again. To the collected supernatant, a 1/10-fold amountof 3M NaOAc was added. After inverting several times, a 2.5-fold
amount of 100 ethanol was added, followed by mixing. The
resulting mixture was allowed to stand at room temperature for 15
minutes and subjected to centrifugation (11,100xg, 4°C, 5 min).
The supernatant was completely removed, and the precipitate was
washed with 1 ml of 70% ethanol. The precipitate was air-dried at room temperature and dissolved in 20 µg/ml of a TE buffer
containing RNase A, followed by RNA degradation at 37°C overnight. The obtained solution was used as a total DNA solution.
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