mRNA isolation for the purpose of cDNA library construction was
performed in a microfluidic chip device using paramagnetic oligo-dT beads.
The simple Y-intersection flow design mixes beads and sample on-chip, and
uses magnetic trapping to capture, then release the beads. The capillary gel
electrophoresis (CGE) detection of the total unamplified mRNA isolated on-chip,
and of a reverse transcription-polymerase chain reaction (RT-PCR) amplified
rare gene indicated that mRNA could be captured by oligo-dT beads on-chip,
had very good integrity and was suitable for constructing a cDNA library.
The limit of detection for the rare bicoid gene of Drosophila Melanogaster
corresponded to the capture of approximately 2.8 ng of total mRNA from 0.85 μg
of total RNA (TRNA) within the microchip. As much as 34 ng of total mRNA was
estimated to be captured from 10 μg of TRNA.
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