Integrated on-capillary instrumentation for gene expression measurement directly from cells

Hiroko Matsunaga, Takashi Anazawa, Edward S. Yeung*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

16 Citations (Scopus)


We studied the fundamental instrumental issues relevant to a capillary-based integrated system to measure expression of a specific gene directly from cells. Samples were introduced into a capillary by use of a syringe pump. All reactions were carried out in a microthermocycler, where a part of the capillary having 1 μL inner volume was used as a reaction vessel. First, cells were lysed by heating to release RNA, followed by deoxyribonuclease (DNase) treatment. Then, reverse transcription-polymerase chain reaction (RT-PCR) was performed to obtain amplified products from the targeted mRNA. Finally, the product was verified by capillary electrophoresis (CE) with laser-induced fluorescence detection. The whole protocol was completed in the system in 3 h. PCR product from β-actin mRNA in 16 human lymphoblast cells was obtained with a signal-to-noise ratio (S/N) of 3400 ± 730 (n = 3). Therefore, the system is reproducible and sensitive enough to measure gene expression from a single cell. We show that the amplified fragment from breast cancer-specific mRNA was obtained from cells of breast cancer cell line, but was not obtained from cells of hepatoma cell line. These results therefore lay the foundations for future CE or microchip instrumentation for high-throughput automated gene-expression analysis.

Original languageEnglish
Pages (from-to)458-465
Number of pages8
Issue number3
Publication statusPublished - 2003 Jan
Externally publishedYes


  • Capillary polymerase chain reaction
  • Gene expression measurement
  • Single cells

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry


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