Detection of carcinoembryonic antigen with sandwich biosensor
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Detection of Carcinoembryonic antigen with sandwich-biosensor. Alexander Pak, Antonina Malozemova , Luiza Niyazmetova, Mukhtar Sadykov , Zeinaf Muradova Nazarbayev University, School of Science and Technology, Department of Biological Sciences. Introduction.

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Detection of Carcinoembryonic antigen with sandwich-biosensor

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Detection of Carcinoembryonic antigen with sandwich-biosensor

Alexander Pak, AntoninaMalozemova, Luiza Niyazmetova, MukhtarSadykov, ZeinafMuradovaNazarbayev University, School of Science and Technology, Department of Biological Sciences


Figure 1. Carcinoembryonic antigen

Carcinoembryonic antigen (CEA) is one of the examples of the biomarker which appears at early stages of such types of cancer as colorectal, gastric, pancreatic, lung, and breast carcinoma [1].


  • To obtain aptamers against carcinoembryonic antigen (CEA)

  • To express streptavidin on yeast and bacterial cell surfaces

  • To make sandwich-biosensor to detect different types of cancer at early stages

Aptamers and SELEX

Figure 2. SELEX procedure

Figure 3. SELEX 11 Figure 4. SELEX 12 gel run

Aptamers – short synthetic oligonucleotides that have high specificity of interaction with a particular target[2]

SELEX – Systematic Evolution of Ligands by Exponential enrichment.

12 cycles of SELEXwere finished

Characterization step of aptamers from cycles 11 and 12 is ongoing

Characterization is done on SPR (Surface Plasmon Resonance), which determines kinetics and affinity of aptamers for CEA.

E.coli expression system


E.coli expression system

Yeast expression system

Yeast expression system

Future plans

Sequence and Synthesis of aptamers

Characterize them via SPR

Construct the parts for E.Coli and S.Cerevisia


1) Cancer diagnosis – information about cancer. (2013). Stranford Cancer Center . Retrieved from

2) Mascini, M. (2009). Aptamers in bioanalysis. John Wiley and Sons

3) Lim, H. K., Hwang, I., Sh., Park. (2011). Biotin-Assisted Folding of Streptavidin on the Yeast Surface. American Institute of Chemical Engineers. Retrieved from:

4) Huang, D. & E., Shusta. (2005). Secretion and Surface Display of Green Fluorescent Protein Institute of Chemical Engineers. Vol 21 No2. (349-357): Retrieved from:

5) Tan, A., Yildirimer, L., Rajadas, J., De La Peña, H., Pastorin, G., Seifalian, A. (2011). Quantum Dots and Carbon Nanotubes in Oncology.Nanomedicine. 6(6):1101-1114. Retrieved from

Thank you for your attention!!!

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