Circulating tumor cells (CTCs) are widely known as useful biomarkers in the liquid biopsies of cancer patients. Although single‐cell genetic analysis of CTCs is a promising diagnostic tool that can provide detailed clinical information for precision medicine, the capacity of single‐CTC isolation for genetic analysis requires improvement. To overcome this problem, we previously developed a multiple single‐cell encapsulation system for CTCs using hydrogel‐encapsulation, which allowed for the high‐throughput isolation of single CTCs. However, isolation of a single cell from adjacent cells remained difficult and often resulted in contamination by neighboring cells due to the limited resolution of the generated hydrogel. We developed a novel multiple single‐cell encapsulation system equipped with a high magnification lens for high throughput and a more accurate single‐cell encapsulation. The multiple single‐cell encapsulation system has sufficient sensitivity to detect immune‐stained CTCs, and could also generate a micro‐scaled hydrogel that can isolate a single cell from adjacent cells within 10 µm, with high efficiency. The proposed system enables high throughput and accurate single‐cell manipulation and genome amplification without contamination from neighboring cells.
Electrochemical sensing systems have been utilized in biosensors because it is easy to integrate the electrodes and electric circuits on miniaturized devices. In contrast, it was hard to integrate photo-sensing systems consisting of advanced optical components (e.g., condensing lenses and optical filters) in small devices due to the difficulties in miniaturization and cost-cutting of those optical components. However, recent efforts overcame this technical barrier, and thus a huge number of two-dimensional (2D) photosensors are equipped in digital cameras and smartphones, and widely used around the world. Technical development of such photosensors led to creation of novel biosensing systems enabling rapid, sensitive, and easy detection of biomolecules and microorganisms. This article summarized our recent achievement on wide-field imaging-based biosensors in which complementary metal oxide semiconductor (CMOS) image sensors were used for detection of various biological objects. In particular, high content analysis of single cells based on the developed photo-biosensing systems is introduced.
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