ATTO Kronos HT

ATTO Kronos HT High Throughput Real-Time Luciferase Assay System

Biological clock, organ clock and cell clock

WSL-1565 Kronos HT is the high throughput support model of the assay system that measure the gene expression of living cells in real-time with the bioluminescence of luciferase. Kronos Dio, which is a precedent model compatible with 35 mm dish, has been used as a real-time luminescence measurement system with cell culturing function, but this time a new lineup of model compatible with multiwell plate measurement is added.
With this new product Kronos HT, we succeeded the know-how cultivated in the precedent model in order to measure the luminescence while culturing the cells, and further strengthened functions and performance for high throughput measurement. Please consider adopting Kronos HT for high-throughput measurement in biological clock analysis, change in drug response with time, cytotoxicity test etc.

Reporter assay in real time with culturing cells

Reporter assay is used to measure the transcriptional activity of gene transcription regulatory sequences such as promoters, for researches on drug response and gene expression control, evaluation of gene transfer efficiency, and so on. Among them, the method of measuring the amount of bioluminescence using bioluminescent enzyme luciferase using a device called a luminometer is superior in terms of high sensitivity and low background and is widely used.
Usually, transcription activity at a certain point (end point) is measured, but the assay is also becoming used for tracking transcription activity over time such as stimulation response, time course of transgene expression level, periodic variation of biological clock gene. Kronos HT is a system to optimize for such assays with the ability to monitor the bioluminescence over time as cells are cultured.

Time course of drug response

Long-term kinetics of activity inhibition

Monitoring of biological clock

chronomedicine, research progresses in the world.

• High sensitive and low noise detection by cooling of detectors (PMTs)
• Compatible with multicolor luciferase assay
• Easy setting with software on Windows PC, and displaying and saving measurement data in real time.

Sample stage (setting two of 24 well plates) Exchanged to 96 well plate adaptor (option)


Setting measurement conditions

You can set it by simple operation. Setting operation can be omitted by using the function to save and load the setting condition as a file.

Display measurement data in real time

Since the data under measurement is displayed in real time, you can check how the measured value changes over time. Measurement data is automatically saved and the data file can be taken out even during measurement.

Data processing

It has a smoothing function to remove noise component from data and smooth it, a multicolor calculation function to calculate each color emission value from measurement value of each filter, and a detrending function to extract rhythm variation of biological clock.

Data export

Since data can be exported as a CSV format file, it can be managed and edited with spreadsheet software such as Microsoft Excel or other analysis software. Also, you can export the graph list of each data as an image file.


Circadian rhythm of clock gene expression

Transcriptional activity of clock gene, mPer2
mPer2 promoter - Eluc (PEST) expressed fibroblast stable cell line in 24 well clear bottom plate Measurement time: 5s / well, Interval time: 10min

Drug response of transcription factor

Dual-color real-time luciferase assay of TNF-α induced NF-κB transcriptional activity

NF-κB response elemnt - TK promoter - SLG (green color emited luciferase) and TK promoter - SLR (red color emitted luciferase) expressed fibroblast cell line in 96 well clear bottom plate
Measurement time: 5s x 2 color / well, Interval time: 30min
(A) Transcriptional activity of NF-κB response element for 48h
(B) Transcriptional activity of TK promoter for 48h
(C) Normalized by activity of control (TK promoter)
(D) Ratio to NF-κB activity without TNF-α



WSL-1565 Kronos HT


Photomultiplier tube (10°C cooling) x 2 units, X-Y actuating


Photon counting method

Measurement time

Integral time: 1 - 60 s/well, Measurement term: 1 h - 30 days

Plate format

Clear bottom 24 well plate x 2

Clear bottom 96 well plate x 2 (Option), 35mm dish x 12 (Option)


48 samples (24 well plate x 2)

192 samples (96 well plate x 2) with an optional item, 96well plate adaptor

12 samples (35mm dish x 12) with an optional item, 35mm dish adaptor

Incubation temperature control

Room temperature + 5°C to 45°C (0.1°C step) at room temperature 20 - 28°C

CO2 gas control

Control to 5% by CO2 gas mixer


Setting of water reservoir in incubator and humidified 5% CO2 gas flowing intermittently by humidifying unit, Maintaining >90%RH

Multi-color assay

Measurement with automatically selected optical filter to 2 colors

(There is also a model for 3 color separation. Request inquiries.)

PC requirements

OS: Windows 10 / 8.1 / 7, 64 / 32 bit, Memory: more than 4 GB, HDD: more than 20 GB free space, Interface: USB2.0 x 1 port

Dimensions, Weight

Main unit: 650 (W) x 520 (D) x 340 (H) mm, 40 kg

CO2 gas mixer: 160(W) x 300 (D) x 200 (H) mm, 4.8 kg

Humidifying unit: 170 (W) x 140 (D) x 115 (H) mm, 1.6kg


Main unit: AC 100 - 240 V, 50 / 60 Hz, 400 W (max)

CO2 gas mixer: AC 100 - 240 V, 50 / 60 Hz, 100 W (max)

Humidifying unit: AC 100 - 240 V, 50 / 60 Hz, 24 W (max)


Code No.

Model / Option


WSL-1565 Kronos HT

Kronos HT main unit, Control software (for Windows PC), CO2 gas mixer, Humidifying unit, 24 well plate adaptor


96 well plate adaptor


35mm dish adaptor