The invention provides methods of detecting transthyretin (TTR) using a capture antibody and a reporter antibody. The capture antibody binds preferentially to misfolded TTR over native tetrameric form of TTR. The capture antibody binds to an epitope within amino acid residues 89-97 or TTR or to an epitope within amino acid residues 101-109 of TTR. 9D5 and 18C5 are examples of suitable capture antibodies. The methods can be used for diagnosing diseases or disorders associated with TTR accumulation or accumulation of TTR deposits (e.g., TTR amyloidosis) and for monitoring the efficacy of TTR therapies, among other applications.

Aspects of the disclosure relate to methods and compositions (e.g., kits) for detecting repeat-associated non-ATG (RAN) proteins in a subject (e.g., a subject having or suspected of having a disease associated with RAN protein translation, for example amyotrophic lateral sclerosis (ALS) and/or frontotemporal dementia (FTD), or spinocerebellar ataxia type 36 (SCA36), or other diseases that produce poly(PR), poly(GR) or poly(GP) RAN proteins. In some embodiments, methods described by the disclosure comprise detecting one or more RAN proteins in a biological sample obtained from a subject by an electrochemiluminescence-based immunoassay using one or more anti-RAN protein antibodies. In some embodiments, the disclosure relates to kits comprising one or more anti-RAN antibodies and an electrochemiluminescence-based immunoassay plate and/or reagents.

The invention relates to methods for conducting binding assays in an assay device that includes one or more storage and use zone. The storage zones of the assay device are configured to house one or more reagents used in an assay conducted in the use zone of the device.

This system takes in raw cellular material collected using a provided swab, blood collection device, urine collection device, or other sample collection device and transforms that biological material into a digital result, identifying the presence, absence and/or quantity of nucleic acids, proteins, and/or other molecules of interest.

A method of monitoring detection of an analyte in a liquid sample using a measuring cell, the measuring cell comprising a working electrode for excitation of electrochemiluminescence in the liquid sample, an optical detector for detecting the excited electrochemiluminescence, the excitation and detection being performed in an measurement cycle, the measurement cycle comprising transporting the liquid sample via a transport path to the working electrode using a support liquid, the method comprising: coupling light of a light source into the transport path during part of the measurement cycle, the transport path forming a light guide between the light source and the optical detector, detecting the coupled light by the optical detector, analyzing the detected light for a gas bubble in the transport path, providing a measurement state if the result of the analysis deviates from a target state regarding the presence of a gas bubble in the transport path.

The invention provides a method of preparing a .sup.89Zr-oxine complex of the formula

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The invention also provides a method of labeling a cell with the .sup.89Zr-oxine complex and a method for detecting a biological cell in a subject comprising administering the .sup.89Zr-oxine complex to the subject.

The present disclosure provides a method for signal amplification of electrochemical sensing of target analytes. The method includes irradiating a complex comprising a target analyte and a nanoparticle, with a light source in proximity to an electrochemical sensor. The method further includes conducting electrochemical sensing, by the electrochemical sensor, with respect to the irradiated complex to determine a presence or quantity of the target analyte. The present disclosure also provides a system for detecting a target analyte. The system includes an electrochemical sensor, a potentiostat, and a light source. The electrochemical sensor includes a plurality of electrodes and configured to perform an assay to detect a presence or quantity of a target analyte in a sample. The potentiostat is operatively coupled to the electrochemical sensor. The light source is configured to irritate a complex including the target analyte formed during the assay.

Devices, systems, and methods for detecting molecules of interest within a collected sample are described herein. In certain embodiments, self-contained sample analysis systems are disclosed, which include a reusable reader component, a disposable cartridge component, and a disposable sample collection component. The reader component may communicate with a remote computing device for the digital transmission of test protocols and test results. In various disclosed embodiments, the systems, components, and methods are configured to identify the presence, absence, and/or quantity of particular nucleic acids, proteins, or other analytes of interest, for example, in order to test for the presence of one or more pathogens or contaminants in a sample.

This system takes in raw cellular material collected using a provided swab, blood collection device, urine collection device, or other sample collection device and transforms that biological material into a digital result, identifying the presence, absence and/or quantity of nucleic acids, proteins, and/or other molecules of interest.

The invention provides a method of preparing a .sup.89Zr-oxine complex of the formula. The invention also provides a method of labeling a cell with the .sup.89Zr-oxine complex and a method for detecting a biological cell in a subject comprising administering the .sup.89Zr-oxine complex to the subject. ##STR00001##