Spatially encoded biological assays

What is this patent about?

’669 is related to the field of spatially encoded biological assays and high-resolution molecular mapping. The technology addresses the challenge of simultaneously measuring the expression, abundance, and activity of numerous biological targets—such as proteins and nucleic acids—while preserving the precise spatial context of those molecules within a complex tissue sample. Traditional methods like laser capture microdissection or standard PCR lack the scalability and resolution required to create comprehensive digital maps of cellular function across a two-dimensional biological surface.

The underlying idea behind ’669 is the use of encoded probes that function as molecular proxies, linking a specific biological interaction to a specific physical location through a digital readout. By conjugating binding agents, such as antibodies or oligonucleotides, to unique DNA-based coding tags, the invention allows biological information to be converted into a sequence-based format. This insight enables researchers to pool samples from various locations for high-throughput analysis without losing the ability to map the data back to the original histological features of the tissue.

The claims of ’669 focus on a method for associating the presence or abundance of target molecules with specific locations in a tissue sample using protein-oligonucleotide conjugates. The process involves delivering a library of these probes to a sample, where each protein binder is linked to a unique identifying sequence. A critical aspect of the claimed method is the integration of tissue imaging to identify specific locations of interest, followed by the sequencing of the tags associated with probes that have successfully bound to their targets at those identified sites.

In practice, the invention utilizes instrumentation capable of controlled reagent delivery to apply these encoded probes in defined spatial patterns. Once the probes interact with their targets—such as proteins binding to specific epitopes—the unreacted probes are separated, and the remaining tags are analyzed using high-throughput digital sequencing. This approach leverages the massive parallelization of modern sequencing technologies to provide a readout that is inherently digital, allowing for the simultaneous detection of thousands of different targets across a single tissue section.

This method differs from prior approaches by decoupling the target identification from the spatial localization, particularly through the use of combinatorial encoding schemes. Unlike traditional in situ hybridization, which is limited by the number of available fluorescent channels, this system uses the vast information density of DNA sequences to identify both the molecule and its coordinates. By transforming spatial biology into a sequencing problem, the invention achieves a level of multiplexing and sensitivity that far exceeds conventional imaging or physical microdissection techniques.