Spatially Encoded Biological Assays

a technology of biological assays and spatial encoded data, applied in the field of biological assays, can solve the problems of low spatial resolution, high cost, laborious, and inability to enable simultaneous measurement of the expression of many genes or the presence and/or activity of multiple proteins at many spatial locations in a sample,

Inactive Publication Date: 2019-10-03
PROGNOSYS BIOSCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The invention encompasses assay systems that provide high-resolution spatial maps of biological activity in tissues. The assay system comprises an assay capable of high levels of multiplexing where encoded probes are provided to a biological sample in defined spatial patterns; instrumentation capable of controlled delivery of reagents according to the spatial patterns; and a decoding scheme providing a readout that is digital in nature. In short, the present invention provides the ability to look at many biological targets in many locations, providing the resolution of in situ hybridization with the highly- parallel data analysis of sequencing.
[0015]Other embodiments of the invention provide an assay system to determine spatial patterns of abundance or activity or both of multiple protein targets at multiple sites in a sample, where the assay system performs the following steps: providing a sample affixed to a support; delivering encoded probes for the multiple protein targets to the multiple sites in the sample in a known spatial pattern, where each encoded probe comprises a protein probe region that may interact with the protein targets and a coding tag that identifies a location of the site to which the encoded probe was delivered and the protein probe region of the encoding probe of which the coding tag is part; allowing the encoded probes to interact with the protein targets; separating encoded probes that interact with the protein targets from encoded probes that do not interact with the protein targets; determining all or a portion of a sequence of the encoded probes by high throughput sequencing, and associating the abundance or activity or both of the multiple protein targets to the locations of the multiple sites in the sample.

Problems solved by technology

As useful as these methods are, however, they do not enable simultaneous measurement of the expression of many genes or the presence and / or activity of multiple proteins at many spatial locations in a sample.
Laser capture microdissection has permitted the analysis of many genes at a small number of locations, but it is very expensive, laborious, and does not scale well.
Certain PCR assays in a 2D format preserve spatial information (see Armani, et al., Lab on a Chip, 9(24): 3526-34 (2009)), but these methods have low spatial resolution because they rely on physical transference of tissue into wells, which also prevents random access to tissue samples and high levels of multiplexing.
At present, no practical method exists to analyze at high resolution the spatial expression patterns of large numbers of genes, proteins, or other biologically active molecules simultaneously.

Method used

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  • Spatially Encoded Biological Assays
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  • Spatially Encoded Biological Assays

Examples

Experimental program
Comparison scheme
Effect test

example 1

roof of Concept of Encoding Scheme

[0151]As an initial proof of concept, a model system is developed using a microarray to demonstrate a working single-plex assay. The basic design validates the concept of the assay, and establishes a working assay prior to addressing issues related to the analysis of a more complicated biological sample. Conventional sequencing is used as a readout for this proof of concept.

[0152]A microarray is used as a proxy for a tissue section. The target sequences of the microarray are fully specified, so that the composition of the targets are known and can be varied systematically. Synthetic oligonucleotide templates are attached to a glass slide via a 5′ amino modification. Each slide has a single oligonucleotide template sequence, and the assays that are carried out may employ either ligation, or extension followed by ligation as this may be useful in determining certain polymorphisms.

[0153]Once the in situ part of the assay is complete, the reaction produ...

example 2

ty

[0154]The complexity of the assay system is increased to establish scalability of the assay for use in high throughput studies. Scalability of both the spatial encoding and assay systems is demonstrated by carrying out a 24-plex×24-site assay using a microarray model system.

[0155]The amount of biological target, here a DNA target sequence, at each assay location is systematically varied on microarray substrate. For example, in a microarray with 50 micron spot size (center to center), a 1 mm2 area contains ˜400 spots. The region around each site is optionally occupied by a region that is devoid of these spots to allow individual resolvability of the target sequences. Alternatively, the spots may be clustered, with two or more directly adjacent spots surrounded by or adjacent to a region that is devoid of target sequences.

[0156]In order to demonstrate that spatial encoding is accurate, the sites comprise different target compositions to show that the assay readout matches the expect...

example 3

n of the Assay to Preserved Samples

[0159]Genomic DNA is assayed as a proof of concept for assaying RNA, as it provides a way to establish a single-copy reference signal. Once a working assay is developed for FFPE samples, it is adapted to an RNA assay. To this end, assay oligonucleotide concentrations are assayed to ensure compatibility with high multiplexing. Assuming a cell diameter of 10 microns, and delivery of a 10 micron diameter reagent droplet to an individual cell, the volume of the droplet will be ˜500 μl and can contain ˜3×1011 molecules at a 1 μM concentration. To assay 1,000 target sequences in 10,000 cells, 2,000 targeting oligonucleotides would be required in a droplet. Therefore, each droplet could contain ˜160 million copies of each assay oligo, a vast excess over the few thousand target sequences in a cell.

[0160]The handling of small absolute numbers of product molecules generated from very small or compromised samples are enhanced to counter the issue of low recov...

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Abstract

The present invention provides assays and assay systems for use in spatially encoded biological assays. The invention provides an assay system comprising an assay capable of high levels of multiplexing where reagents are provided to a biological sample in defined spatial patterns; instrumentation capable of controlled delivery of reagents according to the spatial patterns; and a decoding scheme providing a readout that is digital in nature.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 16 / 430,015, filed Jun. 3, 2019, which is a continuation of U.S. patent application Ser. No. 16 / 414,213, filed on May 16, 2019, which is a continuation of U.S. patent application Ser. No. 16 / 402,098 filed May 2, 2019, which is a continuation of U.S. patent application Ser. No. 16 / 276,235 filed Feb. 14, 2019, which is a continuation application of U.S. patent application Ser. No. 15 / 187,661 filed Jun. 20, 2016 (now U.S. Pat. No. 10,308,892), which is a continuation of 13 / 080,616 filed Apr. 5, 2011 (now U.S. Pat. No. 9,371,598), which claims the benefit of U.S. Provisional Patent Application No. 61 / 321,124, filed Apr. 5, 2010, each of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]This invention relates to assays of biological molecules, and more particularly to assays for determining spatial distributions of a large number of biological mo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/6837C40B30/04C12Q1/6841C12Q1/6834C12Q1/6809C40B60/04G01N33/68C12Q1/6869G01N33/53C12Q1/6874C12Q1/6804
CPCG01N33/6845C12Q1/6874C12Q1/6804G01N2458/10G01N33/5308C12Q1/6809C12Q1/6869C40B60/04C12Q1/6841C12Q1/6837C12Q1/6834C40B30/04G01N33/6848C12Q1/6827C12Q2521/501C12Q2535/122C12Q2537/143C12Q2543/10C12Q2565/518G01N33/543G01N2458/40
Inventor CHEE, MARK S.
Owner PROGNOSYS BIOSCI
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