Single embryo-resolution quantitative analysis of reporters permits multiplex spatial cis-regulatory analysis

Area of Science:

• Developmental Biology
• Genomics
• Molecular Biology

Background:

• Cis-regulatory modules (CRMs) are crucial for controlling gene expression during embryonic development.
• Existing methods for measuring spatial CRM activity are time-consuming and low-throughput.
• There is a need for efficient techniques to analyze CRM function in a spatially resolved manner.

Purpose of the Study:

• To develop a high-throughput method for simultaneously measuring quantitative and spatial CRM activities.
• To overcome the bottleneck of slow, one-by-one methods for spatial CRM activity measurement.
• To enable systems-wide functional analyses of CRMs in embryonic development.

Main Methods:

• Developed a novel high-throughput method combining multiplexing and mosaic observations.
• Utilized single-embryo resolution quantitative CRM activity profiles as 'fingerprints' for spatial patterns.
• Applied the method to sea urchin embryos for validation.

Main Results:

• The new method, MMOSAIC, efficiently predicts spatial activities of novel CRMs.
• MMOSAIC successfully detects spatial responses of CRMs to genetic perturbations.
• Demonstrated simultaneous measurement of quantitative and spatial CRM activities.

Conclusions:

• The MMOSAIC method significantly advances the ability to study CRM function in embryos.
• This technique facilitates high-throughput, systems-level understanding of gene regulation.
• MMOSAIC is expected to accelerate functional genomics research in developmental biology.