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Updated: Jul 1, 2025

Transcription Start Site Mapping Using Super-low Input Carrier-CAGE

Transcription Start Site Mapping Using Super-low Input Carrier-CAGE

Published on: June 26, 2019

A single-cell genomic strategy for alternative transcript start sites identification.

Yanling Peng¹, Qitong Huang^1,2, Danli Liu¹

¹Animal Functional Genomics Group, Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China.

Biotechnology Journal

|March 12, 2024

Summary

Identifying alternative transcription start sites (TSSs) is crucial for gene regulation. This study introduces a novel single-cell genomic technology to precisely map TSSs and detect cell heterogeneity, revealing more alternative TSSs than previously known.

Keywords:

analytical biotechnology bioinformatics

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Area of Science:

Genomics
Molecular Biology
Cell Biology

Background:

Alternative transcription start site (TSS) usage is vital for gene transcription regulation in mammals.
Accurate genome-wide identification of alternative TSSs presents a significant challenge.

Purpose of the Study:

To develop and apply a novel single-cell genomic technology for alternative TSS annotation.
To detect cellular heterogeneity using alternative TSS profiles.
To investigate the prevalence of alternative TSSs in IFN-β stimulated mouse embryonic fibroblasts (MEFs).

Main Methods:

Utilized Fluidigm C1 system for single-cell capture.
Employed SMARTer cDNA synthesis kit for full-length cDNA recovery.
Applied a dual priming oligonucleotide system for TSS enrichment in genomic analysis.

Main Results:

Successfully discriminated between two IFN-β stimulated MEF populations.
Identified that 81% of expressed genes possess multiple TSSs, exceeding prior estimates (CAGE: 58%, empirical: 54%).
Demonstrated the technology's high sensitivity in detecting alternative TSSs.

Conclusions:

Alternative TSSs are more widespread than previously understood.
The developed single-cell genomic strategy offers unprecedented sensitivity for TSS identification.
This method provides a powerful tool for future studies on the biological significance of alternative TSSs.