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RNA-seq03:21

RNA-seq

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RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while...
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Unique Molecular Identifier-Based High-Resolution HLA Typing and Transcript Quantitation Using Long-Read Sequencing.

Caleb Cornaby1, Maureen C Montgomery1, Chang Liu2

  • 1Molecular Immunology Laboratory, McLendon Clinical Laboratories, UNC Health, Chapel Hill, NC, United States.

Frontiers in Genetics
|July 26, 2022
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Summary
This summary is machine-generated.

This study introduces a rapid RNA sequencing method for Human Leukocyte Antigen (HLA) typing and transcript expression analysis. The assay provides accurate results in 7-8 hours, crucial for timely deceased donor transplants.

Keywords:
HLAimmunogenetics allele-specific expression, high-resolution HLAlong-readnanoporeunique molecular identifier (UMI)

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Area of Science:

  • Immunogenetics
  • Molecular Biology
  • Genomics

Background:

  • Human Leukocyte Antigen (HLA) typing is critical for transplants and diagnosing various diseases.
  • Understanding HLA transcript expression offers additional diagnostic and prognostic value.
  • Current HLA typing methods can be time-consuming, posing challenges for time-sensitive applications like deceased donor transplantation.

Purpose of the Study:

  • To develop and validate a rapid, high-resolution assay for HLA genotyping and transcript expression analysis using long-read RNA sequencing.
  • To assess the feasibility of this assay for clinical applications, particularly for deceased donors.

Main Methods:

  • A cohort was evaluated using long-read RNA sequencing.
  • NGSEngine was used for HLA genotyping and Athlon2 for normalized mRNA transcript expression.
  • The assay's accuracy and speed were assessed.

Main Results:

  • The assay demonstrated excellent concordance (99.7%) for HLA typing.
  • Accurate HLA genotyping and normalized HLA transcript expression were achieved in 7-8 hours.
  • Significantly lower expression of HLA-C compared to HLA-A and HLA-B was observed, consistent with previous findings. Class II transcript expression was generally lower than class I.

Conclusions:

  • A rapid, high-resolution RNA-Seq based assay for HLA typing and allele-specific transcript expression has been developed.
  • The assay's speed is suitable for clinical applications, including timely assessment for deceased donors.
  • This method provides valuable genetic and expression data for various clinical scenarios.