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RNA-seq03:21

RNA-seq

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 microarray-based...
DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...

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Global Gene Expression Analysis Using a Zebrafish Oligonucleotide Microarray Platform
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Combining next-generation sequencing with microarray for transcriptome analysis in rainbow trout gonads.

Makoto Hayashi1, Mana Sato, Yoshiko Iwasaki

  • 1Department of Marine Biosciences, Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo, Japan.

Molecular Reproduction and Development
|October 31, 2012
PubMed
Summary

Researchers developed a novel rainbow trout gonad microarray using next-generation sequencing data. This tool aids in understanding gene expression during gametogenesis, revealing key differences between spermatogonia and somatic cells.

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Area of Science:

  • * Genomics and Transcriptomics
  • * Aquaculture and Fish Biology

Background:

  • * Microarray technology is crucial for genome-wide gene expression analysis.
  • * Limited expressed sequence tag data hinders microarray design for many fish species.
  • * Rainbow trout (Oncorhynchus mykiss) genome information is incomplete, posing challenges for transcriptomic studies.

Purpose of the Study:

  • * To design and validate a novel microarray for rainbow trout gonad gene expression analysis.
  • * To identify genes differentially expressed in spermatogonia (A-SG) and testicular somatic cells.
  • * To provide a tool for studying gametogenesis in rainbow trout.

Main Methods:

  • * Next-generation sequencing of RNA from rainbow trout embryonic genital ridge, testis, and ovary.
  • * Assembly of sequencing reads into contigs and identification of unique sequences.
  • * Design of 55,928 microarray probes and validation using hybridization experiments.

Main Results:

  • * Microarray analysis identified 8,068 transcripts with at least fourfold higher signal in A-SG compared to testicular somatic cells.
  • * Quantitative RT-PCR confirmed significantly higher expression of 14 out of 17 selected transcripts in A-SG.
  • * In situ hybridization revealed A-SG-specific signals for three transcripts in immature trout testis.

Conclusions:

  • * The developed rainbow trout gonad microarray is a valuable tool for gene expression studies.
  • * The microarray facilitates the understanding of gametogenesis and cell-specific gene expression in rainbow trout.
  • * This study provides insights into the molecular mechanisms of spermatogonial development.