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Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
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Expression of open reading frames in silkworm pupal cDNA library.

Yao-Zhou Zhang1, Jian Chen, Zuo-Ming Nie

  • 1College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China. yaozhou@zist.edu.cn

Applied Biochemistry and Biotechnology
|July 13, 2007
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Summary

Researchers constructed a silkworm pupae cDNA library, identifying novel expressed sequence tags (ESTs) and full-length cDNAs. Analysis revealed conserved mRNA structures and potential regulatory elements in promoter regions, advancing silkworm gene expression understanding.

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Area of Science:

  • Genomics and Molecular Biology
  • Entomology
  • Biotechnology

Background:

  • Understanding silkworm (Bombyx mori) gene expression is crucial for silk production and insect biology.
  • Previous genomic and transcriptomic data for Bombyx mori were limited, necessitating further characterization.

Purpose of the Study:

  • To construct and analyze a comprehensive cDNA library from silkworm pupae.
  • To identify novel expressed sequence tags (ESTs) and full-length cDNAs.
  • To investigate gene expression patterns, mRNA structures, and promoter elements in Bombyx mori.

Main Methods:

  • Construction of a cDNA library from whole silkworm pupae.
  • Bioinformatic analysis comparing sequences against databases (GenBank, SilkBase, KAIKOBLAST, RefSeq).
  • Analysis of open reading frame (ORF) expression in Escherichia coli.
  • Survey of nucleotide composition in promoter regions of ESTs.

Main Results:

  • A library of 2409 singletons was created, yielding 498 novel ESTs and 217 unknown ESTs.
  • 1659 full-length cDNAs were identified after comparison with related insect species.
  • Analysis revealed conserved AAUAAA polyadenylation signals in 66.8% of poly(A)-tailed mRNA.
  • The TTTTA box was identified as a potential regulator of transcription and gene expression.

Conclusions:

  • The study provides a valuable resource of silkworm pupae cDNAs and ESTs.
  • Conserved mRNA structural features and novel promoter elements were discovered.
  • Findings contribute to a deeper understanding of gene regulation and expression in Bombyx mori.