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Ribosome Profiling02:24

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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Lactation transcriptomics in the Australian marsupial, Macropus eugenii: transcript sequencing and quantification.

Christophe M Lefèvre1, Matthew R Digby, Jane C Whitley

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Marsupial milk production involves complex gene expression changes. Researchers identified key genes for milk proteins, immune function, and metabolism, revealing new insights into mammary gland development during lactation.

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Area of Science:

  • Mammalian biology
  • Reproductive biology
  • Comparative genomics

Background:

  • Marsupials exhibit highly complex lactation cycles, differing significantly from placental mammals.
  • Tammar wallabies give birth to underdeveloped young, necessitating precise regulation of milk composition and production for neonatal development.

Purpose of the Study:

  • To investigate gene expression patterns in the marsupial mammary gland throughout the lactation cycle.
  • To create a comprehensive catalog of mammary gland transcripts in the tammar wallaby.
  • To analyze variations in milk protein gene expression during different lactation stages.

Main Methods:

  • Construction of diverse cDNA libraries from lactating tammar wallaby mammary tissues.
  • Expressed sequence tag (EST) generation and sequencing (14,837 ESTs).
  • Bioinformatic analysis including sequence assembly and comparative analysis of transcriptomes from different lactation phases.

Main Results:

  • Identification of a large set of mammary gland transcripts, forming a comprehensive catalog.
  • Observation of a consistent increase in genes encoding secreted proteins, particularly milk proteins, throughout lactation.
  • Detection of expressed genes related to immune function, translation, and metabolic processes.

Conclusions:

  • The study provides a detailed molecular inventory of the marsupial mammary gland during lactation.
  • Gene expression profiles highlight the dynamic regulation of milk synthesis and secretion in marsupials.
  • Discovery of novel milk proteins and mammary gland remodeling markers, including non-coding RNAs, offers avenues for future research.