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Gastrulation01:56

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
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RNA Splicing01:32

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Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Tracking and Quantifying Developmental Processes in C. elegans Using Open-source Tools
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Widespread RNA segregation in a spiralian embryo.

Evan P Kingsley1, Xin Yi Chan, Yingli Duan

  • 1Department of Biology, University of Rochester, Rochester, NY 14627, USA.

Evolution & Development
|November 3, 2007
PubMed
Summary

In Ilyanassa embryos, specific RNAs localize to centrosomes and segregate asymmetrically during early cell divisions, influencing cell fate specification across all lineages. This intricate mechanism highlights the importance of RNA localization in early development.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Molecular Biology

Background:

  • Asymmetric cell divisions are vital for cell fate specification in multicellular organisms.
  • Early embryonic patterning relies differently on asymmetric divisions across species.
  • In Ilyanassa, early cell divisions are predominantly asymmetric, with mRNA localization to centrosomes and segregation to daughter cells.

Purpose of the Study:

  • To conduct an unbiased survey of RNA localization in the Ilyanassa embryo.
  • To investigate the patterns of centrosomal RNA localization during early development.
  • To understand the role of RNA localization and segregation in cell fate specification.

Main Methods:

  • Unbiased survey of RNA localization in the Ilyanassa embryo.
  • Examination of centrosomal localization patterns during early development.
  • Analysis of RNA segregation during cell divisions.

Main Results:

  • 3-4% of RNAs specifically localize to centrosomes during early Ilyanassa development.
  • Centrosomal RNA localization and asymmetric segregation occur in all cells from zygote to the fifth cleavage cycle.
  • Each localized RNA is found in unique cell subsets, indicating intricate spatial regulation.

Conclusions:

  • RNA localization and segregation mechanisms in Ilyanassa are highly complex.
  • These events are crucial for cell fate specification across all lineages in the early embryo.
  • Increased reliance on determinant segregation in early cleavage may constrain developmental patterns in molluscs and spiralians.