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Oligo(U) sequences present in sea urchin maternal RNA decrease following fertilization.

R Duncan, T Humphreys

    Developmental Biology
    |March 1, 1983
    PubMed
    Summary
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    Oligo(U) tracts in sea urchin RNA decrease after fertilization. These RNA sequences, crucial for gene regulation, are significantly reduced in mRNA molecules during early embryonic development.

    Area of Science:

    • Molecular Biology
    • Developmental Biology
    • RNA Biochemistry

    Background:

    • Oligo(U) tracts are regulatory elements in RNA molecules.
    • Their presence and function in early sea urchin development are not fully understood.

    Purpose of the Study:

    • To quantify and characterize oligo(U) tracts in sea urchin egg and early embryo RNA.
    • To investigate changes in oligo(U) tract abundance and association with RNA species during early development.

    Main Methods:

    • Quantitative assay using [3H]poly(A) and RNase T2 protection.
    • Analysis of RNA size classes associated with oligo(U) tracts.

    Main Results:

    • Oligo(U) tracts constitute 0.0035% of egg RNA, decreasing to 0.015% by 2 hours post-fertilization.

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  • Maximum oligo(U) tract size is 15-30 nucleotides.
  • In eggs, oligo(U) is found in both small (100-200 nt) and mRNA-sized RNAs; this association is reduced in mRNA after fertilization.

    • Conclusions:

    • Oligo(U) tracts undergo significant quantitative changes during early sea urchin development.
    • The reduction of oligo(U) in mRNA-sized molecules post-fertilization suggests a role in translational regulation during embryogenesis.