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Related Experiment Videos

Crystallin genes: templates for lens transparency.

J Piatigorsky, J M Nickerson, C R King

    Ciba Foundation Symposium
    |January 1, 1984
    PubMed
    Summary

    Crystallin gene structure reveals evolutionary insights. Analysis of recombinant DNAs shows gene duplication and conserved sequences, aiding our understanding of lens proteins and potential cataract treatments.

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    Area of Science:

    • Molecular Biology
    • Evolutionary Biology
    • Genetics

    Background:

    • Crystallins are the major proteins in the vertebrate eye lens.
    • Understanding crystallin gene structure is crucial for insights into evolution and lens function.
    • Cataract, a major cause of blindness, is linked to crystallin structure and function.

    Purpose of the Study:

    • To analyze recombinant DNAs for new information on crystallin evolution and diversity.
    • To relate gene structure to protein structure for beta-crystallins.
    • To investigate the evolutionary origins of beta- and gamma-crystallin gene families.

    Main Methods:

    • Analysis of recombinant DNAs.
    • Gene sequencing and comparison.
    • RNA splicing analysis.

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    Main Results:

    • All crystallin genes contain introns; chicken delta-crystallin genes have 16-17 introns.
    • Beta-crystallin introns correlate with protein structural motifs, suggesting gene-protein structure relationships.
    • Beta- and gamma-crystallins arose from a common ancestral gene via duplications; N-termini diverged, 3' ends conserved.
    • Murine alpha A-crystallin gene contains an intron with coding information for alpha Ains peptide, alternatively spliced to produce different mRNAs.

    Conclusions:

    • Molecular genetics provides deeper appreciation of crystallin evolutionary events and redefines crystallins based on their genes.
    • Understanding crystallin polypeptide and gene structure can contribute to understanding and treating cataract.