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Comment on "Multiple repressive mechanisms in the hippocampus during memory formation".

Rebecca S Mathew, Hillary Mullan, Jan Krzysztof Blusztajn

    Science (New York, N.Y.)
    |August 3, 2016
    PubMed
    Summary

    Gene repression in the brain after fear conditioning impacts memory. This study suggests choroid plexus contamination in hippocampal samples may affect findings on gene expression related to memory formation.

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    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Genetics

    Background:

    • Gene repression is implicated in hippocampal memory formation following contextual fear conditioning.
    • Previous studies suggest specific candidate genes are involved in this process.

    Purpose of the Study:

    • To investigate the expression patterns of candidate genes after contextual fear conditioning.
    • To validate the role of gene repression in hippocampal memory formation.

    Main Methods:

    • Analysis of gene expression levels in hippocampal and choroid plexus tissues.
    • Comparison of gene expression profiles at different time points after fear conditioning.

    Main Results:

    • Observed low expression of top candidate genes in hippocampal samples.
    • Detected robust expression of these genes in the choroid plexus.
    • Found gene repression occurring 4 hours post-conditioning.

    Conclusions:

    • The study suggests potential contamination of hippocampal samples with choroid plexus messenger RNAs.
    • This contamination may confound the interpretation of gene expression data related to hippocampal memory formation.