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Author: search.filters.author.Silvana ZanlungoSubject: search.filters.subject.gene mapping

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    Understanding the phenotypic variability in Niemann-Pick disease type C (NPC): a need for precision medicine
    (2023)
    Macarena Las Heras
    ;
    Benjamín Szenfeld
    ;
    Rami A. Ballout
    ;
    Emanuele Buratti
    ;
    Silvana Zanlungo
    <jats:title>Abstract</jats:title><jats:p>Niemann-Pick type C (NPC) disease is a lysosomal storage disease (LSD) characterized by the buildup of endo-lysosomal cholesterol and glycosphingolipids due to loss of function mutations in the <jats:italic>NPC1</jats:italic> and <jats:italic>NPC2</jats:italic> genes. NPC patients can present with a broad phenotypic spectrum, with differences at the age of onset, rate of progression, severity, organs involved, effects on the central nervous system, and even response to pharmacological treatments. This article reviews the phenotypic variation of NPC and discusses its possible causes, such as the remaining function of the defective protein, modifier genes, sex, environmental cues, and splicing factors, among others. We propose that these factors should be considered when designing or repurposing treatments for this disease. Despite its seeming complexity, this proposition is not far-fetched, considering the expanding interest in precision medicine and easier access to multi-omics technologies.</jats:p>
    Scopus© Citations 7  2
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    Identification of genetic modifiers of murine hepatic β-glucocerebrosidase activity
    (2021)
    Anyelo Durán
    ;
    Boris Rebolledo-Jaramillo
    ;
    Valeria Olguin
    ;
    Marcelo Rojas-Herrera
    ;
    Macarena Las Heras
    Scopus© Citations 6  2
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    A Mouse Systems Genetics Approach Reveals Common and Uncommon Genetic Modifiers of Hepatic Lysosomal Enzyme Activities and Glycosphingolipids
    (2023)
    Anyelo Durán
    ;
    David A. Priestman
    ;
    Macarena Las Las Heras
    ;
    Boris Rebolledo-Jaramillo
    ;
    Valeria Olguín
    <jats:p>Identification of genetic modulators of lysosomal enzyme activities and glycosphingolipids (GSLs) may facilitate the development of therapeutics for diseases in which they participate, including Lysosomal Storage Disorders (LSDs). To this end, we used a systems genetics approach: we measured 11 hepatic lysosomal enzymes and many of their natural substrates (GSLs), followed by modifier gene mapping by GWAS and transcriptomics associations in a panel of inbred strains. Unexpectedly, most GSLs showed no association between their levels and the enzyme activity that catabolizes them. Genomic mapping identified 30 shared predicted modifier genes between the enzymes and GSLs, which are clustered in three pathways and are associated with other diseases. Surprisingly, they are regulated by ten common transcription factors, and their majority by miRNA-340p. In conclusion, we have identified novel regulators of GSL metabolism, which may serve as therapeutic targets for LSDs and may suggest the involvement of GSL metabolism in other pathologies.</jats:p>
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