Quantitative neuroimaging in mucolipidosis type IV

Raphael Schiffmann, Joan Mayfield, Caren Swift, Igor Nestrasil

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Mucolipidosis type IV (MLIV) is an autosomal recessive disorder resulting from mutations in the MCOLN1 gene. This gene encodes the endosomal/lysosomal transient receptor potential channel protein mucolipin-1 (TRPML1). Affected patients suffer from neurodevelopmental abnormalities and progressive retinal dystrophy. In a prospective natural history study we hypothesized the presence of an additional slow cerebral neurodegenerative process. We have recruited 5 patients, tested their neurodevelopmental status, and measured cerebral regional volumes and white matter integrity using MRI yearly. Over a period of up to 3. years, MLIV patients remained neurologically stable. There was a trend for increased cortical and subcortical gray matter volumes and increased ventricular size, while white matter and cerebellar volumes decreased. Mean diffusivity (MD) was increased and fractional anisotropy (FA) values were below normal in all analyzed brain regions. There was a positive correlation between motor scores of the Vineland Scale and the FA values in the corticospinal tract (corr coef 0.39), and a negative correlation with the MD values (corr coef - 0.50) in the same brain region. We conclude from these initial findings that deficiency in mucolipin-1 affects the entire brain but that there might be a selective regional cerebral neurodegenerative process in MLIV. In addition, these data suggest that diffusion-weighted imaging might be a good biomarker for following patients with MLIV. Therefore, our findings may be helpful for designing future clinical trials.

Original languageEnglish (US)
Pages (from-to)147-151
Number of pages5
JournalMolecular Genetics and Metabolism
Volume111
Issue number2
DOIs
StatePublished - 2014

Bibliographical note

Funding Information:
This work was carried out in part using computing resources at the University of Minnesota Supercomputing Institute, and was funded in part by the ML4 Foundation and by NIH grant U54 NS065768 . The Lysosomal Disease Network (U54 NS065768) is a part of the National Institutes of Health (NIH) Rare Diseases Clinical Research Network (RDCRN), supported through collaboration between the NIH Office of Rare Diseases Research (ORDR) at the National Center for Advancing Translational Science (NCATS), the National Institute of Neurological Disorders and Stroke (NINDS) and National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

Keywords

  • Lysosomal disorder
  • Mucolipidosis
  • Natural history
  • Volumetry

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