The molecular basis of mucolipidosis type IV.

Abstract:

:Mucolipidosis Type IV (MLIV) is a lysosomal storage disorder that is characterized by severe neurologic and ophthalmologic abnormalities. It is a progressive disease that usually presents during the first year of life with mental retardation, corneal opacities, and delayed motor milestones. First described in 1974, MLIV is a rare autosomal recessive disease and the majority of patients diagnosed to date are of Ashkenazi Jewish descent. MLIV was originally classified as a lysosomal storage disorder due to the abnormal accumulation of mucopolysaccharides and lipids. Extensive studies in MLIV cells, however, have shown that the abnormal storage is due to a defect in the late endocytic pathway. Positional cloning led to the recent discovery of a novel gene on human chromosome 19, MCOLN1, that is mutated in MLIV. To date 14 independent mutations have been reported in MCOLN1, with two mutations accounting for 95% of the Ashkenazi Jewish MLIV alleles. The identification of the MLIV gene has led to a simple tool for definitive diagnosis and will permit carrier screening in the Ashkenazi Jewish population. MCOLN1 is a new member of the transient receptor potential (TRP) cation channel gene family. The protein encoded by MCOLN1, mucolipin-1, has six predicted transmembrane domains and a putative channel pore. The identification of mutations in MCOLN1 represents the first example of a neurological disease caused by a TRP-related channel. While the function of mucolipin-1 is currently unknown, homology to the TRP superfamily and the recent description of the C. elegans mucolipin-1 homolog allow us to begin to speculate about the role of mucolipin-1 in diverse cellular processes.

journal_name

Curr Mol Med

authors

Slaugenhaupt SA

doi

10.2174/1566524023362276

keywords:

subject

Has Abstract

pub_date

2002-08-01 00:00:00

pages

445-50

issue

5

eissn

1566-5240

issn

1875-5666

journal_volume

2

pub_type

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