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Menkes syndrome and animal models
1Scobie and Clare Mackinnon Trace Element Laboratory, Murdoch Institute, Royal Children's Hospital, Parkville, Victoria, Australia. jmercer@cryptic.rch.unimelb.edu.au
The American Journal of Clinical Nutrition
|May 20, 1998
Summary
Menkes syndrome is a genetic copper deficiency caused by mutations in the MNK gene. This gene encodes a copper-transporting ATPase, crucial for cellular copper efflux and homeostasis.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Menkes syndrome is an X-linked genetic disorder causing copper deficiency, often fatal in early childhood.
- Milder variants like occipital horn syndrome primarily affect connective tissues.
- Mutations in the mouse mottled locus serve as models for human Menkes syndrome phenotypes.
Purpose of the Study:
- To elucidate the genetic basis of Menkes syndrome and related disorders.
- To understand the function of the copper-transporting ATPase MNK.
- To correlate MNK gene mutations with disease severity and phenotypes.
Main Methods:
- Gene identification and characterization of the MNK gene.
- Cellular localization studies of the MNK protein (trans-Golgi compartment).
- Analysis of MNK gene mutations in patients and mouse models.
Main Results:
- The MNK gene encodes a copper-transporting ATPase involved in copper efflux from cells.
- MNK is localized in the trans-Golgi compartment.
- Copper-resistant cells overexpress MNK, enhancing copper efflux.
- Mutations in the MNK gene correlate with varying disease severities, from fetal lethality in mice to milder phenotypes in humans.
Conclusions:
- MNK protein plays a critical role in cellular copper transport and homeostasis.
- Defects in MNK function lead to Menkes syndrome and related copper deficiency disorders.
- Understanding MNK's role provides insights into the molecular basis of copper metabolism.