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International Journal of Endocrinology
Volume 2013, Article ID 259189, 8 pages
http://dx.doi.org/10.1155/2013/259189
Research Article

Transient Neonatal Zinc Deficiency Caused by a Heterozygous G87R Mutation in the Zinc Transporter ZnT-2 (SLC30A2) Gene in the Mother Highlighting the Importance of Zn2+ for Normal Growth and Development

1Division of Paediatric Endocrinology, Diabetology and Metabolism and Department of Clinical Research, University Children’s Hospital, Inselspital, 3010 Bern, Switzerland
2Department of Dermatology, University of Bern, 3010 Bern, Switzerland

Received 12 June 2013; Revised 7 August 2013; Accepted 22 August 2013

Academic Editor: Fabio Buzi

Copyright © 2013 Maria Consolata Miletta et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Suboptimal dietary zinc (Zn2+) intake is increasingly appreciated as an important public health issue. Zn2+ is an essential mineral, and infants are particularly vulnerable to Zn2+ deficiency, as they require large amounts of Zn2+ for their normal growth and development. Although term infants are born with an important hepatic Zn2+ storage, adequate Zn2+ nutrition of infants mostly depends on breast milk or formula feeding, which contains an adequate amount of Zn2+ to meet the infants’ requirements. An exclusively breast-fed 6 months old infant suffering from Zn2+ deficiency caused by an autosomal dominant negative G87R mutation in the Slc30a2 gene (encoding for the zinc transporter 2 (ZnT-2)) in the mother is reported. More than 20 zinc transporters characterized up to date, classified into two families (Slc30a/ZnT and Slc39a/Zip), reflect the complexity and importance of maintaining cellular Zn2+ homeostasis and dynamics. The role of ZnTs is to reduce intracellular Zn2+ by transporting it from the cytoplasm into various intracellular organelles and by moving Zn2+ into extracellular space. Zips increase intracellular Zn2+ by transporting it in the opposite direction. Thus the coordinated action of both is essential for the maintenance of Zn2+ homeostasis in the cytoplasm, and accumulating evidence suggests that this is also true for the secretory pathway of growth hormone.