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Human Molecular Genetics, Vol 6, 1087-1089, Copyright © 1997 by Oxford University Press

ARTICLES

Mutations in the Chediak-Higashi syndrome gene (CHS1) indicate requirement for the complete 3801 amino acid CHS protein

MA Karim, DL Nagle, HH Kandil, J Burger, KJ Moore and RA Spritz
Department of Medical Genetics, University of Wisconsin, Madison 53706, USA.

Chediak-Higashi syndrome (CHS) is a rare, usually fatal, autosomal recessive disorder characterized by severe immunologic defects, reduced pigmentation, progressive neurologic dysfunction and a bleeding diathesis. The hallmark of CHS is giant organelles and giant granules in many different cell types, most likely the result of defective trafficking of specific organellar and granular proteins necessary for the normal genesis, structure or function of these cytoplasmic components. The CHS1 gene has recently been identified and shown to be homologous to the beige locus of the mouse; however, there has been disagreement as to the length of the functional CHS1 mRNA and protein. Here we report homozygous CHS1 gene mutations in two of the original probands we used to map the gene to 1q42-q44. One of these, a frameshift at codon 3197, supports our assertion that the functional CHS protein is a predicted 3801 amino acid polypeptide encoded by a 13.5 kb mRNA.
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