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Human Reproduction, Vol 13, 363-369, Copyright © 1998 by Oxford University Press

ARTICLES

DAZ (Deleted in AZoospermia) genes encode proteins located in human late spermatids and in sperm tails

B Habermann, HF Mi, A Edelmann, C Bohring, IT Backert, F Kiesewetter, G Aumuller and PH Vogt
Department of Andrology, Centre of Dermatology, University of Marburg, Germany.

We analysed the location of proteins encoded by the DAZ (Deleted in AZoospermia) genes in human testis tissue and in mature spermatozoa. The DAZ genes are known to be expressed exclusively in the human male germ line, and are candidate genes for the expression of the azoospermia factor AZFc mapped recently to distal Yq11. They encode testis-specific RNA binding proteins, the function of which is not yet known. Immunostaining experiments with antibodies prepared for the specific peptide domain encoded by the DAZ2 transcript (formerly SPGY1) revealed the presence of DAZ proteins in the innermost layer of the male germ cell epithelium and in the tails of spermatozoa. This suggests a function for DAZ proteins in the RNA metabolism of late spermatids, presumably in the storage or transport of testis-specific mRNA, the translation of which is repressed until the formation of mature spermatozoa. Deletion of DAZ genes is supposed not to interfere with human sperm maturation but to result in a gradual reduction of mature spermatozoa.
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