title: Molecular characterization of hiwi, a human member of the piwi gene family whose overexpression is correlated to seminomas.
abstract: The piwi family genes are highly conserved during evolution and play essential roles in stem cell self-renewal, gametogenesis, and RNA interference in diverse organisms ranging from Drosophila melanogaster and C. elegans to Arabidopsis. Here we report the molecular characterization of hiwi, a human member of the piwi gene family. hiwi maps to the long arm of chromosome 12, band 12q24.33, a genomic region that displays genetic linkage to the development of testicular germ cell tumors of adolescents and adults (TGCTs), i.e., seminomas and nonseminomas. In addition, gain of this chromosomal region has been found in some TGCTs. hiwi encodes a 3.6 kb mRNA that is expressed abundantly in the adult testis. It encodes a highly basic 861-amino-acid protein that shares significant homology throughout its entire length with other members of the PIWI family proteins in Drosophila, C. elegans and mammals. In normal human testes, hiwi is specifically expressed in germline cells, with its expression detectable in spermatocytes and round spermatids during spermatogenesis. No expresssion was observed in testicular tumors of somatic origin, such as Sertoli cell and Leydig cell tumors. Enhanced expression was found in 12 out of 19 sampled testicular seminomas-tumors originating from embryonic germ cells with retention of germ cell phenotype. In contrast, no enhanced expression was detected in 10 nonseminomas-testicular tumors that originate from the same precursor cells as seminomas yet have lost their germ cell characteristics. Finally, no enhanced expression was detected in four spermatocytic seminomas-testicular tumors that most likely originate from germ cells capable of partial meiosis. Thus, hiwi is specifically expressed in both normal and malignant spermatogenic cells in a maturation stage-dependent pattern, in which it might function in germ cell proliferation.
authors.affiliation: Department of Cell Biology, Duke University Medical Center, PO Box 3709, DUMC, Durham, North Carolina, NC 27710, USA.
authors.forename: Dan
authors.initials: D
authors.lastname: Qiao
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Zeeman
authors.forename: Wei
authors.initials: W
authors.lastname: Deng
authors.forename: Leendert H J
authors.initials: LH
authors.lastname: Looijenga
authors.forename: Haifan
authors.initials: H
authors.lastname: Lin
mesh_terms: D000595:Amino Acid Sequence; D060565:Argonaute Proteins; D015152:Blotting, Northern; D002648:Child; D002874:Chromosome Mapping; D002881:Chromosomes, Human, Pair 12 / Q000235:genetics; D003001:Cloning, Molecular; D017931:DNA Primers / Q000737:chemistry; D018076:DNA, Complementary; D029721:Drosophila Proteins; D005562:Formazans; D015723:Gene Library; D006801:Humans; D007124:Immunoenzyme Techniques; D017403:In Situ Hybridization; D008297:Male; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D011506:Proteins / Q000235:genetics* / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D034743:RNA-Induced Silencing Complex; D018239:Seminoma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D017386:Sequence Homology, Amino Acid; D013724:Teratoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D013736:Testicular Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D013778:Tetrazolium Salts
chemical_list: D060565:Argonaute Proteins; D017931:DNA Primers; D018076:DNA, Complementary; D029721:Drosophila Proteins; D005562:Formazans; C421088:PIWIL1 protein, human; D011506:Proteins; D012333:RNA, Messenger; D034743:RNA-Induced Silencing Complex; D013778:Tetrazolium Salts; C116498:piwi protein, Drosophila; C079782:MTT formazan