Gomes C, Soh J. DnaJC18, a Novel Type III DnaJ Family Protein, is Expressed Specifically in Rat Male Germ Cells.
Dev Reprod 2017;
21:237-247. [PMID:
29082339 PMCID:
PMC5651690 DOI:
10.12717/dr.2017.21.3.237]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Revised: 09/25/2017] [Accepted: 09/26/2017] [Indexed: 11/20/2022]
Abstract
Mammalian spermatogenesis occurs in a precise and coordinated manner in the
seminiferous tubules. One of the attempts to understand the detailed biological
process during mammalian spermatogenesis at the molecular level has been to
identify the testis specific genes followed by study of the testicular
expression pattern of the genes. From the subtracted cDNA library of rat testis
prepared using representational difference analysis (RDA) method, a
complimentary DNA clone encoding type III member of a DnaJ family protein,
DnaJC18, was cloned (GenBank Accession No. DQ158861). The full-length DnaJC18
cDNA has the longest open reading frame of 357 amino acids. Tissue and
developmental Northern blot analysis revealed that the DnaJC18
gene was expressed specifically in testis and began to express from postnatal
week 4 testis, respectively. In situ hybridization studies
showed that DnaJC18 mRNA was expressed only during the
maturation stages of late pachy- tene, round and elongated spermatids of adult
rat testis. Western blot analysis with DnaJC18 antibody revealed that 41.2 kDa
DnaJC18 protein was detected only in adult testis. Immunohistochemistry study
further confirmed that DnaJC18 protein, was expressed in developing germ cells
and the result was in concert with the in situ hybridization
result. Confocal microscopy with GFP tagged DnaJC18 protein revealed that it was
localized in the cytoplasm of cells. Taken together, these results suggested
that testis specific DnaJC18, a member of the type III DnaJ protein family,
might play a role during germ cell maturation in adult rat testis.
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