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Maintenance of adequate telomere length in developing cells is the most important concern to preserve the integrity of the genome. The length of telomere is strictly regulated by numerous telomere-binding proteins and/or interacting factors. Even though the expression of telomerase in the male reproductive tract has been characterized, developmental expressional profiling of telomerase and other telomere-associated proteins has not been determined in detail. The present study was attempted to examine expression patterns of catalytic subunit(Tert) and RNA component(Terc) of telomerase and two telomerase associated factors, telomerase associated protein 1(Tep1) and TERF1(TRF1) interacting nuclear factor 2(Tinf2) in the testis and seminal vesicle of male rat during postnatal development. The real-time PCR analysis was utilized to quantify mRNA expression of molecules. The abundance of Tep1 mRNA in the testis and seminal vesicle was the highest at 5 months of age. Expressional fluctuation of Tinf2 during postnatal development was found in the testis, while expression of Tinf2 in the seminal vesicle was gradually increased until 5 months of age and then significantly decreased later. mRNA level of Tert gene in the testis was significantly increased at the adult and the elder, while the highest expression of Tert gene in the seminal vesicle was found at 5 months of age. Expression of Terc transcript in the testis and seminal vesicle was the highest at 5 months of age, followed by significant reduction at 1 and 2 years of ages. Such differential gene expression of telomere-associated factors and telomerase components in different male reproductive tissues during postnatal development indicates that maintenance of telomere length would be regulated in tissue- and/or age-specific manners.

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