Transition Protein 2 (TNP2)

TNP2 were not found in human testicular RNA or human testis cDNA libraries. Finding homologous sequences in the human genome was greatly facilitated, however, by the finding that, in the boar and bull genomes, the genes for protamine-1 (PRM1) and Prm2 are clustered with Tnp2. Schluter et al. (1992) tested a genomic human cosmid clone containing the genes for both protamines and found that the TNP2 gene was within a distance of 7.5 kb 3-prime of the PRM2 gene. The gene was transcribed in human testicular RNA only at a level demonstrable by RT-PCR and RNase protection assay. In contrast to the TNP2 genes of mouse, rat, boar, and bull, the human TNP2 gene lacks the nucleotide sequence GCCATCAC in its 3-prime UTR.