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We have isolated a cDNA encoding a novel placental lactogen (PL), PL-I mosaic (PL-Im), by screening the cDNA library in lambda ZAP of the mid-pregnant (day 12) rat placenta. The cDNA comprised an open reading frame of 687 bp encoding 229 amino acids, in which there were two putative N-glycosylation sites. Northern blot analysis showed that PL-Im mRNA was expressed specifically during mid-pregnancy (days 10 and 12) in the rat placenta. The cDNA was highly homologous with those of other rat PL family members; in particular, the homology among PL-Im, PL-I (mid-pregnancy-specific) and PL-Iv (late-pregnancy-specific) was over 90%. Interestingly, the nucleotide sequence of PL-Im cDNA was a mosaic of PL-I and PL-Iv and it did not possess its own particular sequence. As the genomic pattern determined using Southern blot analysis of PL-Im was distinct from that of PL-I and PL-Iv, the encoded area of PL-Im appears to be independent of those of PL-I and PL-Iv on the gene. In the dendrogram of the rat PL family constructed on the basis of the nucleotide sequence homologies, PL-Im was located between PL-Iv and PL-I in the process of molecular evolution. Therefore, PL-Im has a unique cDNA structure and may be a principal factor in the molecular evolution of PLs.

A cDNA Encoding a New Member of the Rat Placental Lactogen Family, PL-I mosaic (PL-Im).