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A cDNA clone overexpressed and amplified in a mouse teratocarcinoma line.

We have constructed a cDNA library in lamda gtl 1 from undifferentiated ECAI cells, a subline of PCC4 Azal mouse teratocarcinoma cells (1). A cDNA, designated ECA39, was isolated which was expressed at a high level in undifferentiated ECAl cells and in PCC4 Azal cells. Upon differentiation ofthese cells, expression of ECA39 decreased dramatically. ECA39 was amplified 5 fold in ECAI cells and in PCC4 Azal cells, but not in F9 cells (data not shown). The magnitude of the amplification was similar to that of the k-ras oncogene in these cell lines (2). Weak expression of ECA39 was detected in brain and kidney of adult mice (data not shown). Sequencing of ECA39 cDNA from both strands revealed a 2453 nucleotide sequence with a coding capacity for a polypeptide of 280 amino acids. The search of the EMBL Gene Data Bank indicated that the sequence had a partial homology to E. coli transaminase.