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Mol Cell Biol. 1993 October; 13(10): 6024-6035

Alternative splicing of Pax-8 gene transcripts is developmentally regulated and generates isoforms with different transactivation properties.

Z Kozmik, R Kurzbauer, P Dörfler and M Busslinger

Research Institute of Molecular Pathology, Vienna, Austria.

ABSTRACT

Pax-8, a member of the paired box-containing gene family, was shown to be coexpressed with Pax-2 in several human kidney carcinoma cell lines. Four different Pax-8 mRNA isoforms, a to d, were cloned from one of these cell lines by polymerase chain reaction amplification, and the Pax-8 gene was isolated from a human cosmid library. Analysis of the exon-intron structure of Pax-8 revealed that the four mRNA isoforms arise by alternative splicing, resulting in inclusion or exclusion of exon 7 and/or exon 8 sequences. All four Pax-8 proteins retain the paired domain as their DNA-binding motif and recognize DNA in the same manner as do the closely related Pax-2 and BSAP (Pax-5) proteins. The Pax-8a and Pax-8b isoforms end in a serine/threonine/tyrosine-rich sequence, while the C terminus of Pax-8c and Pax-8d is translated in a different, proline-rich reading frame. Transient transfection experiments revealed that Pax-8 isoforms a and b, but not c and d, strongly stimulate transcription from a promoter containing six copies of a paired-domain recognition sequence. The same four mRNA variants were also detected by RNase protection analysis in the mouse embryo and adult kidney, thus indicating evolutionary conservation of Pax-8 mRNA splicing. A different splice pattern was observed in the developing placenta, which expresses two new variants, Pax-8e and Pax-8f, instead of transcripts b to d. Expression of these mRNAs is high at embryonic day 9.5 and is gradually reduced until Pax-8a is the predominant transcript in the 12.5-day placenta. In the embryo, however, the synthesis of mRNAs b to d is initially low and then increases relative to that of Pax-8a. Hence, alternative splicing of Pax-8 gene transcripts not only generates six different Pax-8 variants but is also temporally and spatially regulated during early mouse development.

Mol Cell Biol. 1993 October; 13(10): 6024-6035




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