Abstract
Pre-adipocyte factor-1 (pref-1), originally identified in mouse 3T3-L1 pre-adipocytes, is known to play a key role in inhibiting the adipose conversion. As a first step to study the involvement of the PREF1 gene in intramuscular adipose tissue development in cattle, which has an economic importance for beef cattle, we have isolated the bovine PREF1 cDNA and genomic clones and characterized expression in abdominal adipose and promoter region of the bovine PREF1 gene. We have detected two bovine PREF1 splice-isoforms, PREF1C2 and PREF1A, in abdominal fat tissue. The RT-PCR experiment revealed that the two isoforms are identified in neonatal, but no in adult abdominal fat tissue, suggesting age-dependent suppression of the bovine PREF1 gene expression in the form of PREF1C2 and PREF1A in abdominal fat tissue. By mapping the regulatory region of this gene, we have shown that at least two regions within 1121 bp upstream of putative transcription start site are sufficient to confer promoter activity, when accompanied by a short region including the transcription start site. The chromosomal location of the PREF1 gene was determined by fluorescence in situ hybridization (FISH). The PREF1 gene locates on bovine chromosome 21q24.
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