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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Structure of the murine lactotransferrin gene is similar to the structure of other transferrin- encoding genes and shares a putative regulatory region with the murine myeloperoxidase gene.

The structure and nucleotide sequence of the murine lactotransferrin-encoding gene ( LTF) deduced partly by direct sequencing of genomic clones in the lambda phage vector and partly by enzymatic amplification of genomic DNA segments primed with the oligodeoxyribonucleotide primers homologous to the cDNA sequence. The lambda phage clones contained the 5' half of the gene corresponding to the first eight exons and an incomplete ninth exon interrupted by eight introns. Genomic clones corresponding to the 3' half of the LTF gene could not be obtained on repeated attempts from two different mouse genomic libraries, suggesting the possible presence of unclonable sequences in this part of the gene. Hence, PCR was used to clone the rest of the gene. Four out of the presumed eight remaining introns were cloned along with the flanking exons using PCR. Comparison of the structure of the LTF gene with those of the two other known transferrin-encoding genes, human serum transferrin-encoding gene and chicken ovotransferrin-encoding gene reveals that all three genes have a very similar intron-exon distribution pattern. The hypothesis that the present-day transferrin-encoding genes have originated from duplication of a common ancestral gene is confirmed here at the gene level. An interesting finding is the identification of a region of shared nucleotides between the 5' flanking regions of the murine LTF and myeloperoxidase-encoding genes, the two genes expressed specifically in neutrophilic granulocytes.[1]


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