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Cloning, sequencing, characterization, and expressions of divalent metal transporter one in the small intestine of broilers.

Poult. Sci.2008 Apr;87(4):768-76
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摘要


Divalent metal transporter 1 (DMT1) is an electrogenic transporter of divalent Mn that is expressed at a high level on the brush-border membrane of enterocytes. This study is the first reported isolation of the 2 full-length cDNA sequences of the small intestinal DMT1 gene of broilers by rapid amplification of cDNA ends. The chicken DMT1 isoform I cDNA was 1,972 bp and contained a 1,695-bp open reading frame encoding a 564-amino acid protein, and the chicken DMT1 isoform II cDNA was 1,775 bp and contained a 1,593-bp open reading frame encoding a 530-amino acid protein. The 2 chicken DMT1 isoform transcripts differed in their 3'-translated regions and untranslated regions. The identities of the amino acid sequence deduced from the full-length cDNA sequence of the chicken DMT1 isoform I with DMT1 not containing the iron-responsive element of the mouse, rat, and human were 82, 82, and 80%, respectively. The identities of the amino acid sequence deduced from the full-length cDNA sequence of the chicken DMT1 isoform II with those of the mouse, rat, and human were 84, 84, and 83%, respectively. Analyses of hydrophobicity, transmembrane region, and signal peptides of DMT1 proteins deduced by nucleotide sequences suggested that chicken DMT1 isoforms are transmembrane proteins with several conserved peptide sequences, such as N-linked glycosylation signals (N-X-S/ T, where X designates any amino acid) and the consensus transport motif. The total mRNA levels of the 2 chicken DMT1 isoforms, the mRNA levels of chicken DMT1 isoform I, and the mRNA levels of chicken DMT1 isoform II in the duodenum and jejunum were higher (P<0.002) than that in the ileum by real-time reverse transcription PCR assay. There was no significant difference (P>0.26) between the duodenum and jejunum for the above 3 indices. The mRNA level of the chicken DMT1 isoform I was higher (P<0.001) than that of the chicken DMT1 isoform II in each small intestinal segment of Mn-deficient broilers.

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