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Structure and expression of the chicken ferritin H-subunit gene.

ABSTRACT

Although the genomes of many species contain multiple copies of ferritin heavy (H)- and light (L)-chain sequences, the chicken genome contains only a single copy of the H-subunit gene. The primary transcription unit of this gene is 4.6 kilobase pairs and contains four exons which are posttranscriptionally spliced to generate a mature transcript of 869 nucleotides. Chicken and human ferritin H-subunit genomic loci are organized with similar exon-intron boundaries. They exhibit approximately 85% nucleotide identity in coding regions, which yield proteins 93% identical in amino acid sequence. We have identified a sequence of 22 highly conserved nucleotides in the 5' untranslated sequences of chicken, human, and tadpole ferritin H-subunit genes and propose that this conserved sequence may regulate iron-modulated translation of ferritin H-subunit mRNAs.

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