alexa Abstract | Evolution of Vertebrate Solute Carrier Family 9B Genes and Proteins (SLC9B): Evidence for a Marsupial Origin for Testis Specific SLC9B1 from an Ancestral Vertebrate SLC9B2 Gene
ISSN: 2329-9002

Journal of Phylogenetics & Evolutionary Biology
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Research Article Open Access

Abstract

SLC9B genes and proteins are members of the sodium/lithium hydrogen antiporter family which function as solute exchangers within cellular membranes of mammalian tissues. SLC9B2 and SLC9B1 amino acid sequences and structures and SLC9B-like gene locations were examined using bioinformatic data from several vertebrate genome projects. Vertebrate SLC9B2 sequences shared 56-98% identity as compared with ~50% identities with mammalian SLC9B1 sequences. Sequence alignments, key amino acid residues and conserved predicted transmembrane structures were also studied. Mammalian SLC9B2 and SLC9B1 genes usually contained 11 or 12 coding exons with differential tissue expression patterns: SLC9B2, broad tissue distribution; and SLC9B1, being testis specific. Transcription factor binding sites and CpG islands within the human SLC9B2 and SLC9B1 gene promoters were identified. Phylogenetic analyses suggested that SLC9B1 originated in an ancestral marsupial genome from a SLC9B2 gene duplication event.

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Author(s): Roger S Holmes*, Kimberly D Spradling-Reeves and Laura A Cox

Keywords

Solute carrier, SLC9B2, SLC9B1, NHA2, NHA1, Sodium/hydrogen exchanger, Testis-specific, Transmembrane, Marsupial origin, Gene evolution, Evolutionary Genomics, Evolutionary Developmental Biology

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