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PubMed · 16151003

A human-specific gene in microglia.

Toshiyuki Hayakawa·Takashi Angata·Amanda L Lewis·Tarjei S Mikkelsen·Nissi M Varki·Ajit Varki
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Abstract

Recent studies have shown multiple differences between humans and apes in sialic acid (Sia) biology, including Siglecs (Sia-recognizing-Ig-superfamily lectins). Comparisons with the chimpanzee genome indicate that human SIGLEC11 emerged through human-specific gene conversion by an adjacent pseudogene. Conversion involved 5 cent untranslated sequences and the Sia-recognition domain. This human protein shows reduced binding relative to the ancestral form but recognizes oligosialic acids, which are enriched in the brain. SIGLEC11 is expressed in human but not in chimpanzee brain microglia. Further studies will determine if this event was related to the evolution of Homo.

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AnimalsBiological EvolutionBrainExonsGene ConversionHumansLectinsMembrane ProteinsMicrogliaPan troglodytesPhylogenyPongo pygmaeusPseudogenesRegulatory Sequences, Nucleic AcidSialic AcidsJournal ArticleResearch Support, N.I.H., ExtramuralResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.

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Toshiyuki Hayakawa, Takashi Angata, Amanda L Lewis, Tarjei S Mikkelsen, Nissi M Varki, Ajit Varki. 2005-09-09. A human-specific gene in microglia.. https://doi.org/10.1126/science.1114321

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