Human Paralogs of KIAA0187 Were Created through Independent Pericentromeric-Directed and Chromosome-Specific Duplication Mechanisms (original) (raw)

  1. Moira Crosier1,5,
  2. Luigi Viggiano3,5,
  3. Jane Guy1,
  4. Doriana Misceo3,
  5. Robert Stones1,
  6. Wenbin Wei2,
  7. Tom Hearn1,4,
  8. Mario Ventura1,2,
  9. Nicoletta Archidiacono2,
  10. Mariano Rocchi2, and
  11. Michael S. Jackson1,6
  12. 1The Institute of Human Genetics, The International Centre for Life, and the 2Department of Computer Science, University of Newcastle Upon Tyne, Central Parkway, Newcastle Upon Tyne NE1 3BZ, United Kingdom;3DAPEG, Sezione di Genetica, Universita' di Bari, 70126 Bari, Italy

Abstract

KIAA0187 is a gene of unknown function that maps to 10q11 and has been subject to recent duplication events. Here we analyze 18 human paralogs of this gene and show that paralogs of exons 14–23 were formed through satellite-associated pericentromeric-directed duplication, whereas paralogs of exons 1–9 were created via chromosome-specific satellite-independent duplications. In silico, Northern, and RT-PCR analyses indicate that nine paralogs are transcribed, including four in which KIAA0187 exons are spliced onto novel sequences. Despite this, no new genes appear to have been created by these events. The chromosome 10 paralogs map to 10q11, 10q22, 10q23.1, and 10q23.3, forming part of a complex family of chromosome-specific repeats that includes GLUD1,Cathepsin L, and KIAA1099 pseudogenes. Phylogenetic analyses and comparative FISH indicates that the 10q23.1 and 10q23.3 repeats were created in 10q11 and relocated by a paracentric inversion 13 to 27 Myr ago. Furthermore, the most recent duplications, involving the KIAA1099 pseudogenes, have largely been confined to 10q11. These results indicate a simple model for the evolution of this repeat family, involving multiple rounds of centromere-proximal duplication and dispersal through intrachromosomal rearrangement. However, more complex events must be invoked to account for high sequence identity between some paralogs.

[The sequence data described in this paper have been submitted to the GenBank data library under accession nos. AJ298152 through AJ298168.]

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