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The Drosophila melanogaster genome has six physically clustered NK-related homeobox genes in just 180 kb. Here we show that the NK homeobox gene cluster was an ancient feature of bilaterian animal genomes, but has been secondarily split in chordate ancestry. The NK homeobox gene clusters of amphioxus and vertebrates are each split and dispersed at two equivalent intergenic positions. From the ancestral NK gene cluster, only the Tlx-Lbx and NK3-NK4 linkages have been retained in chordates. This evolutionary pattern is in marked contrast to the Hox and ParaHox gene clusters, which are compact in amphioxus and vertebrates, but have been disrupted in Drosophila.

Original publication

DOI

10.1073/pnas.0836141100

Type

Journal article

Journal

Proc Natl Acad Sci U S A

Publication Date

29/04/2003

Volume

100

Pages

5292 - 5295

Keywords

Amino Acid Sequence, Animals, Chordata, Nonvertebrate, Cloning, Molecular, Genes, Homeobox, Humans, In Situ Hybridization, Fluorescence, Molecular Sequence Data, Multigene Family, Sequence Homology, Amino Acid