The genes for insulin-like growth factor 1 receptor (IGF1R), aggrecan (AGC1), β2-microglobulin (B2M), and an H6-related gene have been mapped to a single chicken microchromo-some by genetic linkage analysis. In addition, a second H6-related gene was mapped to chicken macrochromosome 3. The Igf1r and Agc1 loci are syntenic on mouse Chr 7, together with Hmx3, an H6-like locus. This suggests that the H6-related locus, which maps to the chicken microchromosome in this study, is the homolog of mouse Hmx3. The IGF1R, AGC1, and B2M loci are located on human Chr 15, probably in the same order as found for this chicken microchromosome. This conserved segment, however, is not entirely conserved in the mouse and is split between Chr 7 (Igf1r-Age) and 2 (B2m). This comparison also predicts that the HMX3 locus may map to the short arm of human Chr 15. The conserved segment defined by the IGF1R-AGC1-HMX3—B2M loci is approximately 21–35 Mb in length and probably covers the entire chicken microchromosome. These results suggest that a segment of human Chr 15 has been conserved as a chicken micro-chromosome. The significance of this result is discussed with reference to the evolution of the avian and mammalian genomes.
Mammalian Genome – Springer Journals
Published: Mar 24, 2009
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