Construction of a high-resolution RH map of the human 2q35 region on TNG panel and comparison with a physical map of the porcine homologous region 15q25

Abstract.

This article describes the construction of a high-resolution radiation hybrid map of Hsap 2q35 by using the TNG RH panel generated by irradiation with 50,000 rads. We were able to build a framework map of 1300 cR_50,000 including 34 markers ordered with odds higher than 1000:1. The comprehensive map includes 77 loci and describes a region of 3 Mb around the SLC11A1 gene. Because of the very small size of the fragments retained and a reduced retention frequency, it was difficult to build a high-resolution multi-point map of this region by using the TNG RH panel. Nevertheless, this study confirmed the very high potential of this RH panel for constructing a human, high-resolution physical map (2.3 kb/cR_50,000). Moreover, human ESTs from Hsap 2q35 were hybridized with porcine BAC contigs to establish a porcine transcript map of the homologous region Sscr 15q25 (greater than 2.5 Mb). We identified 17 new genes in this porcine chromosomal region. We were able to compare the location of 26 genes mapped in both species. The gene order was similar except for two possible minor discrepancies in the Desmin sub-region, suggesting the existence of a porcine micro-region between TNP1 and IL8RB with an unknown origin.