A HIGH-RESOLUTION MAP OF GENES, MICROSATELLITE MARKERS, AND NEW DINUCLEOTIDE REPEATS FROM UBE1 TO THE GATA LOCUS IN THE REGION XP11.23
GENOMICS
Authors: KWAN, SP; HAGEMANN, TL; BLAESE, RM; ROSEN, FS
Abstract
Several new genes and markers have recently been identified on the proximal short arm of the human X chromosome in the area of Xp11.23. We had previously generated a YAC contig in this region extending from UBE1 to the OATL1 locus. In this report two polymorphic dinucleotide repeats, DXS6949 and DXS6950, were isolated and characterized from the OATL1 locus, A panel of YAC deletion derivatives from the distal portion of the contig was used in conjunction with the rest of the YAC map to position the new microsatellites and order other markers localizing to this interval. The marker order was determined to be DXS1367-ZNF81-DXS6849-ZNF21-DXS6616-DXS6950-DXS6949. In the proximal region below OATL1, we have isolated a pair of YACs from the GATA locus, B1026 and C01160. Mapping within these YACs indicates the orientation of DXS1126 and DXS1240, while a cosmid near the OATL1 region reveals the overlap between the YAC contigs from the two loci. This cosmid contains the gene respon sible for Wiskott-Aldrich syndrome (WAS) and localizes the disease gene between OATL1 and GATA, These data enable the expansion of the present physical map of the X chromosome from UBE1 to the GATA locus, covering a large portion of the Xp11.23 region, Genetic crossovers in Xp11.23 support the marker orientation and the position of WAS, contrary to previous reports, With the integration of both physical and genetic maps we have predicted the following marker order: Xpter-UBE1-SYN1/ARAF1/TIMP1-DXS1367-ZNF81-DXS6849-ZNF21-DXSy6616- (OATL1, DXS6950-DXS6949)-WAS-(GATA,DXS1126)-DXS1240-Xcen. This orientation identifies DXS6949 and DXS1126 as the nearest flanking polymorphic markers for WAS and provides useful anchor positions for the analysis of other disease genes that have been localized to this area including three differential retinal defects and X-linked nephrolithiasis. (C) 1995 Academic Press, Inc.
Spectroscopic study of the polymerization of intercalated anilinium ions in different montmorillonite clays
JOURNAL OF MOLECULAR STRUCTURE
Authors: do Nascimento, Gustavo M.; Temperini, Marcia L. A.
Abstract
The polymerization of the intercalated aniline ions was studied in three different clays, Swy2-montmorillonite (MMT), synthetic mica-montmorillonite (Synl) and pillarized Swy2-montmorillonite (PILC). PANI is formed between the MMT and Syn1 clay layers, being confirmed by the shift of d(001) peak in the X-ray pattern. X-ray Absorption near to Si K edge (Si K XANES) data show that the structures of clays are preserved after the polymerization process and in addition to the SEM images show that morphologies of the clays are maintained after polymerization, indicating no polymerization in their external surface. UV-vis-NIR and resonance Raman data display that the PANI formed in Syn1 galleries has higher amount of phenazinic rings than observed for PANI intercalated in montmorillonite (MMT) clay. No polymer formation was detected in the PILC. N K XANES and EPR spectroscopies show the presence of azo and radical nitrogen in intercalated PAN! chains. Hence, the results are rationalized considering the structural differences between the clays for understanding the role of the anilinium polymerization within the clays galleries. (C) 2011 Elsevier B.V. All rights reserved.