Abstract:
:The gene for X-linked agammaglobulinemia (XLA) has been mapped to Xq22. No recombinations have been reported between the gene and the probe p212 at DXS178; however, this probe is informative in only 30-40% of women and the reported flanking markers, DXS3 and DXS94, are 10-15 cM apart. To identify additional probes that might be useful in genetic counseling, we examined 11 polymorphisms that have been mapped to the Xq21.3-q22 region in 13 families with XLA. In addition, pulsed-field gel electrophoresis and yeast artificial chromosomes (YACs) were used to further characterize the segment of DNA within which the gene for XLA must lie. The results demonstrated that DXS366 and DXS442, which share a 430-kb pulsed-field fragment, could replace DXS3 as proximal flanking markers. Probes at DXS178 and DXS265 identified the same 145-kb pulsed-field fragment, and both loci were contained within a 200-kb YAC identified with the probe p212. A highly polymorphic CA repeat (DXS178CA) was isolated from one end of this YAC and used in linkage analysis. Probes at DXS101 and DXS328 shared several pulsed-field fragments, the smallest of which was 250 kb. No recombinations were seen between XLA and the DXS178-DXS265-DXS178CA complex, DXS101, DXS328, DXS87, or the gene for proteolipid protein (PLP). Key crossovers, when combined with the linkage data from families with Alport syndrome, suggested the following order of loci: cen-DXS3-DXS366-DXS442-(PLP, DXS101, DXS328, DXS178-DXS265-DXS178CA complex, XLA)-(DXS87, DXS94)-DXS327-(DXS350, DXS362)-tel.(ABSTRACT TRUNCATED AT 250 WORDS)
journal_name
Genomicsjournal_title
Genomicsauthors
Parolini O,Hejtmancik JF,Allen RC,Belmont JW,Lassiter GL,Henry MJ,Barker DF,Conley MEdoi
10.1006/geno.1993.1066subject
Has Abstractpub_date
1993-02-01 00:00:00pages
342-9issue
2eissn
0888-7543issn
1089-8646pii
S0888-7543(83)71066-9journal_volume
15pub_type
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