Ten families with fragile X syndrome: linkage relationships with four DNA probes from distal Xq

✍ Scribed by Julie A. Buchanan; Karin E. Buckton; Christine M. Gosden; Marjorie S. Newton; John F. Clayton; Sheila Christie; Nicholas Hastie

• Book ID: 104704736
• Publisher: Springer
• Year: 1987
• Tongue: English
• Weight: 728 KB
• Volume: 76
• Category: Article
• ISSN: 0340-6717
• DOI: 10.1007/bf00284915

✦ Synopsis

We present clinical, cytogenetic, and linkage data of four DNA probes from the terminal long arm of the X chromosome in ten new families with fragile X syndrome. A prior/posterior method of multipoint linkage analysis is employed to combine these results with published data to refine the linkage map of terminal Xq. Ten possible probe/disease orderings were tested. The order with the greatest posterior probability (0.78) of the five loci is 52a-F9-fragile X gene-DX13-St14, although the order with reversal of the positions of 52a and F9 has a posterior probability 0.15. The mean estimates of the distances between the probes and the fragile X gene are 38 cM and 33 cM for the proximal probes 52a and F9, and 8 cM and 12 cM for the distal probes DX13 and St14. Although the current method of choice in the prenatal diagnosis and carrier detection of the fragile X syndrome remains detailed cytogenetic analysis, consideration is given to the potential role of these DNA probes, both singly and in pairs.