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. 1985 Mar;4(3):725–729. doi: 10.1002/j.1460-2075.1985.tb03689.x

The human genes for hemophilia A and hemophilia B flank the X chromosome fragile site at Xq27.3.

M Purrello, B Alhadeff, D Esposito, P Szabo, M Rocchi, M Truett, F Masiarz, M Siniscalco
PMCID: PMC554248  PMID: 3924593

Abstract

Two DNA recombinant clones, shown by separate studies to contain DNA sequences homologous to the genes coding for the human blood coagulation Factors VIII and IX, were hybridized in situ to metaphases or prometaphases derived from patients with the fragile-X syndrome and from a normal control. The results of these experiments indicate that (i) both genes are located in the subtelomeric region of the long arm of the human X chromosome flanking the fragile site at Xq27.3, (ii) the resolution of this localization is approximately 0.5% the length of the human haploid genome, i.e., 1.8 X 10(7) bp, (iii) the linear order of loci within the above region is Factor IX-fragile site-Factor VIII-Xqter. Both the localization and the linear order of these loci have been confirmed by Southern blotting studies using the same molecular probes and a panel of rodent-human somatic cell hybrids known to have retained different segments of the human X chromosome. The findings described herein and the knowledge that Factor IX deficiency recombines freely with at least two loci of the G6PD cluster support our hypothesis that the chromosomal region which includes the fragile-X site is normally a region of high meiotic recombination.

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Selected References

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