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Genetic Heterogeneity in Heterocellular Hereditary Persistence of Fetal Hemoglobin
J.E. Craig,
J. Rochette,
M. Sampietro,
A.O.M. Wilkie,
R. Barnetson,
C.S.R. Hatton,
F. Demenais, and
S.L. Thein
From the MRC Molecular Hematology Unit and the Department of Clinical Genetics, Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford, UK; Department of Obstetrics and Gynaecology, The University of Adelaide, The Queen Elizabeth Hospital, Adelaide, South Australia, Pediatrie I et Genetique Moleculaire, Centre Hospitale-Universitaire (CHU) Amiens, Amiens, France; Istituto di Medicina Interna e Fisiopatologia Medica, Università di Milano, IRCCS Ospedale Maggiore, Milano, Italy; Department of Hematology, Wexham Park Hospital, Slough, UK; and Institut National de la Sante et de la Recherhe Medicale (INSERM) U358, Hôpital Saint-Louis, Paris, France.
A large English pedigree in which heterocellular hereditary persistence of fetal hemoglobin (HPFH) segregates is described.  -globin cluster deletions and  gene promoter mutations associated with HPFH have been excluded. Of particular importance in this pedigree is the absence of any cosegregating hemoglobinopathy, thus allowing observation of the segregation pattern of this form of HPFH without the complicating effect of a -globin gene mutation. Information gained in this study confirms that the extent of elevation of hemoglobin (Hb) F and F cells varies between affected individuals. There are one example of incomplete penetrance and three examples of father-to-son transmission, thus excluding X-linked inheritance. Consistent with previous reports, the most likely mode of inheritance is autosomal codominant. Linkage studies using a -globin cluster microsatellite show no evidence of linkage to this chromosomal region implicating the presence of trans-acting regulatory factor(s). We have recently mapped one such locus to the chromosome 6q region in a very large Asian-Indian pedigree. Linkage to chromosome 6q in the English pedigree was excluded, thus indicating the presence of genetic heterogeneity in heterocellular HPFH.
Blood, Vol. 90 No. 1 (July 1), 1997:
pp. 428-434
© 1997 by The American Society of Hematology.
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