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We have detected restriction fragment length polymorphisms associated with the immunoglobulin heavy chain C gamma genes. DNA from both parents of an individual having an unbalanced rearrangement of the long arm of chromosome 14, region q32 [Cox, D. W., Markovic, V. D. &amp; Teshima, I. E. (1982) Nature (London) 297, 428-430], revealed distinctive patterns of BamHI fragments which hybridized with cloned probes from the C gamma 2-C gamma 4 gene cluster. The number of hybridizing fragments in both cases (five) equaled the number of known C gamma genes. Pedigree and densitometric analyses indicated that the proband did not have any maternal complement of C gamma gene-hybridizing fragments. Included on the deleted chromosomal segment was a C gamma gene having properties of the previously reported C gamma pseudogene. We also examined DNA from this family with a probe for the highly polymorphic locus D14S1, which recently was demonstrated to be tightly linked to the C gamma 1 gene locus [Balazs, I., Purrello, M., Rubinstein, P., Alhadeff, B. &amp; Siniscalco, M. (1982) Proc. Natl. Acad. Sci. USA 79, 7395-7399]. EcoRI and EcoRI-BamHI fragments from both parents hybridized with a probe for this locus in DNA from the proband, indicating that, unlike the C gamma gene family, D14S1 was not deleted from the abnormal chromosome. Thus, the chromosomal breakpoint in the proband lies within region 14q32 between the two tightly linked markers, D14S1 and the C gamma 1 heavy chain gene locus. The D14S1 locus must lie proximal to the centromere relative to the C gamma gene family. The genetic variability detected with C gamma gene probes may prove useful for genetic analysis of structural rearrangements involving this region of chromosome 14.

Analysis of a break in chromosome 14 mapping to the region of the immunoglobulin heavy chain locus.