Summary
Two cases of primary ring chromosome 2 and one case of a ring secondary to a paternal 2/6 translocation are described and compared with a fourth case of ring 2 from the literature. The breakpoints in two cases are identical and the same as the breakpoint on chromosome 2 in the composite 2/6 ring. The three primary rings have a number of symptoms in common, but other cases are needed to identify a possible deletion syndrome. The levels of the enzyme MDH-1 were within the normal range in Cases 1 and 2. Thus we localised the locus for MDH-1 to segment 2p23→p25; this had previously been localised to segment p23→pter.
Similar content being viewed by others
References
Bartoshesky, L., Lewis, M. B., Pashayan, H. M.: Developmental abnormalities associated with long arm deletion of chromosome No. 6. Clin. Genet. 13, 68–71 (1978)
Danesino, C., D'Azzo, A., Maraschio, P., Fraccaro, M.: The gene for human peptidase A is on band 18q23 and shows triplex and uniplex dosage effect. Hum. Genet. 43, 299–305 (1978)
Ferguson-Smith, M. A., Newman, B. F., Ellis, P. M., Thomson, D. M. G.: Assignment by deletion of human red cell acid phosphatase gene locus to the short arm of chromosome 2. Nature New Biol. 243, 271–274 (1973)
Fryns, J. P., De Boeck, K., Jaeken, J., Van den Berghe, H.: Malformative syndrome associated with a ring 10 chromosome and a translocated 10q/19 chromosome. Hum. Genet. 43, 239–244 (1978)
Garau, A., Crisponi, G., Cossu, P.: In tema di patologia autosomica:sindrome plurimalformativa con cromosoma ad anello del gruppo A. Clinica Pediatr. (Parma) 55, 84–95 (1973)
Genest, P., Leclerc, R., Auger, C.: Ring chromosome and partial translocation in the same cell. Lancet 1963I, 1426–1427
Grouchy, J. de, Turleau, C.: Atlas des maladies chromosomiques. Paris: Expansion Scientifique 1977
Hamerton, J. L., Mohandas, T., McAlpine, P. J., Douglas, G. R.: Assignment of three human gene loci to regions of chromosome 2. Cytogenet. Cell Genet. 14, 176–178 (1975)
McKusick, V. A., Ruddle, F. H.: The status of the gene map of the human chromosome. Science 196, 390–405 (1977)
Mukerjee, D., Burdette, W. J.: Multiple congenital anomalies associated with a ring 3 chromosome and translocation 3/X chromosome. Nature 212, 153–155 (1967)
Niebuhr, E.: Reexamination of a family with a t(13q14q) and a ring D(13) child. Ann. Genet. (Paris) 16, 199–202 (1973)
Shrago, E.: Cytoplasmic characteristic of human erythrocyte malic dehydrogenase. Arch. Biochem. Biophys. 109, 59–61 (1965)
Sinha, K. P., Lewis, W. H. P., Corney, G., Harris, H.: Studies on the quantitative variation of human red cell peptidase A activity. Ann. Hum. Genet. 34, 153–168 (1970)
Sutherland, G. R., Carter, R. F.: 46,XX/46,XX,r(2)(p25q37) mosaicism: Clinical and cytogenetic studies. Ann. Genet. (Paris) (in press, 1979)
Swallow, D. M., Povey, Susan, Harris, H.: Activity of the “red cell” acid phosphatase locus in other tissues. Ann. Hum. Genet. 37, 31–38 (1973)
Wang, H., Melnyk, J., McDonald, L. T., Uchida, I. A., Carr, D. H., Goldberg, B.: Ring chromosomes in human beings. Nature 195, 733–734 (1962)
Yunis, J. J.: High resolution of human chromosome. Science 191, 1268–1270 (1976)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Maraschio, P., Danesino, C., Garau, A. et al. Three cases of ring chromosome 2, one derived from a paternal 2/6 translocation. Hum Genet 48, 157–167 (1979). https://doi.org/10.1007/BF00286899
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00286899