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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1988 May;85(10):3531–3534. doi: 10.1073/pnas.85.10.3531

Lack of complementation in somatic cell hybrids between fibroblasts from patients with different forms of cystinosis.

O L Pellett 1, M L Smith 1, A A Greene 1, J A Schneider 1
PMCID: PMC280246  PMID: 3368464

Abstract

Cystinosis is an autosomal recessive disease in which three clinical forms are recognized: infantile nephropathic, with renal tubular damage by 1 year of age and progressive glomerular insufficiency; intermediate, with tubular and glomerular insufficiency beginning at a later age; benign, with no kidney damage. Skin fibroblasts cultured from patients with all types of cystinosis show increased intralysosomal free (nonprotein) cystine; however, fibroblasts from heterozygotes have normal free-cystine values. To determine whether genetic complementation occurs between the different forms, somatic cell hybrids were constructed between cells from a patient with infantile nephropathic cystinosis and cells from patients with other types of cystinosis. If complementation occurred, the hybrids would be expected to have normal cystine levels. To construct hybrid cells, a "universal parent" cell type (TG1-neo), which was hypoxanthine/aminopterin/thymidine (HAT) sensitive and G418 resistant was constructed from an infantile nephropathic cystinosis fibroblast strain. Polyethylene glycol fusion of TG1-neo with other cells that are not HAT sensitive or G418 resistant allowed for selection of hybrid cells in a medium containing HAT and the aminoglycoside G418. As indicated by elevated cystine levels, complementation did not occur between TG1-neo and two different benign cystinosis strains, an intermediate cystinosis strain, or another nephropathic cystinosis cell strain. When a normal fibroblast strain was fused with TG1-neo, all 15 hybrid clones studied contained normal amounts of intracellular free cystine.

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Selected References

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