Interspecific genetic complementation analysis with fibroblasts from humans and four species of animals with Chediak‐Higashi syndrome

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Abstract
Although the autosomal recessive disease Chediak-Higashi syndrome (CHS) has been described in humans, cats, mink, cattle, mice, killer whales, blue foxes, and silver foxes, and these conditions appear quite similar, no direct evidence of the homology of this disease in the various species has been presented. To determine if CHS in humans, cats, mink, cattle, and mice is due to a mutant gene at the homologous genetic locus in each species, or alternatively, if these are merely similar syndromes, genetic complementa-tion analysis after interspecific somatic cell (fibroblast) hybridization was performed. “Paracrystal” formation was the criterion used for the determination of complementa-tion. The initial studies in this report were designed to characterize paracrystal formation in control and CHS fibroblasts of these five species. Most of the control fibroblasts from each species (91–96.6%) formed paracrystals upon incubation with 25 μg/ml of the microtubule depolymerizing agent vinblastine sulfate. A significantly (P < 0.05) smaller percentage of the CHS fibroblasts formed paracrystals after the same incubation (except CHS mice, with 90.2% paracrystals). It was found that 52% of the human CHS fibroblasts, 60% of cat CHS fibroblasts, 47% of mink CHS fibroblasts, and 53.8% of cow CHS fibroblasts formed paracrystals. For genetic complementation analysis, human CHS fibroblasts were fused to cat, mink, cow, or mouse CHS fibroblasts with polyethylene glycol. Control fusions were human CHS fibroblasts fused with human, cat, mink, cow, and mouse normal fibroblasts. The results of complementation analysis after the fusion of human CHS with cow CHS and human CHS with mouse CHS fibroblasts were inconclusive. A lack of complementa-tion of human CHS with cat CHS and human CHS with mink CHS fibroblasts indicates that the disease is homologous in these species.