The dominant lethal effect of dietary triethylenemelamine

Hastings, Sharronn E.; Huffman, Kenneth W.; Gallo, Michael A.

doi:10.1016/0165-1218(76)90035-5

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Comparison of somatic and germ cell models for cytogenetic screening

Holden

1982

J of Applied Toxicology

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A variety of in vivo mammalian test models are available for screening of chemicals for mutagenicity at the chromosomal level. These models have been grouped into those focusing on somatic cell effects and those dealing with germ cell effects. An analysis of available literature indicates that 76 compounds have been tested from chromosome effects in both somatic and germ cells. Of these, concordant results (positive-positive or negative-negative) were obtained with 58 compounds. Of the remaining 18 compounds with discordant results, all were positive in somatic cells, but negative in germ cell assays. These results suggest an inherent relative insensitivity of germ cells themselves to mutagenic chemicals. In the context of screening for safety evaluation purposes, this analysis suggests that a negative somatic-cell response can be taken as highly predictive of negative results in a germ cell assessment.

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