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PubMed · 2314321

Carcinogenic optical rotation.

D T Schiff
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Abstract

It is suggested that viral nucleic acid inserts in vulnerable regions of host cell DNA contribute to cell transformation by introducing 43 degrees of optical rotation at 425 nm, and that a carcinogenic event caused by DNA inserts and adducts is spurious electron ejection from important adenine molecules that may be far from insert/adduct sites.

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Cell Transformation, NeoplasticCell Transformation, ViralDNA, ViralModels, BiologicalSpectrometry, FluorescenceSpectrophotometryJournal Article

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D T Schiff. 1990. Carcinogenic optical rotation.. https://doi.org/10.1016/0306-9877(90)90046-h

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PubMed1992

Jumping translocations originate clonal rearrangements in SV40-transformed human fibroblasts.

A comparative study of chromosomal rearrangements occurring in 4 independent clones obtained from SV40-transformed cornea and skin human fibroblasts was performed. Rearrangements principally affect some constitutive heterochromatin and, to a lesser degree, telomeric regions. This results in multiple exchanges between a limited number of chromosome structures, i.e., in jumping translocations. Such rearrangements occur even at early passages and some of them give rise to clonal rearrangements that accumulate at late passages. This process is responsible for progressive modification of the karyotypes, principally characterized by deletion of a number of chromosome segments. Thus, clonal rearrangements are selected among many others not occurring at random. The selective pressure retaining clonal rearrangement seems to be similar for the 4 independent clones, since selection of the derivative chromosomes leads to the same imbalances, whatever the origin of the clone. This sequence of events recalls that of human solid tumors, since jumping rearrangements are generally observed in pre-malignant conditions or in low-grade malignancies, whereas clonal rearrangements leading to typical imbalances are detected in more advanced malignant tumors.

Cell Transformation, Neoplastic↗