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Karyotype
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The cell line shares many properties with the parent tumor line including same karyology. This is a hypertriploid human cell line. The modal chromosome number is 82, occurring at 32%, with polyploidy at 8.6%. (Cells with 80 chromosome counts also occurred at a high frequency.) There were two paired [der(1)t(1;?) (p32;?), and der(11)t(2;11) (q22.1;p13)], and three to four single markers consistently found in each cell. Several other markers were also found in some cells only, including a small metacentric chromosome of unknown origin. Neither DMs nor HSRs were detected. Among the normal chromosomes, N11 had only single copy, and N1, N6, N8, N9, and N16 had two copies each. As expected, other normal chromosomes had three to four copies per cell. Two X chromosomes were generally found in each cell.
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Derivation
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Another cell line derived from the primary tumor of the same patient also is available ( ATCC CRL-1675). The WM-266-4 cell line was derived from a metastatic site of a malignant melanoma.
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Genes Expressed
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proteoglycan antigen characteristic of melanoma
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