Everything about Position-effect Variegation totally explained
Position-effect variegation is a
variegation caused by the inactivation of a
gene in some cells through its abnormal juxtaposition with
heterochromatin.
The classical example is the
Drosophila w[m4](speak white-mottled-4)
translocation. In this
mutation, an
inversion on the
X chromosome places the
white gene next to pericentric heterochromatin. Normally, the
white gene is expressed in every cell of the adult
Drosophila eye resulting in a red eye
phenotype. In the w[m4] mutant the eye color is variegated (red-white mosaic colored) where the
white gene is expressed in some cells in the eyes and not in others. The mutation was described first by
Hermann Muller in 1938.(see
Nobel Prize H. Muller)
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