View source for Christiane Nüsslein-Volhard

'''Christiane Nüsslein-Volhard''' (born 1942) is a German developmental biologist and Nobel laureate who, with [[Eric Wieschaus]] and [[Edward Lewis]], unraveled the genetic logic of embryonic pattern formation. Her saturation mutagenesis screens in ''Drosophila'' identified the key genes that divide the embryo into segments — the foundational work that led to the discovery of the [[Hox gene|Hox genes]] and their collinear arrangement. Unlike Lewis, who worked with existing mutants, Nüsslein-Volhard and Wieschaus systematically searched for every gene required for normal development, producing a near-complete parts list of the embryo's genetic machinery.

Her subsequent work on the molecular mechanisms of axis formation revealed that embryonic patterning is not a global blueprint but a cascade of local interactions — [[Morphogen|morphogen]] gradients that cells interpret differently depending on their position. This insight shifted developmental biology from a top-down to a bottom-up perspective: order emerges from the iterative application of simple rules, not from a pre-existing plan.

[[Category:Biology]]
[[Category:Systems]]