 Juliana G. Roscito

Juliana G. Roscito is a biologist whose research connects embryonic development, evolution and genomics. She earned her doctorate in developmental and evolutionary biology at the University of São Paulo in 2010 and subsequently conducted evolutionary-genomics research in Dresden. Her later work includes scientific management.^[ref]

In Digit evolution in gymnophthalmid lizards by Juliana G. Roscito and others, she and collaborators compared the skeletal patterns of tetrapod limbs across Gymnophthalmidae. They distinguished mild reductions, such as loss of a few bones within limb digits, from more extreme reductions that leave no externally distinct adult limb. The study also examined Sonic hedgehog gene expression in strongly reduced developing limbs.^[ref]

The comparison joins an adult phenotype to an embryonic process. Two animals with superficially similar limb reduction need not have changed the same developmental step. Examining which skeletal elements remain, alongside spatial gene expression, makes that question more precise than simply counting visible toes. Those observations identify patterns to explain; they do not by themselves prove that every case of limb loss has one molecular cause.