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Anterior–posterior (AP) limb patterning is directed by sonic hedgehog (SHH) signaling from the posteriorly located zone of polarizing activity (ZPA). GLI3 and GLI2 are the transcriptional mediators generally utilized in SHH signaling, and each can function as an activator (A) and repressor (R). Although GLI3R has been suggested to be the primary effector of SHH signaling during limb AP patterning,...
Mosaic mutant analysis, the study of cellular defects in scattered mutant cells in a wild-type environment, is a powerful approach for identifying critical functions of genes and has been applied extensively to invertebrate model organisms. A highly versatile technique has been developed in mouse: MASTR (mosaic mutant analysis with spatial and temporal control of recombination), which utilizes the...
We examined whether Gbx2 is required after embryonic day 9 (E9) to repress Otx2 in the cerebellar anlage and position the midbrain/hindbrain organizer. In contrast to Gbx2 null mutants, mice lacking Gbx2 in rhombomere 1 (r1) after E9 (Gbx2-CKO) are viable and develop a cerebellum. A Gbx2-independent pathway can repress Otx2 in r1 after E9. Mid/hindbrain organizer gene expression, however, continues...
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