Rabbit Anti-Human RING1 Polyclonal Antibody

A contig of cosmids containing the Ring1, Ring2, Ke6, Ke4, Rxrb, and Col11a2 genes in the rat major histocompatibility complex has been established and aligned to the class II cluster (RT1.Hb). The relative order and the transcriptional orientations of these rat genes are the same as in their human and mouse homologues. The distances are also similar, except for the Col11a2 - class II interval, which is clearly shorter in rat and mouse compared with human. The previously defined Ke5 probe could be shown to map into the large Col11a2 gene.

In mammals, totipotent embryos are formed by fusion of highly differentiated gametes. Acquisition of totipotency concurs with chromatin remodeling of parental genomes, changes in the maternal transcriptome and proteome, and zygotic genome activation (ZGA). The inefficiency of reprogramming somatic nuclei in reproductive cloning suggests that intergenerational inheritance of germline chromatin contributes to developmental proficiency after natural conception. Here we show that Ring1 and Rnf2, components of Polycomb-repressive complex 1 (PRC1), serve redundant transcriptional functions during oogenesis that are essential for proper ZGA, replication and cell cycle progression in early embryos, and development beyond the two-cell stage. Exchange of chromosomes between control and Ring1/Rnf2-deficient metaphase II oocytes reveal cytoplasmic and chromosome-based contributions by PRC1 to embryonic development. Our results strongly support a model in which Polycomb acts in the female germline to establish developmental competence for the following generation by silencing differentiation-inducing genes and defining appropriate chromatin states.