16 resultados para Loneliness and isolation
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Resumo:
Molecular events involved in specification of early hematopoietic system are not well known. In Xenopus, a paired-box homeodomain family (Mix.1–4) has been implicated in this process. Although Mix-like homeobox genes have been isolated from zebrafish (bon), chicken (CMIX) and mice (MmI/MIXL1), isolation of a human Mix-like gene has remained elusive. ^ We have recently isolated and characterized a novel human Mix-like homeobox gene with a predicted open reading frame of 232 amino acids designated the Mix.1 homeobox (Xenopus laevis)-like gene (MIXL). The overall identity of this novel protein to CMIX and MmI/MIXL1 is 41% and 69%, respectively. However, the identity in the homeodomain is 66% to that of Xenopus Mix.1, 79% to that of CMIX, and 94% to that of MmI/MIXL1. In normal hematopoiesis, MIXL expression appears to be restricted immature B and T lymphoid cells. Several acute leukemic cell lines of B, T and myeloid lineages express MIXL suggesting a survival/block in differentiation advantage. Furthermore, Xenopus animal cap assay revealed that MIXL could induce expression of the α-globin gene, suggesting a functional conservation of the homeodomain. ^ Biochemical analysis revealed that MIXL proteins are phosphorylated at multiple sites. Immunoprecipitation and immunoblotting confirmed that MIXL is tyrosine phosphorylated. Mutational analysis determined that Tyr20 appears to be the site for phosphorylation. However, deletion analysis preliminarily showed that the proline-rich domain appears not to be necessary for tyrosine phosphorylation. The novel finding will help us make a deeper understanding of the regulation on homeodomain proteins by rarely reported tyrosine phosphorylation. ^ Taken together, isolation of the MIXL gene is the first step toward understanding novel regulatory circuits in early hematopoietic differentiation and malignant transformation. ^