title: Changes in the gamma chain heterogeneity of hemoglobin F of the baboon (Papio cynocephalus) postnatally and after partial switching to hemoglobin F production by various stimuli.
abstract: The postnatal switch from hemoglobin (Hb) F to Hb A in the baboon (Papio cynocephalus) occurs somewhat more rapidly than in humans. Minor components which are related to Hb F and Hb A are also present and show reciprocal rise and fall. The baboon produces two types of gamma chain presumably from nonallelic genes. These have either an isoleucyl (I gamma) or a valyl (V gamma) residue in position 75. As in the human case with G gamma and A gamma chains, the ratio I gamma to V gamma chains changes during the postnatal switch. Production of Hb F in the baboon may be stimulated by phenylhydrazine or more effectively by 5-azacytidine. With phenylhydrazine, the ratio of I gamma to V gamma chains in the Hb F is the same as in the traces of Hb F in the juvenile or adult baboon. However, with 5-azacytidine, at least some of the Hb F that is produced probably has been synthesized with an I gamma to V gamma ratio that is present prenatally and in the newborn baboon.
mesh_terms: D000375:Aging; D000818:Animals; D005319:Fetal Hemoglobin / Q000235:genetics* / Q000378:metabolism; D014644:Genetic Variation; D006441:Hemoglobin A / Q000378:metabolism; D046911:Macromolecular Substances; D010215:Papio / Q000254:growth & development*
chemical_list: D046911:Macromolecular Substances; D006441:Hemoglobin A; D005319:Fetal Hemoglobin