Summary
The existence of embryonic hemoglobins is demonstrated in sheep-, calf and pig embryos. The occurrence and disappearance of these hemoglobins is quantitatively determined by cellulose acetate gel electrophoresis; hemoglobins as well as the globin chains, dissociated in 8 molar urea were quantitated. Sedimentation and diffusion experiments in the analytical ultracentrifuge revealed a S20 of 4.3 and a D20 of 6.6 for the examined hemoglobins. Therefore it is concluded that all hemoglobins occurring at different stages of embryonic and fetal development consist of 4 polypeptide chains with a total molecular weight of 66,000. The subsequent formation of the different polypeptide chains during ontogenesis is shown: At first only ε-chains are formed as demonstrated by the existence of Hb Gower I, consisting of four identical ε-chains. Subsequently the α-chain appears, which leads to Hb Gower 2 (α2ε2). The third polypeptide chain formed during the ontogenesis the γ-chain results finally in the appearance of HbF.
In addition the existence of a HbF pig is demonstrated by the fingerprint technique.
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Kleihauer, E., Stöffler, G. Embryonic hemoglobins of different animal species. Molec. Gen. Genet. 101, 59–69 (1968). https://doi.org/10.1007/BF00434812
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DOI: https://doi.org/10.1007/BF00434812