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DNA synthesis and mitosis in fused cells. I. HeLa homokaryons 总被引:5,自引:0,他引:5
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In the Far East two types of alpha-thalassemia genes, namely alpha-thalassemia, (alpha-thal1), and alpha-thalassemia2 (alpha-thal2) exist. Definite diagnosis of the alpha-thal1 and alpha-thal2 traits is very difficult because their hematological findings are minimally abnormal or normal. This study attempts to characterize the heterozygotes by hemoglobin chain synthesis in reticulocytes from obligatory cases of the alpha-thal1 and alpha-thal2 traits. Twelve parents of babies with hemoglobin Bart's hydrops fetalis (obligatory alpha-thal1 trait) had the mean total radioactivity alpha/beta ratio of 0.76 +/- SD 0.04, while that of 7 normal controls was 1.06 +/- SD 0.04. The alpha/beta globin chain ratios of 16 cases, who were either parents or offspring of patients with hemoglobin H disease, were found to segregate into 2 groups, i.e. 0.78 +/- SD 0.03 (10 cases) and 0.9l1 and alpha-thal2 traits respectively. The hematological data of the first group showed definite hypochromic microcytic red cells, similar to those of the parents of the hydrops. The second group had significantly higher mean corpuscular hemoglobin than the first group, compatible with alpha-thal2 trait. Our globin chain synthesis study thus appears to be capable of discriminating normal, alpha-thal1 and alpha-thal2 traits. 相似文献
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Haemoglobin synthesis in human bone marrow culture 总被引:2,自引:0,他引:2
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The blood of two infants with Haemoglobin E trait and a form of -thalassaemia (Haemoglobin H Disease) was examined and it was confirmed that the proportion of Haemoglobin A:E was higher than in uncomplicated Haemoglobin E trait.Haemoglobin H (
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) was added to the haemoglobin solution from a Haemoglobin E trait carrier. This mixture was dissociated into its 2,
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subunits, and these were then recombined. The proportion of A:E had risen to that found in vivo in Haemoglobin E trait carriers with Haemoglobin H Disease.It is suggested that competition between A and E for -chains may be an example of the mechanism by which -thalassaemia interacts with -chain abnormal haemoglobins. 相似文献
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Summary One of the cell types occurring in the connective tissue of gastropods and bivalves is thepore cell. Cells of this type have a characteristic morphology in that their plasmamembrane has many invaginations bridged by cytoplasmic tongues. In the well developed granular endoplasmic reticulum and in these invaginations fine granular material, sometimes arranged in crystalline patterns, is present. InLymnaea stagnalis this material has been identified as haemocyanin on a morphological basis. Histochemical and ultrastructural results on pore cells of 2 snail species(Biomphalaria glabrata, Planorbarius corneus) having haemoglobin in their blood indicate that the pore cells in these species synthesize haemoglobin. Possible other functions of pore cells are briefly discussed. 相似文献
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Fusion of human (diploid) fibroblast monolayers with erythroblasts from 3-day chick embryos resulted in cultures containing on the average 14% heterokaryons and 8% fibroblast homokaryons. When these heterokaryon-containing cultures were labeled with radioactive amino acids during the first 24 h after fusion, the proportion of labeled proteins found in the globin region of analytical polyacrylamide gels showed a 40-fold increase compared with fibroblast homokaryons (0.08% vs. 4% of protein synthesized). Incorporation of radioactivity into globin decreased sharply during the second 24 h. Purified 35S-methionine-labeled globin from heterokaryon cultures gave rise to a tryptic fingerprint containing peptides characteristic of chick embryonic globins as late as 4 days after fusion. While fibroblasts in the fusion culture continue to go through the cell cycle normally, heterokaryons stop cycling almost completely soon after fusion. 相似文献
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Haemoglobin variants were studied in wild and laboratory house mice (Mus musculus), including standard and new inbred strains, using starch-gel electrophoretic technique. Single (Hbbs) or diffuse (Hbbd) types of haemoglobin were found in all of them. The embryonic haemoglobin pattern was different from although similar to that of the adult in all the strains. The haemoglobins revealed monomorphism in the inbred strains, while polymorphism was observed in non-inbred laboratory and wild mice. 相似文献
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Three instances of fast moving haemoglobins in heterozygous form have been found in Indian soldiers of Nepali Gorkha, during a routine screening for abnormal haemoglobins. The affected individuals were not related and seemed clinically well. 相似文献
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In clone 707 of the Friend virus-induced erythroleukaemic cell line less than 1% of the cells stain detectably for haemoglobin with benzidine. On treatment with 2% dimethylsulphoxide (DMSO) the fraction of staining cells increases to 70–80%. Line Fw has a similar origin but does not respond to DMSO although up to 7–8% of these cells stain for haemoglobin when they are grown in intraperitoneal perfusion chambers. Evidence is presented that clone 707 does not contain sub-populations of non-inducible cells nor does the Fw line contain a sub-population of inducible cells. A BUdR-resistant derivative of clone 707, designated clone 707B2/7, was isolated and shown to be incapable of incorporating 3H-thymidine. A thioguanine-resistant derivative of line Fw, designated clone FwT6/4, was also isolated and shown to be incapable of incorporating 3H-hypoxanthine. Hybrids were prepared by fusing cells of clone 707B2/7 and clone FwT6/4 in the presence of inactivated Sendai virus and selecting the hybrids in HAT medium. The properties of parental and hybrid cells were studied. The hybrids contain chromosomes from both parents and can be induced with DMSO to form an increased fraction of haemoglobinized cells. 相似文献
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The Divakar-Reese procedure has been successfully applied for transforming 7-oxo-isothiazolo[4,5-d]pyrimidine C-nucleosides (4a,b, 5a,b, 6a) via 1,2,4-triazol-1-yl intermediates (7a,b, 8a,b) into various 7-substituted C-nucleosides 15a,b, 16a,b, 17a, 18a, 19a,b, 20a,b; their subsequent deprotection provides novel types of unusual C-glycosides 22b, 23a, 24a,b, 25b, 26b. C-Nucleosides, possessing on its heterocyclic base other than naturally occuring oxo- or amino substituents, are important model compounds for biological or medicinal studies (2,3). We want to report on the synthesis of novel 7-substituted isothiazolo = [4,5-d]pyrimidine C-nucleosides. As we could show in previous papers (1,4), there exists a simple approach to the protected C-glycosides 4-6. 相似文献
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P. Fessas 《BMJ (Clinical research ed.)》1968,1(5594):764-765
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C Kattamis A Metaxotou-Mavromati E Tsiarta C Metaxatou P Wasi W G Wood L Pressley D R Higgs J B Clegg D J Weatherall 《BMJ (Clinical research ed.)》1980,281(6235):268-270
A case of haemoglobin Bart''s hydrops syndrome was characterised in a Greek family with a history of three other fetuses with hydrops. Family studies showed that both the mother and father carried alpha-thalassaemia genes, and globin-chain synthesis analysis of the present fetus showed a total absence of alpha-chain production. The haemoglobin composition of the fetus was similar to that seen in cases in south-east Asia, and analysis of DNA from the Greek case confirmed the total deletion of the alpha-chain genes. The extent of the deletion, however, differed from that seen in south-east Asian cases and included the loss of one of the embryonic zeta-chain genes. Thus the severe form of alpha-thalassaemia occurs in Greece but has arisen independently from the similar condition in south-east Asia. The condition must be considered in any woman of this racial background who gives a history of unexplained stillbirths. 相似文献
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The preparation of pyridine rings fused to the 3,4-positions of the steroid nucleus is herein described. These new pyridine derivatives were prepared in good yields by the reaction of propargylamine with 17beta-hydroxyandrost-4-en-3-one, 17alpha-methyl-17beta-hydroxyandrost-4-en-3-one, 17beta-hydroxyestr-4-en-3-one catalyzed by Cu(II). The structure of 17beta-hydroxy-5-ene-androst-3-eno[3,4-b]pyridine was determined by X-ray analysis. 相似文献