Evaluation of the Tosoh HLC-723GHb V A1c 2.2 hemoglobin A1c analyzer.
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Automation↗
Biomedical subjects
M Chauffert
Publications and source records attributed to M Chauffert.
Uremia and HbA1c measured by high-performance liquid chromatography.
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Chromatography, High Pressure Liquid↗
[HLA-markers and diabetic retinopathy in the Senegalese population].
Patients with IDDM often develop severe forms of retinopathy, supposed to be associated to risk factors such as hypertension, poor glycemic control and nephropathy. A controversial intervention of a genetic marker was evoked so as some diabetic patients have retinopathy in the absence of known risk factors. HLA-DR and DQ markers were compared in two groups of patients with IDDM respectively constituted of patients with and without severe retinopathy. HLA typing was carried out by polymerase chain reaction (PCR) and restriction fragments of length polymorphism (RFLP). DR9 (p < 10(-4); O.R. = 8.36) and DQA1*0301 (p < 0.05; O.R = 2.92) alleles were positively associated to diabetic retinopathy, at the opposite of DR3 (p < 10(-3); O.R: 0.01) and DQA1* (p < 10(-9); O.R = 0.15). Furthermore, among the genotypes previously considered as risk markers of IDDM in senegalese people, only DR4: DQA1*0301:DQB1*0302/DR9: DQA1*0301: DQB1*0201 was often observed in retinopathy.
Adolescent↗
[Insulin-dependent diabetes in Senegal: HLA-DR combinations according to age of onset and sex].
In insulin-dependent diabetes mellitus, HLA-DR markers are involved, namely DR3, DR4 and DR9 alleles, among black senegalese populations. Studying the different associations of these alleles showed a strong predisposition to insulin-dependent diabetes mellitus with DR3/4 (p > 10(-2); OR = 13.6); DR4/9 (p < 10(-2); OR = 8.32) and DR9/9 (p < 0.05; OR = 7.78). And then it was observed a tendency to an inverse relationship of DR3/4 frequency with age of onset in male patients.
Adolescent↗
DNA polymorphisms of apolipoprotein B in the population of Senegal.
Three apolipoprotein B (apoB) genetic polymorphisms, the XbaI, MspI and EcoRI restriction fragment length polymorphisms (RFLPs), were analysed for 221 individuals in Senegal by polymerase chain reaction. Allelic frequency determination revealed that this population has 0.79 XbaI- (X-), 0.96 MspI+ (M+), and 0.89 EcoRI+ (E+). Major genotypes were X-/X- (0.62), M+/M+ (0.92) and E+/E+ (0.80). The XbaI allele frequency is different (p < 10(-9)) from that in Caucasians (0.47) and from that in Mongoloids (0.98). Significant differences between Senegalese and Caucasians, and between Senegalese and Mongoloids were also observed for the EcoRI and MspI alleles of the apoB genes.
Apolipoproteins B↗
Susceptibility to type 1 diabetes in the Senegalese population is linked to HLA-DQ and not TAP and LMP genes.
OBJECTIVE: To investigate the frequency of the transporter associated with antigen processing (TAP) and large multifunctional protease (LMP) alleles and their role in the susceptibility to type 1 diabetes, in comparison with the well-known HLA-DQ alleles susceptibility, in Senegalese subjects. RESEARCH DESIGN AND METHODS: Three loci in the TAP/LMP region were analyzed in 92 type 1 diabetic subjects and 117 nondiabetic control subjects by means of polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). RESULTS: No association was found between the studied polymorphisms of TAP1, TAP2, and LMP2 and type 1 diabetes in the Senegalese population, in contrast to the HLA-DQA1 and DQB1 genes, which were associated with type 1 diabetes. CONCLUSIONS: Diabetogenic genes in the class II HLA region are located near the DQA1 and DQB1 loci rather than the TAP and LMP loci.
ATP-Binding Cassette Transporters↗
[Contribution of plasma C-peptide to the classification of sugar diabetes in Dakar, Senegal].
When diabetes has been diagnosed, its classification into different types is traditionally carried out according to clinical criteria. But with arising of new parameters, one of which is C-peptide, and various subtypes of diabetes, it became more difficult. So, in order to improve the accuracy of the classification, 270 diabetic patients and 269 controls, all black senegalese subjects, were submitted to a two-step oral glucose tolerance test (0 and 120 min.) with determination of plasma glucose and C-peptide concentrations. The majority of NIDDM were confirmed at the opposite of IDDM; furthermore, it has been pointed out a group corresponding with impaired glucose tolerance (IGT) among the initial controls. When comparing the two classification modes, before and after plasma C-peptide determination, it appeared statistically significant differences with p values of 10(-4) for both IDDM and NIDDM.
Adult↗
Distribution of HLA-DQA1 and -DQB1 alleles and DQA1-DQB1 genotypes among Senegalese patients with insulin-dependent diabetes mellitus.
Transracial analysis is one method for distinguishing primary associations between insulin-dependent diabetes mellitus (IDDM) and HLA II alleles from those related to linkage disequilibrium. Black people have different DR-DQ relationships from other races and are a useful group to investigate HLA-D regions associated with IDDM. In this study, we compared the frequencies of HLA-DQA1 and DQB1 alleles in Senegalese IDDM and control subjects. DQA1*0301 was positively associated with insulin-dependent diabetes mellitus (p < 10(-9), OR 5.21), as were DQB1*0201 and *0302 (p < 10(-7) OR = 3.55, p < 10(-3) OR = 3.20, respectively). The positive associations with DQA1*0301, DQB1*0201 and DQB1*0302 are consistent with all racial groups investigated. However, taken together, the data in Senegalese population show that susceptibility and resistance to IDDM are associated both with particular haplotypes and DQA1-DQB1 heterodimers.
Adolescent↗
[HLA-DR:DQ genotypes and insulin-dependent diabetes in Senegal].
At the opposite of HLA-DR, HLA-DQ was not well documented in homogeneous negroïd populations. So, 93 IDDM and 115 control patients, all black senegalese people, were studied. The results showed three HLA-DQ IDDM-related susceptibility genotypes and also a high risk conferred by HLA-DR4/DR9 usually described in Mongoloïd people. Furthermore, DR:DQ associations allowed the identification of three IDDM predisposition genotypes, each of them with a characteristic mean age for disease diagnosis.
Adult↗
HLA-DQ beta 1 typing and non-Asp57 alleles in the aborigine population of Senegal.
OBJECTIVE: To investigate, in Senegalese subjects, the frequency of human leukocyte antigen (HLA)-DQ beta 1 alleles and their role in susceptibility to insulin-dependent diabetes mellitus (IDDM). RESEARCH DESIGN AND METHODS: HLA-DQ beta 1 typing was done in 55 IDDM subjects and 118 nondiabetic control subjects by means of polymerase chain reaction restriction fragment length polymorphism. RESULTS: Alleles bearing a codon for an Asp residue at position 57 in the DQ beta-chain were associated with a significantly lower risk of IDDM. Alleles 0201 and 0302 (Ala57) were positively associated with diabetes, but allele 0501 (Val57) was less frequent in IDDM subjects than in control subjects. CONCLUSIONS: HLA-DQ beta 1 alleles may be genetic susceptibility markers for IDDM in the Senegalese population, as they are in Caucasian populations.
Adolescent↗
Deficient induction of sulfobromophthalein conjugating activity by phenobarbital in hamster liver.
Administration of phenobarbital, a known inducer of glutathione S-transferase activity in rat liver, failed to stimulate sulfobromophthalein (BSP) conjugation by liver cytosol in hamsters. The latter displayed poor ability to conjugate this substrate, despite very high glutathione-conjugating activity with the broad-spectrum substrate 1-chloro-2,4-dinitrobenzene (CDNB). Of the six substrates tested, in this species, 1,2-epoxy-3-(4-nitrophenoxy)propane (ENPP) was the only one whose conjugation was greatly enhanced by phenobarbital (+172%). Nevertheless, hamsters proved as responsive to phenobarbital induction as rats, since it increased their relative liver weight and microsomal enzyme activity. The deficient induction of liver BSP-conjugating activity observed with phenobarbital is consistent with the finding that it did not affect the hepatic transport of this substrate in hamsters.
Animals↗
[Comparison of methods of assay of amino acids by gas chromatography and ion exchange chromatography].
The measurement of plasma amino acid concentrations (50 samples) by gas-chromatography and by ion-exchange chromatography (IEC) indicates that the two methods correlate well. However, IEC provides higher values for proline, threonine and serine. The results are confirmed by the study of normal values obtained in healthy subjects.
Adult↗