Biomedical subjects
Publications and source records attributed to M Viau.
In this work, we present new data on the Hp1alpha- and Hp2alpha-chains polymorphism in different populations. We confirm the singularity of the geographical distribution of the Hp2 alleles in our samples. The analysis of the results shows that a significant correlation exists in the population between the Hp1S and Hp2 gene frequencies. An additional Hp1alpha-chain variant is described in a Pyrenean sample.
A new method based on isofocusing electrophoresis in the study of the Gc (group-specific component) polymorphism, revealed differing electrophoretic patterns. These patterns can be explained by the existence of two codominant Gc1 subtypes. This hypothesis is in accordance with several family studies. These subtypes are called Gc1F and Gc1S. Eight hundred samples were analyzed, including three different populations: Caucasoid (a western Pyrenean valley), African (Pygmy Bi-Aka), and AMerindian (Quechua-Aymara, from Bolivia). These two subtype phenotypes cannot be explored with the usual technique. They were present in each population sample studied.
This study has analyzed the haptoglobin genotype frequencies in over 900 samples from populations living on the Northern slopes of the Pyrenees. The results emphasize the importance of systematically determining the frequencies of the Hp1S, Hp1F, Hp2SS, Hp2FF, Hp2FS alleles. Hp1S was the predominant allele, the HpIS/Hp1 distribution varying between .5 and .69 as in most European populations. Hp2 alleles were observed in low frequency with differences in geographically distinct samples. Pyrenean populations in the western zones (Basques and Baronnies) were found to contain the Hp2FF allele while those in eastern regions, the Hp2SS allele. We have speculated that Hp2SS is as old as the Hp2FF, arising from southern Mediterranean areas, and suggest that Pyrenean groups have different origins.
The authors demonstrated in the urine of patients presenting Paget's bone disease a peptide rich in hydroxyproline. The level of this compound expressed as "norleucine equivalent" was determined by chromatographic analysis of the urinary amino acids. There was a very good correlation between the total hydroxyproline level and the quantity of this peptide in the urine. The authors isolated this peptide and determined that it contained 3 hydroxyprolines for every 2 glutamines. This peptide thus seems to indicate an anomaly in the chain of synthesis; a disorder of the collagen metabolism would produce in these patients large quantities of these molecules that are excreted via the kidney. At the present stage of the author's studies this urinary peptide appears to be "specific" to Pagets disease.
By a bidimensional immuno-isofocalisation electrophoresis method a new PiN allel was revealed in 365 samples collected in a Caucasoïd population from a Central Pyrenees Valley (Les Baronnies). Its high frequency (0,151) contributes to the decrease of the PiM one. The different NS, MN and NN phenotypes were formerly classed respectively as MS and MM phenotypes. PiN allel seems to be widely distributed in Mediterranean populations.
THE Hl1f, Hp1s and Hp2 gene frequencies were studied in two French population samples: one from the Toulouse area and one from a Basque district. The hp alpha1F and alpha1S polypeptide chains were determined by a simple technique. The observations were in accordance with previous findings in Caucasoid populations. The frequency of the Hp1S gene was slightly higher in the Basque sample than in the group from Toulouse.
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