Effect of deafferentation of the liver on hepatocytes located in various parts of the hepatic lobule

Taking into account the data on functional heterogeneity of hepatocytes, situating in various parts of the hepatic lobule, influence of deafferentation of the cat liver on changes in the size of hepatocytes and their nuclei, as well as contents of glycogen and nucleic acids in their cytoplasm have been investigated. The greatest decrease of the glycogen contents and the greatest increase of the nucleic acids and the nuclei volume take place in hepatocytes, situating around the central vein.     

Radioautographic study of a culture of fibroblasts after irradiation by a neodymium laser]

By means of radioautographic method, with 3H-thymidin application there were studied: mitotic activity, the number of DNA-synthesizing cells, growth fraction and population number of fibroblast culture irradiated with a single impulse of neodymium laser at energy density within 1 Dg/cm2--100 Dg/cm2. Under the influence of small doses of laser radiation (1--10 Dg/cm2) the number of dividing DNA-synthesizing cells increased, together with proliferative pool and the number of cells in the field of vision. At energy density of laser radiation equal to 50 Dg/cm2, and especially to 100 Dg/cm2 despite increased mitotic index and labelled cells index, registered during first hours of the effect, proliferative pool decreased and population growth rate lowered. These doses of laser radiation produced destruction of a rather large part of the cells in a monolayer.     

Frequency and rearrangements of alleles of proto-oncogene c-Ha-ras-1 and their association with development of various malignant tumors in man

The c-Ha-ras-1 locus in 84 cancer patients was examined for allelic restriction fragment length's polymorphism, as well as for distribution of four common c-Ha-ras-1 alleles (a1, a2, a3 and a4) in lung, ovarian and thyroid cancer patients. In approximately half (8 out of 15) lung and ovarian carcinomas possessing a4 allele, alterations in the Ha-ras locus (deletion, amplification and change in allele length) were detected, as compared to 2 cases of rearrangements out of 40 tumors lacking the a4 allele. An increased a4 allele frequency was found in individuals with lung and ovarian carcinomas, as compared to both controls--summarized literature data, and thyroid cancer patients. On the other hand, homozygosity for the a2 locus, resulting from deletion in another allele, and increased a2 allele frequency in thyroid cancer patients were observed. Thus, a4 and a2 alleles of the c-Ha-ras-1 may perhaps be viewed as genetic markers of predisposition to lung, ovarian and thyroid cancer, respectively, in combination with other clinical parameters.     

Associations between the coat color and the blood-group system D antigens in horses]

The study of the association between the coat-color variants and the blood-group system D antigens in the populations of two related trotter breeds (Orlov Trotter and Russian Trotter) showed the presence of three associations between these characters in the Orlov Trotter breed. In the populations of Russian trotters, these associations were not detected. Possible reasons for the formation and maintenance of these associations and the role of the selection for coat color in the differentiation of breeds by the frequencies of some system D antigens are discussed.     

Genetic relationship of the loci of phosphohexose isomerase and G-system blood groups in swine

The hybridological analysis for gene mapping of the locus of phosphohexose isomerase (PHI) of pigs was carried out. The locus of G blood group system was used as a marker of the chromosome 15. 26 families with 200 piglets were obtained from backcross matings. The analysis of haplotype segregation pointed to the lack of independent inheritance of PHI and G systems loci and to weak linkage between these loci. The recombination frequency was estimated to be 39%. The results obtained are discussed in connection with the problem of establishment of accurate gene maps.     

The association of genetic markers in two related swine breeds]

The combinations of genetic markers (allotypes, blood-group systems, and polymorphic proteins) were analyzed in pigs of two phylogenetically related Siberian populations: the newly selected Siberian specialized meat breed SM-1 (daughter breed) and the reproductive core of the Kemerovo breed (maternal breed). Statistically significant interlocus associations were found between the genetic markers that are known not to be linked, being assigned to different linkage groups, and the main selected meat-productivity traits. Some of these associations were shared by both breeds; others were found to be specific to either maternal or daughter populations. Possible genetic mechanisms underlying these associations and their significance are discussed.