Biomedical subjects

H Gyurkovics

Publications and source records attributed to H Gyurkovics.

21 records · Page 2Linked to original sources

PubMed1981

Genetic and cytogenetic studies of malic enzyme in Drosophila melanogaster.

The genetic and cytogenetic locations of the structural gene (Men) for malic enzyme have been determined. Men maps genetically between kar and ry at 51.73 +/- 0.02. Cytogenetically, Men probably lies in the proximal edge of 87D1,2, based on the results of mapping utilizing a number of deficiencies with breakpoints in that region. A number of null alleles have been recovered; heterozygotes for these nulls and a Men deficiency are both viable and fertile. These findings are related to the one band, one functional unit model of salivary gland chromosome structure.

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PubMed1981

Genetic characterization of the region between 86F1,2 and 87B15 on chromosome 3 of Drosophila melanogaster.

The region between 86F1,2 and 87B15 on chromosome 3 of Drosophila melanogaster, which contains about 27 polytene chromosome bands including the 87A7 heat-shock locus, has been screened for EMS-induced visible and lethal mutations. We have recovered 268 lethal mutations that fall into 25 complementation groups. Cytogenetic localization of the complementation groups by deficiency mapping is consistent with the notion that each band encodes a single genetic function. We have also screened for mutations at the 87A7 heat shock locus, using a chromosome that has only one copy of the gene encoding the 70,000 dalton heat-shock protein (hsp70). No lethal or visible mutations at 87A7 were identified from 10,719 mutagenized chromosomes, and no female-sterile mutations at 87A7 were recovered from the 1,520 chromosomes whose progeny were tested for female fertility. We found no evidence that a functional hsp70 gene is required for development under laboratory conditions.

Animals↗

PubMed1979

Deletion mapping of two D. melanogaster loci that code for the 70,000 dalton heat-induced protein.

Using deficiencies in D. melanogaster that lack either the 87A or 87C heat-induced puffs, we have shown that the 70,000 dalton heat-induced protein (hsp 70) is encoded at both these loci. Embryos deleted for one of the two loci retain the ability to make hsp 70 after heat shock, but deleting both loci eliminates synthesis of hsp 70. Thus both loci encode hsp 70 and can be active following heat shock. We have analyzed the proteins made by embryos lacking either 87A or 87C, and have compared the 87A- and 87C-coded hsp 70 by isoelectric focusing and tryptic peptide fingerprinting. The hsp 70 made by the two loci is very similar, although a variant tryptic peptide appears to be encoded only at 87C. Using deficiencies with slightly different breakpoints, we have mapped the 87A locus to band 87A7, the site of the 87A heat-induced puff. The 87C locus maps within 87C1.

Animals↗