scholarly journals Suppression of a lethal trisomic phenotype in Drosophila melanogaster by increased dosage of an unlinked locus.

Genetics ◽  
1993 ◽  
Vol 134 (1) ◽  
pp. 243-249 ◽  
Author(s):  
D R Dorer ◽  
M A Cadden ◽  
B Gordesky-Gold ◽  
G Harries ◽  
A C Christensen
Keyword(s):  
Drosophila Melanogaster ◽  
X Chromosome ◽  
Gene Dosage ◽  
Chromosome Region ◽  
Dosage Effect ◽  
Gene Dosage Effect ◽  
Unlinked Locus ◽  
Lethal Phenotype ◽  
The Third ◽  
Dosage Sensitivity

Abstract One of the most extreme examples of gene dosage sensitivity is the Triplo-lethal locus (Tpl) on the third chromosome of Drosophila melanogaster, which is lethal when present in either one or three copies. Increased dosage of an unlinked locus, Isis, suppresses the triplo-lethal phenotype of Tpl, but not the haplo-lethal phenotype. We have mapped Isis to the X chromosome region 7E3-8A5, and shown that the suppression is a gene dosage effect. Altered dosage of Isis in the presence of two copies of Tpl has no obvious effects. By examining the interactions between Isis dosage and Tpl we suggest that Isis does not directly repress Tpl expression, but acts downstream on the triplo-lethal phenotype of Tpl.

scholarly journals SEGMENTAL ANEUPLOIDY AND ENZYME ACTIVITY AS A METHOD FOR CYTOGENETIC LOCALIZATION IN DROSOPHILA MELANOGASTER

Genetics ◽  
1974 ◽  
Vol 76 (2) ◽  
pp. 301-309
Author(s):  
Barbara R Stewart ◽  
John R Merriam
Keyword(s):  
Enzyme Activity ◽  
X Chromosome ◽  
Gene Dosage ◽  
Chromosome Region ◽  
Structural Genes ◽  
The Third ◽  
Segmental Aneuploidy ◽  
Cytological Localization ◽  
The Relationship ◽  
Chromosome Bands

ABSTRACT A method of mapping genes which specify enzymes without the necessity of obtaining genetic variants has been explored. Three enzymes whose structural genes have known genetic positions were chosen to see if the relationship between gene dosage and enzyme activity could be used as a tool in cytological localization. Zw, the gene specifying G6PD, is located in the X chromosome region, 18D-18F. The structural gene for 6PGD, Pgd, maps in the X chromosome bands 2C1-2E1. Idh-NADP, the gene which specifies IDH-NADP, is found on the third chromosome, in bands 66B-67C.

Susceptibility to systemic lupus erythematosus may be related to gene dosage effect of the X chromosome

2009 ◽  
Vol 72 (1) ◽  
pp. 104-105 ◽  
Author(s):  
Hai-Feng Pan ◽  
Wen-Xian Li ◽  
Hui Yuan ◽  
Lian-Hong Li ◽  
Jin-Bao Feng ◽  
...  
Keyword(s):  
Systemic Lupus Erythematosus ◽  
X Chromosome ◽  
Lupus Erythematosus ◽  
Gene Dosage ◽  
Dosage Effect ◽  
Systemic Lupus ◽  
Gene Dosage Effect

scholarly journals Taste sensitivity to trehalose and its alteration by gene dosage in Drosophila melanogaster.

Genetics ◽  
1988 ◽  
Vol 119 (2) ◽  
pp. 399-406
Author(s):  
T Tanimura ◽  
K Isono ◽  
M T Yamamoto
Keyword(s):  
Drosophila Melanogaster ◽  
X Chromosome ◽  
Gene Dosage ◽  
Taste Sensitivity ◽  
Gene Dosage Effect ◽  
Upper Limit ◽  
Proportional Increase ◽  
Cytological Localization ◽  
Low Sensitivity ◽  
Normal Dosage

Abstract The taste sensitivity to the disaccharide trehalose of Drosophila melanogaster is under the genetic control by the Tre gene on the X chromosome. The gene is genetically dimorphic for high and low sensitivity and is likely to be functioning in the primary step of chemoreception. We have determined the cytological localization of the Tre gene to be between 5A10 and 5B1-3 by analyzing the sensitivity to trehalose in flies which are segmentally aneuploid bearing either deficiencies or duplicated fragments of T(X;Y) translocations. We also constructed flies which are aneuploidy and thus carry different dosage of Tre and/or Tre(+) alleles in order to examine the gene dosage effect on trehalose sensitivity and to deduce the nature of the gene's action. Trehalose sensitivity decreased in females carrying half the normal dosage of a given Tre allele, but a proportional increase in sensitivity was not observed in flies bearing a duplication of the Tre alleles. The changes in sensitivity in various aneuploid flies suggest that there is an upper limit to the number of molecules that can be incorporated into the receptor membrane. Genetic evidence strongly suggests that Tre is the structural gene for the trehalose receptor. We present a model to account for the mechanism of genetical control on the sensitivity to trehalose.

Evidence of a gene-dosage effect for the glucocorticoid receptor in trisomy 18 mice

1987 ◽  
Vol 116 (3_Suppl) ◽  
pp. S95-S96
Author(s):  
D. VOGLIOLO ◽  
H. WINKING ◽  
R. KNUPPEN
Keyword(s):  
Glucocorticoid Receptor ◽  
Gene Dosage ◽  
Dosage Effect ◽  
Trisomy 18 ◽  
Gene Dosage Effect

Apparent Lack of Gene Dosage Effect in the PLT Assay

1977 ◽  
Vol 6 (5) ◽  
pp. 529-532 ◽  
Author(s):  
S. JARAMILLO ◽  
G. ANHORN ◽  
F. SCHUNTER ◽  
P. WERNET
Keyword(s):  
Gene Dosage ◽  
Dosage Effect ◽  
Gene Dosage Effect ◽  
Apparent Lack

Gene dosage effect in expression of blood group antigens

1973 ◽  
Vol 83 (2) ◽  
pp. 167-172
Author(s):  
Li-Tsun Chen ◽  
Joseph A. Davidenas ◽  
Roal F. Ruth
Keyword(s):  
Blood Group ◽  
Gene Dosage ◽  
Dosage Effect ◽  
Blood Group Antigens ◽  
Gene Dosage Effect

scholarly journals THE GENETIC BASIS OF DOSAGE COMPENSATION OF ALCOHOL DEHYDROGENASE-1 IN MAIZE

Genetics ◽  
1981 ◽  
Vol 97 (3-4) ◽  
pp. 625-637 ◽  
Author(s):  
James A Birchler
Keyword(s):  
Alcohol Dehydrogenase ◽  
Structural Gene ◽  
Dosage Compensation ◽  
Genetic Basis ◽  
Gene Dosage ◽  
Dosage Effect ◽  
Gene Dosage Effect ◽  
Negative Effect ◽  
Higher Eukaryotes ◽  
Alcohol Dehydrogenase 1

ABSTRACT The levels of alcohol dehydrogenase (ADH) do not exhibit a structural gene-dosage effect in a one to four dosage series of the long arm of chromosome one (1L) (BIRCHLER19 79). This phenomenon, termed dosage compensation, has been studied in more detail. Experiments are described in which individuals aneuploid for shorter segments were examined for the level of ADH in order to characterize the genetic nature of the compensation. The relative ADH expression in segmental trisomics and tetrasomics of region IL 0.72–0.90, which includes the Adh locus, approaches the level expected from a strict gene dosage effect. Region IL 0.20–0.72 produces a negative effect upon ADH in a similar manner to that observed with other enzyme levels when IL as a whole is varied (BIRCHLEF1I9 79). These and other comparisons have led to the concept that the compensation of ADH results from the cancellation of the structural gene effect by the negative aneuploid effect. The example of ADH is discussed as a model for certain other cases of dosage compensation in higher eukaryotes.

scholarly journals Studies of esterase 6 in Drosophila melanogaster: XIV. Variation of esterase 6 levels controlled by unlinked genes in natural populations

1984 ◽  
Vol 43 (2) ◽  
pp. 181-190 ◽  
Author(s):  
Craig S. Tepper ◽  
Anne L. Terry ◽  
James E. Holmes ◽  
Rollin C. Richmond
Keyword(s):  
Drosophila Melanogaster ◽  
Structural Gene ◽  
X Chromosome ◽  
Genetic Background ◽  
Natural Populations ◽  
Regulatory Elements ◽  
Regulatory Locus ◽  
The Third ◽  
Esterase 6 ◽  
Activity Modifiers

SUMMARYThe esterase 6 (Est-6) locus in Drosophila melanogaster is located on the third chromosome and is the structural gene for a carboxylesterase (E.C.3.1.1.1) and is polymorphic for two major electromorphs (slow and fast). Isogenic lines containing X chromosomes extracted from natural populations and substituted into a common genetic background were used to detect unlinked factors that affect the activity of the Est-6 locus. Twofold activity differences of esterase 6 (EST 6) were found among males from these derived lines, which differ only in their X chromosome. These unlinked activity modifiers identify possible regulatory elements. Immunoelectrophoresis was used to estimate quantitatively the levels of specific cross-reacting material in the derived lines. The results show that the variation in activity is due to differences in the amount of EST 6 present. The data are consistent with the hypothesis that there is at least one locus on the X chromosome that regulates the synthesis of EST 6 and that this regulatory locus may be polymorphic in natural populations.

Further evidence for the assignment of the red cell acid phosphatase gene (ACP1) to the short arm of chromosome 2 from gene dosage effect

1976 ◽  
Vol 16 (1-5) ◽  
pp. 326-327
Author(s):  
R.E. Magenis ◽  
R.D. Koler ◽  
E. Lovrien ◽  
R.H. Bigley ◽  
M.C. DuVal ◽  
...  
Keyword(s):  
Acid Phosphatase ◽  
Gene Dosage ◽  
Dosage Effect ◽  
Red Cell ◽  
Chromosome 2 ◽  
Gene Dosage Effect ◽  
I Gene
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