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CHROMATOGRAPHY OF DROSOPHILA EYE PIGMENTS ..

28. Bessa J, Gebelein B, Pichaud F. . Combinatorial control of Drosophila eye development by Eyeless, Homothorax, and Teashirt. 2002;16:2415-7

Among these compounds, echinenone and canthaxantin are abundant in cyanobacteria are characteristic of cyanobacteria ().

Violaxanthin is an epoxidized derivative of antheraxanthin (hydroxylated cryptoxanthin) and forms with zeaxanthin the xanthophyll cycle that is said to protect the photosynthetic system of plants against damage by excess light.

I have Drosophila melanogaster which I am doing an eye pigmentation assay on ..
Photo provided by Flickr

Regulation of eye-pigment metabolism in Drosophila ..

T1 - pcdr, a novel gene with sexually dimorphic expression in the pigment cells of the Drosophila eye
Photo provided by Flickr

We report the molecular cloning and characterization of pcdr (pigment cell dehydrogenase reductase), a Drosophila visual system-specific gene with novel properties of spatial, temporal and sexual regulation. Short chain dehydrogenase/reductases are a family of proteins that catalyze mechanistically conserved dehydrogenase/reductase reactions in a wide range of cells and tissues. These enzymes are required in a variety of reactions ranging from steroid metabolism and prostaglandin synthesis to alcohol detoxification. The Drosophila pcdr gene encodes a new member of this family, displaying 42% amino acid sequence identity to the mammalian prostaglandin dehydrogenase. pcdr expression is restricted to the visual system with very high levels found in the pigment cells. Interestingly, expression of pcdr mRNA is sexually dimorphic with males showing higher levels of expression than females. This sexual dimorphism is under the control of the sex differentiation cascade as transformer and transformer 2 mutations shift females to a male-like level of expression. Finally, we demonstrate that a region of 335 nucleotides including sequences upstream and just downstream of the transcription start is sufficient to reproduce the normal expression pattern.

N2 - We report the molecular cloning and characterization of pcdr (pigment cell dehydrogenase reductase), a Drosophila visual system-specific gene with novel properties of spatial, temporal and sexual regulation. Short chain dehydrogenase/reductases are a family of proteins that catalyze mechanistically conserved dehydrogenase/reductase reactions in a wide range of cells and tissues. These enzymes are required in a variety of reactions ranging from steroid metabolism and prostaglandin synthesis to alcohol detoxification. The Drosophila pcdr gene encodes a new member of this family, displaying 42% amino acid sequence identity to the mammalian prostaglandin dehydrogenase. pcdr expression is restricted to the visual system with very high levels found in the pigment cells. Interestingly, expression of pcdr mRNA is sexually dimorphic with males showing higher levels of expression than females. This sexual dimorphism is under the control of the sex differentiation cascade as transformer and transformer 2 mutations shift females to a male-like level of expression. Finally, we demonstrate that a region of 335 nucleotides including sequences upstream and just downstream of the transcription start is sufficient to reproduce the normal expression pattern.

transport of eye pigment precursors in Drosophila ..

AB - We report the molecular cloning and characterization of pcdr (pigment cell dehydrogenase reductase), a Drosophila visual system-specific gene with novel properties of spatial, temporal and sexual regulation. Short chain dehydrogenase/reductases are a family of proteins that catalyze mechanistically conserved dehydrogenase/reductase reactions in a wide range of cells and tissues. These enzymes are required in a variety of reactions ranging from steroid metabolism and prostaglandin synthesis to alcohol detoxification. The Drosophila pcdr gene encodes a new member of this family, displaying 42% amino acid sequence identity to the mammalian prostaglandin dehydrogenase. pcdr expression is restricted to the visual system with very high levels found in the pigment cells. Interestingly, expression of pcdr mRNA is sexually dimorphic with males showing higher levels of expression than females. This sexual dimorphism is under the control of the sex differentiation cascade as transformer and transformer 2 mutations shift females to a male-like level of expression. Finally, we demonstrate that a region of 335 nucleotides including sequences upstream and just downstream of the transcription start is sufficient to reproduce the normal expression pattern.

pcdr, a novel gene with sexually dimorphic expression in the pigment cells of the Drosophila eye
Photo provided by Flickr

We have cloned vermilion (v), one of the genes required for brown eye pigment synthesis in Drosophila, using a mutant (vH2a) "tagged" with the transposon P factor. Mutations that disrupt v gene expression are clustered within approximately 2 kilobases of DNA. A 1.4-kilobase transcript, homologous to this same region, is present in v+ RNA but absent in RNA from several v mutants. The spontaneous v alleles that are suppressed by the suppressor of sable [su(s)] are apparently identical insertions of 412, a copia-like transposable element. Preliminary evidence suggests that su(s)-suppressible alleles at other loci may also be 412 insertions.

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eye pigment in Drosophila: vermilion ..


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