In such cases, the homologous double mutant may exhibit a much stronger phenotype than either single mutant. Enhancer gene screenings in Drosophila receptor tyrosine kinase signaling identified genes for Ras1, a downstream GTPase, Sos, a guanine nucleotide exchange factor for Ras1 [13], and Drk, an SH3-SH2-SH3 adaptor for Sos By utilizing analogy to genetic enhancer screening, chemical enhancer screenings can be performed (Figure 2). Difference between genetics and chemical genetics is ease of dosage manipulation. In vertebrate genetics, dosage manipulations are usually achieved by choosing homozygotes or heterozygotes. Heterozygotes are not always the best dosage for the enhancer screening. However, pharmacological methods theoretically allow unrestricted dosage controls. Chemical enhancements may be well known phenomena as synergistic effects of medicines. A good example is synergy between sulfamethoxazole and trimethoprim that is used in the treatment of bacterial, fungal, and protozoan infections [15].
In such cases, the homologous double mutant may exhibit a much stronger phenotype than either single mutant. Enhancer gene screenings in Drosophila receptor tyrosine kinase signaling identified genes for Ras1, a downstream GTPase, Sos, a guanine nucleotide exchange factor for Ras1 [13], and Drk, an SH3-SH2-SH3 adaptor for Sos By utilizing analogy to genetic enhancer screening,การฉายภาพทางเคมีที่สามารถดำเนินการได้ ( รูปที่ 2 ) ความแตกต่างระหว่างพันธุศาสตร์และพันธุศาสตร์คือความสะดวกของเคมียาการจัดการ ในพันธุศาสตร์ของสัตว์มีกระดูกสันหลัง , ยา manipulations มักจะทำได้โดยเลือก homozygotes หรือยีน . ยีนจะไม่เสมอที่ดีที่สุดเพื่อเพิ่มปริมาณการคัดกรอง . อย่างไรก็ตาม pharmacological methods theoretically allow unrestricted dosage controls. Chemical enhancements may be well known phenomena as synergistic effects of medicines. A good example is synergy between sulfamethoxazole and trimethoprim that is used in the treatment of bacterial, fungal, and protozoan infections [15].
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