What is a forward approach in the context of target validation?在目标验证的背景下，什么是前瞻性方法？

Question

BlackTom AI · Accepted Answer

Forward (phenotype-driven or forward genetics) approaches start from an observed disease-related phenotype and work forward to discover the molecular cause or druggable target that produces that phenotype.

1) Relevant knowledge points and concepts
- Forward approach / phenotype-driven strategy: observe a disease phenotype (cell behavior, organismal trait, or drug response) and then use genetic, biochemical or screening methods to identify the gene/protein responsible. Techniques include classical forward genetics, unbiased CRISPR or RNAi screens, and target deconvolution after phenotype-based compound screens.
- Reverse approach / target-driven strategy: begins with a preselected molecular target and tests whether modulating it affects disease.

2) Step-by-step reasoning comparing choices
- Read each option and match to definitions above.
  a) “Screening for compounds that modulate disease phenotypes without prior knowledge of the target.” This describes phenotype-based compound screening (phenotypic screening), which is a tool often used in forward strategies but it emphasizes compound discovery rather than the explicit step of identifying the underlying molecular target. It is related but incomplete as a definition of the forward target-validation approach.
  b) “Using genetic and molecular biology techniques to confirm the relevance of a preselected target” is a reverse (target-driven) validation approach — opposite of forward.
  c) “Analysing gene expression data to retrospectively identify potential drug targets” is an informatics/retrospective discovery method, not the classic forward phenotype→target route.
  d) “Starting with a disease-related phenotype and identifying the underlying molecular target responsible for it.” This precisely matches the forward/phenotype-driven definition.

3) Why d is correct
Option d explicitly captures the core: beginning with phenotype and mapping to the molecular target. That is the central logic and goal of forward approaches in target validation.

4) Why other options are incorrect (brief)
- a) Focuses on compound screening rather than the key forward step of identifying the responsible molecular target.
- b) Describes reverse/target-first validation.
- c) Describes retrospective bioinformatic identification, not the classic phenotype-to-target experimental approach.

Conclusion: The forward approach is correctly described by option d. The final answer matches the provided answer: d.

What is a forward approach in the context of target validation?在目标验证的背景下，什么是前瞻性方法？单项选择题

类似问题

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