Gene Expression Analysis (RT-PCR/qPCR)

Quantitative measurement of messenger RNA establishes whether a treatment reached its target and altered transcription of the gene it was designed to affect. For gene silencing programs it is the primary efficacy readout. For small molecule and biologic programs it is the pharmacodynamic anchor that links exposure to biological effect.

Altogen Labs provides gene expression analysis by reverse transcription PCR and quantitative PCR on cultured cells, tumor tissue, and organs collected from in vivo studies. Assays are designed around the target gene, sample matrix, and the biological question rather than assembled from a fixed panel. Because the analysis is performed in the same facility that conducts the in vivo work, tissue is stabilized at collection for the assay it will feed rather than by a default method chosen before the endpoint was known.

To discuss an expression endpoint for a planned study, request a quote.

Assay design

Design begins with target and reference gene selection. Reference gene choice is not a formality, since normalizing to a gene whose expression is itself altered by the treatment will distort every result in the study. Reference stability is assessed in the relevant tissue and treatment condition rather than assumed from convention.

Primer and probe design follows, with amplification efficiency and specificity verified before sample analysis begins. An assay with poor efficiency produces quantification that appears precise and is systematically wrong, and the error is invisible unless efficiency was measured. Both SYBR-based and probe-based chemistries are supported, with the choice made on specificity requirements and multiplexing needs.

Sample types and handling

Analysis is performed on cultured cells, tumor tissue, and other tissues collected from in vivo studies. RNA integrity determines whether a result is meaningful, and integrity is established by the interval and conditions between collection and stabilization rather than by anything done afterward. Necropsy and tissue collection is coordinated so that samples destined for expression analysis are stabilized promptly and held appropriately, and isolation is performed with yield and integrity assessed before samples enter the assay.

Applications

Common applications include target engagement and pharmacodynamic readouts, confirmation of knockdown in RNAi programs, confirmation of overexpression in stable cell line development, biomarker measurement, and characterization of treatment response in efficacy studies. Expression data are frequently reported alongside protein-level analysis, since transcript reduction without corresponding protein reduction is a common and informative finding rather than a contradiction.

Applied examples

Knockdown confirmation in vivo. Liver and kidney are collected at defined timepoints following administration of a formulated siRNA, with target transcript measured against vehicle controls in each tissue, establishing both the magnitude and the tissue specificity of knockdown.

Pharmacodynamic time course. Tumor tissue is collected from satellite animals at intervals after a single dose, with a transcriptional marker of pathway inhibition measured at each point and related to plasma concentration from the same animals.

Stable line validation. Candidate clones from a stable cell line development program are screened for transgene expression, with expression stability confirmed across multiple passages before a clone is selected.

Data reporting and method documentation

Results are reported as relative expression against selected reference genes, with the normalization approach, replicate structure, amplification efficiency, and statistical treatment stated in the report rather than left implicit. Raw amplification data are retained alongside analyzed results so that a client can re-derive any reported value independently. Acceptance criteria for assay performance are defined before samples are run, and samples failing them are reported as such rather than silently included.

Send target gene, tissue type, and study context, or request a quote.