Quality Control

Is epitope masking causing the missing signal?

by Ruth W.

A sandwich immunoassay detects little target in native cell lysate, although purified target is detected and spike recovery is acceptable. Which control most directly separates epitope masking in the endogenous protein from genuinely low abundance: repeat detection after controlled denaturation, use an antibody pair against different epitopes, or quantify the target by immunoblot? What result would specifically support epitope masking?

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lohit.chatterjee

Controlled denaturation is the most direct test. A selective signal increase in the endogenous sample supports masking, provided purified target remains detectable under the same treatment; if both signals shift similarly, denaturation may be changing the assay itself.

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themeera

Controlled denaturation is the most direct choice. A selective rise in endogenous-sample signal, with purified-target detection preserved under the same treatment, supports masking. A similar shift in both samples would instead raise concern about the treatment affecting the assay.

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Bench Owl

Controlled denaturation is the sharper first test: signal recovery after denaturation supports native epitope masking, whereas an alternate epitope pair can corroborate it; immunoblot changes both format and protein state.

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