Isoform
Isoform — Any of several different forms of the same protein or peptide arising from genetic variation, alternative splicing, or post-translational modification.
What Is an Isoform?
An isoform is a variant of a peptide or protein arising from different genes (paralogs), alternative mRNA splicing, or post-translational modifications. Peptide hormone isoforms may have different biological activities, receptor selectivities, and tissue distributions. Distinguishing isoforms is essential for accurate biomarker measurement.
Examples
- Somatostatin: SST-14 and SST-28 isoforms with different receptor subtype preferences
- Endothelin: ET-1, ET-2, ET-3 encoded by separate genes with different tissue distribution
- IGF-1: Multiple splice variants (IGF-1Ea, IGF-1Eb/MGF, IGF-1Ec)
Frequently Asked Questions
What is Isoform?
Any of several different forms of the same protein or peptide arising from genetic variation, alternative splicing, or post-translational modification.
Why is Isoform important in peptide research?
Isoform is a fundamental concept in biochemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.