Clinical applications based on recombinant polymers for delivery of bioactive agents have not been realized at this point. Additionally, protein based polymers on other natural motifs and de novo designs are starting to produce promising constructs for drug and gene delivery applications where precise control over structure promises correlation with function and guides the development of new and improved constructs.

Research into elastin-like, silk-like, and silk–elastinlike protein polymers for example has led to the development of delivery systems based on natural motifs of structural proteins to take advantage of their physicochemical properties. Encoding at the genetic level and production of such recombinant polymers in organisms allow for precise order and accuracy of amino acid residues and production of monodisperse polymers with specific function and physicochemical properties. However they have drawbacks, including limitations involved in statistical characterization of conventional polymer synthetic techniques. Chemically derived and developed methods of synthesis have yielded many useful polymers for drug delivery to-date, including those currently used in patients. The ability to study how precise structures correlate with function has provided opportunities for the utility of these polymers in drug delivery. Advances in recombinant techniques have led to the development of genetically engineered polymers with exquisite control over monomer sequence and polymer length.

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