Spectral Diagnostics, Inc.

Shigui Liu

Qinwei Shi

Mingfu Ling

Min Yuan Zhang

Polypeptides corresponding to stable, circulating degradation products of troponin I (TnI) are described. The fragments comprise a sequence of the N-terminus of native cardiac TnI with 95-115 amino acid and additionally include fragments lacking about the 20-30 N-terminal amino acids. Utilities of these fragments and antibodies thereto include sensitive detection of myocardial infarction and purification of antibodies sensitive to the detection of troponin I degradation products.

Troponin I polypeptide fragments and uses thereof

This invention relates to single-chain polypeptides and their genetic sequences comprising a human cardiac troponin I N-terminal fragment and troponin C. The N-terminal fragment may or may not have the intact N-terminus. The single-chain polypeptide may be expressed recombinantly, and a linker or spacer polypeptide or peptide may be interposed between the troponin sequences. The single-chain polypeptides have utility as controls or calibrators for troponin assays, for the purification of troponin subunits and as an antigen for the preparation of antibodies.

Single-chain polypeptides comprising troponin I N-terminal fragments and troponin C

The present invention relates to stable compositions useful as primary standards and calibrators and controls comprising a cardiac troponin I (cTnI) such as native, recombinant, addition and deletion forms thereof, whether or not complexed with other troponin subunits such as TnC and/or TnT, in an inactivated human serum. The compositions are obtained by incubating troponin complexes with human serum. The compositions are characterized by an immunodetectability ratio of epitopes on the N-terminal segment to epitopes on the C-terminal segment substantially equivalent to that of pooled, fresh serum from acute myocardial infarction patients.

Troponin I composition

Stable troponin subunits and complexes and methods for their preparation are described. Among other uses, these subunits and complexes are useful as antigens for the preparation of antibodies, and as controls and calibrators for troponin assays. One complex comprises a modified human cardiac troponin I together with human cardiac troponin T and human cardiac troponin C. Another complex comprises a modified human cardiac troponin I with human cardiac troponin C.

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Mississauga, Canada

Shigui Liu