Proteomic profiling of cardiac tissue by isolation of nuclei tagged in specific cell types (INTACT)

Nirav M. Amin, Todd M. Greco, Lauren M. Kuchenbrod, Maggie M. Rigney, Mei I. Chung, John B. Wallingford, Ileana M. Cristea, Frank L. Conlon

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The proper dissection of the molecular mechanisms governing the specification and differentiation of specific cell types requires isolation of pure cell populations from heterogeneous tissues and whole organisms. Here, we describe a method for purification of nuclei from defined cell or tissue types in vertebrate embryos using INTACT (isolation of nuclei tagged in specific cell types). This method, previously developed in plants, flies and worms, utilizes in vivo tagging of the nuclear envelope with biotin and the subsequent affinity purification of the labeled nuclei. In this study we successfully purified nuclei of cardiac and skeletal muscle from Xenopus using this strategy. We went on to demonstrate the utility of this approach by coupling the INTACT approach with liquid chromatography-tandem mass spectrometry (LC-MS/MS) proteomic methodologies to profile proteins expressed in the nuclei of developing hearts. From these studies we have identified the Xenopus orthologs of 12 human proteins encoded by genes, which when mutated in human lead to congenital heart disease. Thus, by combining these technologies we are able to identify tissue-specific proteins that are expressed and required for normal vertebrate organ development.

Original languageEnglish (US)
Pages (from-to)962-973
Number of pages12
JournalDevelopment (Cambridge)
Issue number4
StatePublished - Feb 15 2014

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Developmental Biology


  • Cardiac muscle
  • Proteomics
  • Skeletal muscle
  • Xenopus


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