Study of a New TBX5 Mutation in Holt-Oram Syndrome
Author Information
Author(s): Böhm Johann, Heinritz Wolfram, Craig Alexander, Vujic Mihailo, Ekman-Joelsson Britt-Marie, Kohlhase Jürgen, Froster Ursula
Primary Institution: Institut für Humangenetik und Anthropologie, Universität Freiburg, Freiburg, Germany
Hypothesis
The c.1333delC mutation in the TBX5 gene affects the protein's function in Holt-Oram syndrome.
Conclusion
The c.1333delC mutation impairs the activation of the downstream target ANF, suggesting that misfolding of the protein prevents its biological function.
Supporting Evidence
- The c.1333delC mutation leads to an elongated TBX5 protein with additional amino acids.
- The mutation does not affect the nuclear localization of the TBX5 protein.
- The mutated TBX5 protein fails to activate the ANF promoter effectively.
Takeaway
A new mutation in a gene called TBX5 can cause problems in the heart and arms, and this study shows that the mutation makes the protein not work properly.
Methodology
The study involved genetic analysis and functional assays using COS-7 cells to assess the impact of the TBX5 mutation on protein localization and activity.
Limitations
The study was limited to a single patient, and the analysis of the endogenous protein was not possible due to its absence in lymphocytes.
Participant Demographics
The study focused on a 4-year-old male patient with Holt-Oram syndrome.
Digital Object Identifier (DOI)
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