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A last point worth mentioning is that research on transcription factor
binding sites is increasingly based on physical models of protein-DNA inter-
actions and quantitative affinity data. Protein-binding microarrays
(PBMs) 48 and related technologies 49 allow measurement of thousands of
interaction energies in parallel. The TRAP model, 50 which defines the
quantitative relationship between DNA sequence and PBM signal based
on a weight matrix, provides a theoretical basis for inference of a binding
energy matrix from quantitative affinity data. Likewise, thermodynamic
modeling of the SELEX process led to the proposal of a new mathemati-
cal formula to convert base probabilities from motif discovery into base
pair-protein interaction energies. 51
There is definitely more work to be done in the field of DNA motif
discovery.
References
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