Splitting p63 The American Journal of Human Genetics

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Presentation transcript:

Splitting p63 The American Journal of Human Genetics Hans van Bokhoven, Han G. Brunner The American Journal of Human Genetics Volume 71, Issue 1, Pages 1-13 (July 2002) DOI: 10.1086/341450 Copyright © 2002 The American Society of Human Genetics Terms and Conditions

Figure 1 Structure of both TP63 and major protein isotypes. TP63 uses several transcription initiation sites (arrows) and extensive alternative splicing, to generate a bewildering number of different mRNAs. For clarity, several alternative-splicing routes at the 5′ end of the gene have not been indicated. Several protein domains can be distinguished; of these, the TA domains, the DBD, and the ISO domain are highly homologous to the corresponding domains in p53. The SAM domain and the TID are not contained in the p53 protein. The capacity to transactivate gene expression at a p53-responsive target is given for each of the indicated isotypes. The American Journal of Human Genetics 2002 71, 1-13DOI: (10.1086/341450) Copyright © 2002 The American Society of Human Genetics Terms and Conditions

Figure 2 Distribution of missense mutations in the DBDs of p53 and p63. Amino acid–sequence comparison of the DBDs of p53, p63, and p73 reveals a high conservation, especially in the core domains (boxed). Within these core domains, amino acids that directly interact with the DNA and amino acids that form the Zn-binding pocket of the protein are highlighted. The black bars on top represent the incidence of somatic p53 mutations in tumors at the corresponding amino acids; the colored bars beneath the sequences represent the incidence of p63 mutations in the indicated human disorders. The p53-mutation spectrum is based on the IARC TP53 Mutation Database. The American Journal of Human Genetics 2002 71, 1-13DOI: (10.1086/341450) Copyright © 2002 The American Society of Human Genetics Terms and Conditions

Figure 3 Distribution of mutations in p63, revealing a genotype-phenotype correlation. The approximate positions of truncating mutations (left) and amino acid changes (right) are indicated, together with the associated phenotype, with respect to the occurrence of ectrodactyly and the type of facial clefting. (For discussion, see text.) DNA binding = DBD; ISO = ISO domain; SAM = SAM domain. The American Journal of Human Genetics 2002 71, 1-13DOI: (10.1086/341450) Copyright © 2002 The American Society of Human Genetics Terms and Conditions

Figure 4 A gain-of-function mutation in ADULT syndrome reveals a second TA domain (TA2) in p63. A and B, Models explaining the gain-of-function effect that the R298Q mutation has on the ΔN-p63γ isotype, which normally does not posses transactivation. The TA2 domain is normally kept in an inactive state, either because of intramolecular interaction (A) or because of binding of another protein (B). This inhibition is proposed to be released in patients with ADULT syndrome because the R298Q mutation abolishes this protein-protein interaction. DNA-BD = DBD; Iso = ISO domain; TA2 = TA2 domain. C, Position of TA2 domain, as determined by Dohn et al. (2001). The TA2 domain consists of 14 amino acids specific to the ΔN isotypes and 12 amino acids common to all p63 isotypes. Interestingly, another ADULT-syndrome mutation and an LMS mutation both give rise to amino acid substitutions within the TA2 domain. DNA binding = DBD; Iso = ISO domain. The American Journal of Human Genetics 2002 71, 1-13DOI: (10.1086/341450) Copyright © 2002 The American Society of Human Genetics Terms and Conditions