PUBLICATION
A novel de novo TP63 mutation in whole-exome sequencing of a Syrian family with Oral cleft and ectrodactyly
- Authors
- Simpson, C.L., Kimble, D.C., Chandrasekharappa, S.C., NISC Comparative Sequencing Program, Alqosayer, K., Holzinger, E., Carrington, B., McElderry, J., Sood, R., Al-Souqi, G., Albacha-Hejazi, H., Bailey-Wilson, J.E.
- ID
- ZDB-PUB-230420-55
- Date
- 2023
- Source
- Molecular genetics & genomic medicine 11(8): e2179 (Journal)
- Registered Authors
- Chandrasekharappa, Settara, Sood, Raman
- Keywords
- cleft lip, cleft palate, congenital, limb deformities, whole-exome sequencing
- MeSH Terms
-
- Animals
- Cleft Lip*/genetics
- Cleft Palate*/genetics
- Exome Sequencing
- Humans
- Mutation
- Syria
- Transcription Factors/genetics
- Tumor Suppressor Proteins/genetics
- Zebrafish/genetics
- PubMed
- 37070724 Full text @ Mol Genet Genomic Med
Citation
Simpson, C.L., Kimble, D.C., Chandrasekharappa, S.C., NISC Comparative Sequencing Program, Alqosayer, K., Holzinger, E., Carrington, B., McElderry, J., Sood, R., Al-Souqi, G., Albacha-Hejazi, H., Bailey-Wilson, J.E. (2023) A novel de novo TP63 mutation in whole-exome sequencing of a Syrian family with Oral cleft and ectrodactyly. Molecular genetics & genomic medicine. 11(8):e2179.
Abstract
Background Oral clefts and ectrodactyly are common, heterogeneous birth defects. We performed whole-exome sequencing (WES) analysis in a Syrian family. The proband presented with both orofacial clefting and ectrodactyly but not ectodermal dysplasia as typically seen in ectrodactyly, ectodermal dysplasia, and cleft lip/palate syndrome-3. A paternal uncle with only an oral cleft was deceased and unavailable for analysis.
Methods Variant annotation, Mendelian inconsistencies, and novel variants in known cleft genes were examined. Candidate variants were validated using Sanger sequencing, and pathogenicity assessed by knocking out the tp63 gene in zebrafish to evaluate its role during zebrafish development.
Results Twenty-eight candidate de novo events were identified, one of which is in a known oral cleft and ectrodactyly gene, TP63 (c.956G > T, p.Arg319Leu), and confirmed by Sanger sequencing.
Conclusion TP63 mutations are associated with multiple autosomal dominant orofacial clefting and limb malformation disorders. The p.Arg319Leu mutation seen in this patient is de novo but also novel. Two known mutations in the same codon (c.956G > A, p.(Arg319His; rs121908839, c.955C > T), p.Arg319Cys) cause ectrodactyly, providing evidence that mutating this codon is deleterious. While this TP63 mutation is the best candidate for the patient's clinical presentation, whether it is responsible for the entire phenotype is unclear. Generation and characterization of tp63 knockout zebrafish showed necrosis and rupture of the head at 3 days post-fertilization (dpf). The embryonic phenotype could not be rescued by injection of zebrafish or human messenger RNA (mRNA). Further functional analysis is needed to determine what proportion of the phenotype is due to this mutation.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping