[Identification of a novel TP53 germline mutation in one child with adrenocortical carcinoma]
Nuo Si1, Miao Sun, Chao-xia Lu
1Department of Medical Genetics, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China.
Objective:
To detect the germline TP53 gene mutation in a child with pediatric adrenocortical carcinoma (ADCC) in order to provide genetic diagnosis and counseling.
Methods:
Genomic DNA was extracted from peripheral blood from a girl with ADCC and her parents. All TP53 exons and their flanking intronic sequences were PCR-amplified and subjected to automatic DNA sequencing.
Results:
Direct sequencing of PCR products revealed a heterozygous G insertion between nucleotide 522 and 523 (c.522-523insG) in TP53 exon 5. This novel mutation is predicted to result in a frame shift at codon 175, producing a new reading frame ending in a stop at position 6 (p.R175AfsX6). The same heterozygous mutation was also found in her father, but not in her mother.
Conclusion:
A novel germline mutation in the TP53 gene has been identified in one case with pediatric ADCC.
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