Key Points A patient with a severe form of telomere biology disorder has compound heterozygous variants in TERT that interact functionally. The functional interaction between alleles explains the much more… Click to show full abstract
Key Points A patient with a severe form of telomere biology disorder has compound heterozygous variants in TERT that interact functionally. The functional interaction between alleles explains the much more extreme phenotype in the proband compared with his heterozygous parents.
               
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