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Research has shown gene ATN1 to be associated with the nuclear receptor signaling. Its mutations in an evolutionarily conserved histidine-rich motif may cause CHEDDA, short for congenital hypotonia, epilepsy, developmental delay and digital anomalies, a recently identified neurodevelopmental syndrome that could evolve into developmental and epileptic encephalopathy (DEE). Up to date, there have been reported less than 20 cases, whose clinical features and treatment are worth in-depth exploring.