Joubert syndrome (JBTS) is a class of heterogeneous ciliopathy genetically associated with CPLANE1 mutations. The characteristics of clinical phenotypes and CPLANE1 variants were analyzed in a 2-month-old patient. A 2-month-old patient with JBTS was diagnosed after clinical evaluation including family history, physical examination, cerebral MRI, ultrasonography imaging, VEGG, ocular fundus examination, and comprehensive blood and urine testing. Whole exome sequencing (WES) was performed to detect CPLANE1 variants, and Sanger sequencing was used to confirm the variants. This JBTS patient presented with oculomotor apraxia, dysregulation of breathing pattern, and ataxia. MRI revealed poor continuity of cerebelli, batwing appearance, and molar tooth sign. This patient was noted with abnormal hematology, dysregulation of hepatic function, thyroid function, immunity, and renal function, and encephalopathy. CPLANE1 (c.8948dupT (p.P2984Tfs*7) and c.247G > T (p.G83X)) variants were noticed in the patient as a pathogenic variant and caused autosomal recessive inheritance. The JBTS patient with mutations in CPLANE1 (c.8948dupT (p.P2984Tfs*7) and c.247G > T (p.G83X)) developed JBTS phenotypes. The novel CPLANE1 c.8948dupT (p.P2984Tfs*7) variant will assist clinicians and geneticists in reaching a precise diagnosis for JBTS.
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