Clinical characteristics of 16 patients with nucleotide excision repair disorders and literature review / 中华实用儿科临床杂志

ABSTRACT

Objective:To summarize the clinical manifestations and gene mutation features of patients with nucleotide excision repair (NER) disorders.Methods:A retrospective analysis was made on clinical data of patients with NER disorders who were admitted to the Chinese People′s Liberation Army General Hospital from October 2008 to February 2022 and diagnosed in the Outpatient Department of Beijing Children′s Hospital, Capital Medical University from October 2015 to February 2022.Literature on previously reported Chinese patients with NER disorders was reviewed.Results:(1)A total of 16 patients with NER disorders were enrolled, including 6 males and 10 females.The onset age was 7.5 (4.0, 12.0) months and the age at diagnosis was 42.0 (21.5, 77.0) months.There were 3 types of NER disorders: Cockayne syndrome (CS) in 13 cases, Xeroderma Pigmentosum (XP) in 2 cases and Cerebro-Oculo-Facio-Skeletal syndrome (COFS) in 1 case.Four disease-causing genes were detected: CSA gene in 11 cases, CSB gene in 3 cases, XPG gene in 1 case, and XPD gene in 1 case.The first symptoms of the 16 patients were photosensitivity and developmental delay, and neurological symptoms were observed in all the 3 NER disorder types.XP and CS patients had skin symptoms.CS patients presented typical facial features, visual and auditory impairment, microcephaly and changes in neuroimaging features.COFS patients showed intrauterine growth retardation.(2)Results of literature review: a total of 96 Chinese patients reported were retrieved, involving 6 disease types, including CS in 45 cases, XP in 44 cases, trichothiodystrophy in 4 cases, COFS in 1 case, XP-CS in 1 case, and ultraviolet sensitive syndrome in 1 case.Nine mutated genes were identified: CSA in 33 cases, XPA in 15 cases, CSB in 13 cases, XPV in 10 cases, XPC in 9 cases, XPG in 7 cases, XPD in 7 cases, XPF in 1 case, and MPLKIP in 1 case.The common symptoms were growth failure (62 cases), skin photosensitivity (61 cases), typical facial features (52 cases), mental retardation (49 cases) and microcephaly (48 cases). Among 36 cases had imaging data 33 cases(91.7%)had calcification of basal nucleus or globus pallidus.Three cases had intrauterine growth retardation and microcephaly during pregnancy. Conclusions:Patients with such prenatal manifestations as intrauterine growth retardation and microcephaly or with typical symptoms like skin photosensitivity, typical facial features, growth failure, mental retardation, hypertonia, and calcifications of basal ganglia should be suspected of NER disorders.Early genetic testing is recommended to confirm the diagnosis.