Case Report: Identification of a de novo Microdeletion 1q44 in a Patient With Seizures and Developmental Delay

• Authors: Yiehen Tung, Nanjing Medical University; Haiying Lu, Nanjing Medical University; Wenxin Lin, Nanjing Medical University; Tingting Huang, Nanjing Medical University; Samuel Kim, Emory University; Guo Hu, Nanjing Medical University; Gang Zheng, Nanjing Medical University; Guo Zheng, Nanjing Medical University
• Journal Title: FRONTIERS IN GENETICS
• Volume: Volume 12
• Publisher: FRONTIERS MEDIA SA | 2021-05-20, Pages 648351-648351
• Type of Work: Article | Final Publisher PDF
• Publisher DOI: http://doi.org/10.3389/fgene.2021.648351
• Subjects: Health Sciences, Medicine and Surgery
• Keywords: Science & Technology; Life Sciences & Biomedicine; Genetics & Heredity; 1q44 microdeletion syndrome; copy number variation; whole exon sequencing; seizure; developmental delay; CORPUS-CALLOSUM; CANDIDATE GENES; INTELLECTUAL DISABILITY; DYSMORPHIC FEATURES; DELETION; 1Q43Q44; PHENOTYPES; MUTATIONS; REGION; ZBTB18

Abstract

Objective: 1q44 microdeletion syndrome is difficult to diagnose due to the wide phenotypic spectrum and strong genetic heterogeneity. We explore the correlation between the chromosome microdeletions and phenotype in a child with 1q44 microdeletion syndrome, we collected the clinical features of the patient and combined them with adjacent copy number variation (CNV) regions previously reported. Methods: We collected the full medical history of the patient and summarized her clinical symptoms. Whole-exome sequencing (WES) and CapCNV analysis were performed with DNA extracted from both the patient's and her parents' peripheral blood samples. Fluorescent quantitative PCR (q-PCR) was performed for the use of verification to the CNV regions. Results: A 28.7 KB microdeletion was detected in the 1q44 region by whole-exome sequencing and low-depth whole-genome sequencing. The deleted region included the genes COX20 and HNRNPU. As verification, karyotype analysis showed no abnormality, and the results of qPCR were consistent with that of whole-exome sequencing and CapCNV analysis. Conclusion: The patient was diagnosed with 1q44 microdeletion syndrome with clinical and genetic analysis. Analyzing both whole-exome sequencing and CapCNV analysis can not only improve the diagnostic rate of clinically suspected syndromes that present with intellectual disability (ID) and multiple malformations but also support further study of the correlation between CNVs and clinical phenotypes. This study lays the foundation for the further study of the pathogenesis of complex diseases.