Ontology type: schema:ScholarlyArticle
2019-02
AUTHORSTakayuki Okamoto, Kandai Nozu, Kazumoto Iijima, Tadashi Ariga
ABSTRACTApproximately 80% of patients with Alport syndrome have X-linked Alport syndrome (XLAS), which is caused by mutations in the type IV collagen alpha 5 gene (COL4A5). In patients with XLAS, approximately 10-15% of COL4A5 mutations occur as spontaneous events. Here, we describe maternal germline mosaicism in a family of XLAS patients. Since our patient's parents showed normal urinary findings without COL4A5 mutation using genomic DNA isolated from peripheral leukocytes, the patient was initially diagnosed with "sporadic" XLAS. However, genetic analysis of the patient's sister with microscopic hematuria identified the same COL4A5 heterozygous mutation. Therefore, we concluded that our patient and the sister had XLAS caused by maternal germline mosaicism, not "sporadic" XLAS. Our case suggests that "sporadic" XLAS may in some patients be caused by the transmission of an abnormal allele from either parent with germline mosaicism in COL4A5. Germline mosaicism is thought to be rare, but we should consider that even asymptomatic parents of "sporadic" XLAS patients could carry a somatic and/or germline mosaicism. More cautious genetic counseling is advisable for all "sporadic" XLAS patients. Furthermore, urinalysis screening of "sporadic" XLAS patients' siblings is also important to enable an earlier detection of parental germline mosaicism. More... »
PAGES1-5
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