Germline mosaicism is a pitfall in the diagnosis of "sporadic" X-linked Alport syndrome.

Abstract excerpt

Approximately 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...

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