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Karyotype testing remains the gold-standard first-line diagnostic tool for confirming Down syndrome (DS). It reliably identifies Trisomy 21 and detects Robertsonian translocations, and in the majority of patients presenting with a typical phenotype, karyotyping alone is sufficient. That said, karyotyping has well-recognized structural limitations. Low-level mosaicism may go undetected with standard G-banding. Submicroscopic copy number…

📍Summary: Carriers of genetic diseases are not merely asymptomatic gene transmitters — depending on genetic and environmental factors, they can experience actual health symptoms, making personalized healthcare tailored to carriers a necessity. A recent article (February 15, 2026) challenged the conventional wisdom that carriers are ‘asymptomatic,’ drawing on specific diseases and carrier cases. Starting from…