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Williams-Beuren Syndrome is a rare neurodevelopmental disorder caused by a 1.5–1.8 Mb hemizygous deletion at chromosome 7q11.23, occurring in approximately 1 in 7,500–10,000 live births worldwide. 📍Key Takeaways 1. Etiology: 7q11.23 Deletion and Genetic Mechanism WBS results from a hemizygous deletion of approximately 26–28 genes at chromosome 7q11.23, including ELN (elastin), LIMK1, and GTF2I. Haploinsufficiency…

In clinic, we frequently encounter patients like these: As we go through the diagnostic workup—CMA, single gene tests, targeted panels—there are still many cases where we fail to reach a definitive diagnosis. This is often referred to as the “diagnostic journey.” The Direction Was Already Set in 2021 There is an important reference point for…

Is a single genetic test result the end of the diagnostic journey?At 3billion, we believe diagnosis is an ongoing process. That’s why we focus not only on the test itself, but on what comes after:Reanalysis. For all cases previously reported as Inconclusive or Negative,3billion performs automated reanalysis through a continuous system.Each month, dozens of reports…

📍 Key Takeaways 1. What is CCD: Core Clinical Phenotypes  Cleidocranial Dysplasia (CCD) is an autosomal dominant rare skeletal dysplasia caused by RUNX2 gene variants, with a reported birth prevalence of approximately 1/1,000,000.[1] A systematic review of 283 CCD patients found dental anomalies — including supernumerary teeth and permanent tooth eruption failure — in over…

📍Key Takeaways A Well-Characterized Syndrome With Much Still to Learn CHARGE syndrome is a rare, complex congenital disorder most commonly caused by pathogenic variants in the CHD7 gene. The acronym reflects its cardinal features: Coloboma, Heart defect, Atresia of the choanae, Retardation of growth, Genital hypoplasia, and Ear anomaly/deafness. CHD7 was identified as the causative…

📍 Key Takeaways • More than 50% of CNS and infantile NS cases have a monogenic cause; four genes — NPHS1, NPHS2, WT1, and LAMB2 — account for two-thirds of all cases.  • Even within the same gene, earlier onset (CNS) is associated with a more severe genotype and faster progression to renal failure.  •…

In 2025, 825 patients received rare disease diagnoses through 3billion in Mexico. Rare disease patients wait an average of 4 to 6 years(Fatoumata Faye, 2024) before receiving an accurate diagnosis. Most spend years cycling through dozens of hospitals and undergoing countless repeated tests, only to be told the cause remains unknown. Mexico is no exception…

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…