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Updated: May 23, 2026
06:38
In Vitro Modeling of Down Syndrome Neurogenesis Using Human-Induced Pluripotent Stem Cells
Published on: March 7, 2025
Summary
Trisomy 21, or Down syndrome, is a common chromosomal condition. Prenatal ultrasound can detect specific "soft markers" in fetuses, aiding in aneuploidy screening.
Area of Science:
- Prenatal diagnosis
- Genetics
- Obstetrics
Background:
- Trisomy 21 (Down syndrome) is the most frequent chromosomal abnormality in live births.
- Prenatal diagnosis relies on identifying fetal structural and non-structural abnormalities.
- Soft markers are nonspecific, transient sonographic findings associated with aneuploidy.
Purpose of the Study:
- To review commonly studied soft markers for aneuploidy in fetuses.
- To highlight sonographic findings indicative of Trisomy 21.
Main Methods:
- Review of established sonographic soft markers for fetal aneuploidy.
- Analysis of literature on Trisomy 21-associated ultrasound findings.
Main Results:
- Commonly identified soft markers include thickened nuchal fold, shortened long bones, and pyelectasis.
- Other markers are echogenic bowel, intracardiac focus, abnormal FMF angle, and Ductus venosus pathology.
- Choroid plexus cysts are also noted as potential soft markers.
Conclusions:
- Soft markers are valuable but nonspecific indicators in prenatal screening for Trisomy 21.
- Comprehensive ultrasound assessment is crucial for identifying fetuses at risk for aneuploidy.
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