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The phenotype of human triploidy.
Birth Defects Original Article Series
|January 1, 1974
Summary
Triploidy syndrome, a condition where infants have an extra set of chromosomes, often results in premature birth and very short lifespans. Key features include dysmaturity, hypotonia, and specific physical abnormalities.
Area of Science:
- Genetics and Developmental Biology
- Perinatology
Background:
- Triploidy is a chromosomal abnormality characterized by the presence of three sets of chromosomes instead of the usual two.
- This condition is incompatible with long-term survival, with most affected infants being stillborn or dying shortly after birth.
Observation:
- Affected infants exhibit general dysmaturity and a range of congenital anomalies.
- Commonly observed features include muscular hypotonia, a large placenta often with hydatidiform changes, and specific facial dysmorphies such as hypertelorism and microphthalmia.
Findings:
- Syndactyly (cutaneous syndactyly of fingers three and four), simian crease, and maldeveloped external genitalia are frequently noted.
- Genitourinary anomalies include hypospadias and cryptorchidism in males, with Leydigian cell hyperplasia observed in XXY males.
- Adrenal hypoplasia is also a characteristic finding.
Implications:
- Understanding the phenotypic spectrum of triploidy is crucial for accurate diagnosis and genetic counseling.
- Further research into the genetic and molecular mechanisms underlying triploidy can provide insights into early development and chromosomal abnormalities.