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A liveborn infant with tetraploidy
1Department of Pediatrics, Division of Genetics, Nemours Children's Clinic, Jacksonville, FL 32247.
Insights
Tetraploidy, a rare genetic condition, can allow individuals to survive past 22 months, despite significant psychomotor delays. This case highlights the importance of understanding tetraploidy in genetic counseling and prenatal diagnosis.
Area of Science:
- Genetics
- Developmental Biology
- Pediatrics
Background:
- Tetraploidy is a rare chromosomal abnormality where a cell contains four sets of chromosomes instead of the usual two.
- Understanding the phenotypic spectrum of tetraploidy is crucial for accurate genetic counseling and prognosis.
Observation:
- A 22-month-old Caucasian female presented with tetraploidy.
- The child exhibited normal physical growth but severe psychomotor developmental delay.
Findings:
- This case demonstrates that individuals with tetraploidy can survive beyond infancy and early childhood.
- The observed phenotype includes significant neurodevelopmental impairment despite otherwise stable growth.
Implications:
- Findings are relevant for genetic counseling, informing parents about the potential for live birth and survival in rare tetraploidy cases.
- The case underscores the need for comprehensive prenatal diagnosis and long-term developmental monitoring for individuals with chromosomal abnormalities.
Abstract:
We report on an 22-month-old white girl with tetraploidy who is growing well, but who is extremely delayed in psychomotor development. When counseling parents it is important to realize that, although quite rare, tetraploid individuals can be born alive and live for at least 22 months. The implications are also relevant to prenatal diagnosis.