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4p- phenotype in an infant with t(4p-;19p or q+)mat translocation
Insights
A rare chromosomal translocation, t(4p-;19p or q+), was identified in four family members. One infant presented with a 4p- phenotype, suggesting a loss of essential developmental genes.
Area of Science:
- Genetics
- Human genetics
- Cytogenetics
Background:
- Balanced translocations can segregate abnormally during meiosis.
- Chromosomal abnormalities are a significant cause of congenital anomalies.
Observation:
- Four family members exhibited an apparently balanced t(4p-;19p or q+) translocation.
- One male infant presented with a severe 4p- phenotype.
Findings:
- The infant's phenotype included seizures, cleft palate, dysmorphic features, hypospadias, and simian creases.
- The 4p- phenotype is attributed to the loss of crucial 4p material.
Implications:
- This case suggests "aneusomy by recombination" as a mechanism for 4p- syndrome.
- Understanding translocation segregation is vital for genetic counseling.
Abstract:
Four family members had an apparently balanced t(4p-;19p or q+) translocation indentified by Giemsa banding. One of these individuals, a male infant, has a 4p- phenotype with seizures, large bilateral cleft palate, abnormal anterior fontanel, abnormally shaped ears, hypertelorism, small penis with third-degree hypospadias, and bilateral simian creases. It is theorized that 4p material containing loci essential for normal development was lost in this infant by a simple deletion or "aneusomy by recombination."