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Partial duplication 16p resulting from a 3:1 segregation of a maternal reciprocal translocation
American Journal of Medical Genetics
|January 1, 1987
Insights
This study reports a rare unbalanced karyotype in a male infant with duplication 9p and duplication 16p. This genetic condition resulted from a maternal reciprocal translocation and 3:1 meiotic disjunction.
Area of Science:
- Genetics
- Human Genetics
- Reproductive Genetics
Background:
- Reciprocal translocations can lead to unbalanced karyotypes during meiosis.
- Meiotic errors like 3:1 disjunction can result in complex chromosomal abnormalities.
Observation:
- A male infant presented with a rare unbalanced karyotype: duplication 9p (pter----q13) and duplication 16p (p13----pter).
- The karyotype arose from a maternal reciprocal translocation.
- The meiotic segregation pattern aligns with the Pachytene-Diagram Model.
Findings:
- This specific combination of duplications (dup(9p) and dup(16p)) is reported for the first time.
- The infant exhibited clinical features consistent with both dup(16p) and dup(9p).
Implications:
- This case expands the understanding of chromosomal abnormalities resulting from maternal translocations.
- It highlights the phenotypic variability associated with complex duplications.
- Further research into similar karyotypes may refine genotype-phenotype correlations.
Abstract:
We report on a male infant with a duplication 9p (pter----q13) and duplication 16p (p13----pter) resulting from a 3:1 meiotic disjunction of a maternal reciprocal translocation. In this case, the mode of segregation fits to the Pachytene-Diagram Model of Jalbert et al [1980]. The infant showed clinical features that have been described both in dup(16p) and in dup(9p). To our knowledge, this is the first time that this unbalanced karyotype has been reported.