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Lobar holoprosencephaly and Xq22 deletion
Genetic Counseling (Geneva, Switzerland)
|January 1, 1991
Summary
This study describes a fetus with holoprosencephaly and an Xq22 deletion, noting a clear link between brain abnormalities and facial features. However, the connection between the overall phenotype and the specific karyotype was not evident.
Area of Science:
- Medical Genetics
- Developmental Biology
- Fetal Medicine
Background:
- Holoprosencephaly (HPE) is a severe congenital brain malformation.
- Genetic factors, including chromosomal abnormalities, are implicated in HPE etiology.
- X chromosome abnormalities can lead to diverse developmental phenotypes.
Purpose of the Study:
- To report a case of lobar holoprosencephaly associated with an Xq22 deletion.
- To investigate the phenotypic correlation between cerebral defects and facial features.
- To evaluate the phenotypic-karyotypic correlation in this specific case.
Main Methods:
- Case presentation of a 20-week gestation female fetus.
- Detailed fetal examination focusing on neuroanatomy and facial morphology.
- Karyotyping to identify chromosomal abnormalities.
Main Results:
- The fetus presented with lobar holoprosencephaly and a deletion on the X chromosome at band q22 (Xq22 deletion).
- A positive correlation was observed between the observed cerebral defect and the fetus's facial features.
- No obvious correlation was found between the overall phenotype and the specific karyotypic finding.
Conclusions:
- This case highlights the complex relationship between specific genetic alterations and developmental outcomes.
- Phenotypic variability associated with Xq22 deletions can be significant.
- Further research is needed to elucidate the precise mechanisms linking Xq22 deletions to HPE and associated facial dysmorphisms.