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Familial hydrocephalus of prenatal onset
1Department of Human Genetics, Hadassah Medical Center, Hebrew University, Jerusalem, Israel.
Insights
Genetic counseling identified distinct inheritance patterns for prenatal onset hydrocephalus in Jewish and Arab families. X-linked inheritance affected males in Jewish families, while autosomal recessive traits were observed in Arab families.
Area of Science:
- Medical Genetics
- Pediatric Neurology
- Human Population Genetics
Background:
- Hydrocephalus, a condition characterized by excessive cerebrospinal fluid in the brain, can have prenatal onset.
- Understanding the genetic basis of hydrocephalus is crucial for accurate diagnosis and family counseling.
- Previous studies suggest varying inheritance patterns for congenital hydrocephalus across different populations.
Purpose of the Study:
- To investigate the genetic etiology and inheritance patterns of prenatal onset hydrocephalus.
- To analyze familial recurrence and identify potential genetic factors in distinct ethnic groups.
- To provide insights for genetic counseling in families with affected children.
Main Methods:
- Retrospective analysis of 14 families with multiple children diagnosed with prenatal onset hydrocephalus.
- Detailed family history collection and pedigree analysis.
- Clinical diagnosis of hydrocephalus and assessment of inheritance patterns (X-linked, autosomal recessive).
Main Results:
- Seven families exhibited X-linked hydrocephalus, primarily affecting males, with five families of Jewish origin.
- Eight families of Arab origin showed consanguineous parents, with at least one affected female in six families, suggesting autosomal recessive inheritance.
- Prenatal onset hydrocephalus appears to be a frequent condition among Palestinian Arabs, likely with an autosomal recessive pattern.
Conclusions:
- Distinct genetic mechanisms underlie prenatal onset hydrocephalus in the studied populations.
- X-linked inheritance is significant in Jewish families, while autosomal recessive inheritance is prevalent in Arab families.
- The findings highlight the importance of ethnic background in understanding hydrocephalus genetics and recurrence risks.
Abstract:
Fourteen families in which more than one child was diagnosed with hydrocephalus of prenatal onset were seen in our genetic counseling clinic. In 7 families only males were affected: in 2 X-linked hydrocephalus was diagnosed while X-linked inheritance was suspected in 3 other families. These 5 families were of Jewish origin. In the 8 families of Arab origin, the parents of the affected children were consanguineous. In 6 of these families at least one female was affected and the hydrocephalus was most probably inherited as an autosomal recessive trait. This type of hydrocephalus of prenatal onset appears to be frequent among Palestinian Arabs.