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Ante-natal counseling in phacomatoses
Dana Brabbing-Goldstein1,2,3, Shay Ben-Shachar4,5
1Genetic Institute, Tel Aviv Medical Center, Tel Aviv, Israel.
Summary
Phacomatoses are genetic neurocutaneous disorders. Prenatal and preimplantation genetic testing are crucial for family planning due to a 50% inheritance risk, despite ethical considerations.
Area of Science:
- Genetics
- Dermatology
- Neurology
Background:
- Phacomatoses are a group of inherited neurocutaneous disorders originating from embryonic ectoderm.
- Common types include neurofibromatosis (NF1, NF2) and tuberous sclerosis complex (TSC), typically inherited in an autosomal dominant pattern with variable expression.
Purpose of the Study:
- To review common phacomatoses, focusing on their genetic basis and inheritance patterns.
- To discuss prenatal and preimplantation diagnostic methods for these conditions.
Main Methods:
- Review of literature on phacomatoses genetics and inheritance.
- Description of prenatal diagnostic techniques such as chorionic villus sampling (CVS) and amniocentesis (AC).
- Explanation of preimplantation genetic testing (PGT) procedures.
Main Results:
- Phacomatoses are autosomal dominant disorders with high penetrance and variable expressivity.
- Effective treatments are lacking, making genetic diagnosis essential for reproductive choices.
Conclusions:
- Prenatal and preimplantation genetic testing are vital for family planning in phacomatosis cases, given the 50% risk of transmission.
- These diagnostic procedures, while important, involve technical and ethical considerations.
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