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[Chromosomal mosaicism in the placenta].

G H Schuring-Blom¹

¹Academisch Medisch Centrum/Universiteit van Amsterdam, afd. Klinische Genetica, Meibergdreef 15, 1105 AZ Amsterdam. g.h.schuring@amc.uva.nl

Nederlands Tijdschrift Voor Geneeskunde

|January 22, 2003

Summary

Chromosomal mosaicism involves different cell lines within one individual, potentially impacting prenatal diagnosis. Confined placental mosaicism can affect fetal development, but its role in intrauterine survival remains unclear.

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Area of Science:

Genetics
Reproductive Biology
Prenatal Diagnosis

Context:

Chromosomal mosaicism occurs when an individual has cell lines with differing chromosome complements.
This phenomenon can be present in all tissues or confined to specific ones, such as the placenta during pregnancy.
Confined placental mosaicism (CPM) is a specific form where abnormal cells are restricted to the placenta.

Purpose:

To explore the implications of chromosomal mosaicism, particularly confined placental mosaicism, in prenatal diagnosis.
To investigate the potential effects of CPM on fetal development and intrauterine survival.
To clarify the role of placental cell lines in cases of fetal trisomy.

Summary:

Chromosomal mosaicism, where different cell lines coexist, can be confined to the placenta (CPM).
CPM can complicate prenatal diagnosis via chorionic villus sampling, sometimes requiring amniocentesis for confirmation.
While CPM can range from asymptomatic to causing severe fetal issues, its role in intrauterine survival, especially in trisomy cases, is debated and was not supported by this study.

Impact:

Highlights diagnostic challenges posed by confined placental mosaicism in prenatal testing.
Underscores the variable impact of CPM on fetal development, contingent on the specific chromosome involved.
Challenges previous hypotheses regarding the protective role of diploid placental cells in fetal trisomy survival.

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