{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,11,22]],"date-time":"2023-11-22T09:53:17Z","timestamp":1700646797328},"reference-count":27,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2003,4,14]],"date-time":"2003-04-14T00:00:00Z","timestamp":1050278400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American J of Med Genetics Pt A"],"published-print":{"date-parts":[[2003,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Tetrasomy 8p is a rare chromosomal disorder that has only been detected in a mosaic form. At the present time, 11 cases have been reported; their phenotype included agenesis of the corpus callosum, enlarged ventricles, minor facial dysmorphism, rib and vertebral anomalies, and mild to moderate developmental delay. To the best of our knowledge, tetrasomy 8p has never been prenatally diagnosed. This 43\u2010year\u2010old woman was referred for amniocentesis at 20 weeks' gestation because of advanced maternal age. Amniotic fluid cells were cultured according to standard techniques by the in situ method. A supernumerary chromosomal marker was detected in a single clone of cultured amniotic cells and interpreted by RHG banding as an isochromosome of the short arm of chromosome 8 (i(8p)). The ultrasound investigation at 27 weeks gestation revealed enlarged ventricles and agenesis of the corpus callosum, which were confirmed at fetal autopsy after medical termination of the pregnancy. Chromosomal analyses, including RHG banding and FISH, of several tissues showed different levels of i(8p) mosaicism. Whereas no i(8p) was detected on cytotrophoblast nor additional amniotic fluid cells, 97% and 30% of cells from long\u2010term cultures of placenta and lymphocytes, respectively, had the i(8p). Using DNA markers, the isochromosome 8p was interpreted as the result of a prezygotic event during maternal meiosis. Our findings suggest that the i(8p) is the subject of tissue selection. Tetrasomy 8p might be underdiagnosed during pregnancy; therefore, karyotyping on a fetal blood sample following detection of agenesis of the corpus callosum when no chromosomal abnormality has been found on the amniotic fluid cell cultures should be discussed with the parents. \u00a9 2003 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajmg.a.20199","type":"journal-article","created":{"date-parts":[[2003,6,4]],"date-time":"2003-06-04T10:07:08Z","timestamp":1054721228000},"page":"44-48","source":"Crossref","is-referenced-by-count":7,"title":["Prenatal diagnosis of mosaic tetrasomy 8p"],"prefix":"10.1002","volume":"120A","author":[{"given":"Marie\u2010Jos\u00e9e","family":"Le 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