alexa Ring chromosome 21 and reproductive pattern: a familial case and review of the literature.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Genetic Syndromes & Gene Therapy

Author(s): Bertini V, Valetto A, Uccelli A, Tarantino E, Simi P

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Abstract OBJECTIVE: To characterize a ring chromosome 21 found in an infertile woman and in her mother. DESIGN: Case report. SETTING: Molecular and cytogenetics unit in a university-affiliated hospital. PATIENT(S): A 32-year-old infertile woman, presenting a normal female phenotype without clinical signs or major dysmorphisms. INTERVENTION(S): Molecular cytogenetic analyses and genetic counseling. MAIN OUTCOME MEASURE(S): Structure of chromosome ring 21 (r21) was better defined by fluorescent in situ hybridization and array comparative genomic hybridization. RESULT(S): Proband chromosomal analysis detected a mosaicism with three cell lines: one with a chromosome ring 21 (94\%), one 45,XX, -21 (4\%), and one with a dicentric ring (2\%). This ring was inherited from her mother, whose karyotype was 46,XX, r(21)/45,XX, -21 [98\%, 2\%]. In both cases, the ring breakpoint was in band 21q22.3, with a deletion of about 3.4 Mb. CONCLUSION(S): When a new case of r(21) is found, an accurate molecular definition of the deletion extent is mandatory and prenatal diagnosis should be suggested in case of pregnancy. Even if a strict genotype-phenotype correlation is not easy, mainly owing to a paucity of molecularly defined cases and to the mosaicism problems, prenatal investigations allow excluding chromosome 21 nondisjunction or rearrangements of r(21) that can have a dramatic effect on the fetus phenotype. This article was published in Fertil Steril and referenced in Journal of Genetic Syndromes & Gene Therapy

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