Monosomy 9p24 in two non-related patients as result of a translocation (2;9).

Abstract:

:In patients with malformations and delayed psychomotor development it is important to discard chromosomopathies. Balanced reciprocal translocations are the most frequent chromosomopathies present in 1:500 live newborns. In general, carriers have normal phenotype, but they may have infertility, abortions or children with congenital malformations. The reciprocal translocation between chromosomes 2 and 9 can lead to offspring with monosomies and trisomies of these chromosomes. Short arm monosomy of chromosome 9 may present delayed psychomotor development, trigonocephaly, facial dysmorphia and genital abnormalities. We reviewed GTG karyotype records from our Institution to identify cases with chromosomes 2 and/or 9 alterations from 2005 to 2014. We describe two cases with monosomy 9p secondary to a translocation between chromosomes 2 and 9. The patients share features of monosomy 9p24-pter, however the genotypephenotype correlation is complex due to the extension of the involved segments. We emphasize the importance of chromosomal diagnosis to offer genetic assessment. :En pacientes con malformaciones congénitas y retraso del desarrollo psicomotor, deben descartarse cromosomopatías. Las más frecuentes son las translocaciones recíprocas balanceadas, presentes en 1:500 recién nacidos vivos. Por lo general, los portadores tienen fenotipo normal, aunque, ocasionalmente, presentan infertilidad, abortos o hijos con malformaciones. La translocación balanceada entre los cromosomas 2 y 9 puede originar descendencia con monosomías y trisomías de estos cromosomas. La monosomía del brazo corto del cromosoma 9 puede presentarse con trigonocefalia, dismorfias faciales, anomalías genitales y retraso del desarrollo psicomotor. En este trabajo, se revisaron las alteraciones de los cromosomas 2 y/o 9 en los cariotipos realizados en nuestra Institución en 2005-2014. Se presentan dos pacientes con monosomía 9p asociada a translocación (2;9). Las pacientes comparten datos de monosomía 9p24-pter; la correlación genotipo-fenotipo es compleja por el tamaño de los segmentos involucrados. Se resalta la importancia del diagnóstico cromosómico para el asesoramiento genético.

journal_name

Arch Argent Pediatr

authors

León-Carlos NY,García-Delgado C,Morales-Jiménez AB,Serrano-Bello C,Cervantes A,Morán Barroso VF

doi

10.5546/aap.2018.e603

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

e603-e608

issue

4

eissn

0325-0075

issn

1668-3501

journal_volume

116

pub_type

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