Recurrent proximal 18p monosomy and 18q trisomy in a family with a maternal pericentric inversion of chromosome 18

Prabhakara, Karthik S.; Wyandt, Herman E.; Huang, Xin; Prasad, Kavya; Ramadevi, A. Radha

doi:10.1016/j.anngen.2004.03.007

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…A recurrent case of chromosome 18 inversion [46,XY,+18,der(18;inv (18))(q10;q10)] was also described as a result of a maternal germinal mosaic. 11 Finally, two recurrent deletions [del(16)(q11.3q12.2) and del(22)(q13.3qtel)] were reported. 18,19 With regard to male mosaics, another study reported sibling propositus with chromosome 14 structural abnormalities as a consequence of father testicular mosaicism, 12 and two more cases of recurrent paternal deletions on chromosomes 11 and 13 were described.…”

Section: Discussionmentioning

confidence: 99%

“…[9][10][11][12][13][14][15][16][17][18][19] Indeed, five studies reported structural abnormality with a maternal mosaicism origin. 9,10,11,18,19 Engel et al 9 reported a familial pseudodicentric chromosome (5;21) occurring on maternal germline mosaicism as revealed by microsatellite marker analysis. Another study described sibling cases with a subtelomeric 5.8 Mb deletion on chromosome 15 as a result of maternal germinal mosaicism 10 using microarray CGH and polymorphic marker analysis.…”

Section: Discussionmentioning

confidence: 99%

“…Germinal mosaicism is independent of maternal age. 2 Few studies in literature have described germinal mosaicism corresponding essentially to aneuploidies and structural chromosomal aberrations including mostly isochromosomes and deletions [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] (for review, see Röthlisberger and Kotzot 20 ).…”

Section: Introductionmentioning

confidence: 99%

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Recurrent 70.8 Mb 4q22.2q32.3 duplication due to ovarian germinal mosaicism

et al. 2010

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A mosaicism is defined by the presence of two or more populations of cells with different genotypes in one individual. Chromosomal germinal mosaicism occurs in germ cells before the onset of meiosis. Previously, few studies have described germinal mosaicism. In this study, we report on two siblings who carried identical pure and direct interstitial 4q22.2q32.3 duplication. Procedure investigations included complete clinical description, conventional cytogenetic analysis, fluorescence in situ hybridization (FISH), comparative genomic hybridization (CGH) array experiments and microsatellite study searching for parental origin of the duplication. Microarray CGH and further FISH experiments with BAC clones showed the same 70.8 Mb direct duplication, dup(4)(q22.2q32.3). Molecular studies of the 4q duplication were consistent with maternal origin associated with mitotic or meiotic rearrangements. This structural chromosomal aberration was associated in both cases with increased nuchal translucency, growth retardation and dysmorphy. Cardiopathy and lung malformations were only evident in the first case. These clinical manifestations are similar to those previously reported in previous studies involving pure 4q trisomy of the same region, except for thumb and renal abnormalities that were not obvious in the presented cases. The amplified region included genes involved in neurological development (NEUROG2, MAB21L2, PCDH10/18 and GRIA2). The recurrent 4q duplication in these siblings is consistent with a maternal ovarian germinal mosaicism. This is the first description of germinal mosaicism for a large chromosomal duplication and highlights that genetic counselling for apparently de novo chromosome aberration should be undertaken with care.

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