A paternally transmitted complex chromosomal rearrangement (CCR) involving chromosomes 2, 6, and 18 includes eight breakpoints and five insertional translocations (ITs) through three generations.
Complex chromosomal rearrangements (CCRs) are uncommon and mainly occur de novo. We report here on a familial CCR involving chromosomes 2, 6, and 18. The propositus is a boy first referred because of growth delays, hypotonia, and facial anomalies, suggestive of deletion 18q syndrome. However, a cytogenetic family study disclosed a balanced CCR in three generations, which was detailed by FISH using BAC clones, and consisted of eight breakpoints with five insertional translocations (ITs). The propositus had a cryptic 18q deletion and a 6p duplication. Paternal transmission of this CCR was observed through three generations without meiotic recombination. Our investigation allowed us to provide porosities counseling and management of prenatal diagnosis for propositus cousin who carries this particular CCR.
Gruchy
Nicolas
N
Laboratoire de cytogénétique prénatale niveau 3, Centre Hospitalier Universitaire de Caen, Avenue Côte de Nacre, 14033 Caen Cedex, France. gruchy-n@chu-caen.fr
Barreau
Morgane
M
Kessler
Ketty
K
Gourdier
Dominique
D
Leporrier
Nathalie
N
D043283:Chromosome Fragile Sites; D022202:Chromosomes, Artificial, Bacterial; D002887:Chromosomes, Human, Pair 18; D002889:Chromosomes, Human, Pair 2; D002896:Chromosomes, Human, Pair 6; D005260:Female; D018392:Genomic Imprinting; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D010375:Pedigree; D032681:Spectral Karyotyping; D014178:Translocation, Genetic