Individuals with Cri du Chat syndrome show phenotypic and cytogenetic variability. A few studies have been performed to correlate the clinical picture with the deletion size. A more severe phenotype and cognitive impairment was reported to be associated with a larger deletion [10]. Molecular-cytogenetic analysis identified three distinct regions, one for the typical cry in 5p15.3, and another for the facial dysmorphism in 5p15.2, the
third for the severe/moderate mental retardation and microcephaly in 5p14.2 [11]. The size of deletion of 5p14.2–>qter in this study was about 23.263-Mb. This case showed cat-like cry, facial dysmorphism, microcephaly, and heart defect. A genotype-phenotype correlation was confirmed. Mental retardation may present in his future development. In patients with an unbalanced translocation resulting in 5p deletion, the partial trisomy of the other involved chromosome may influence the clinical features, even if the Cri du Chat syndrome phenotype prevails [12]. Since its description in 1975, 12p trisomy syndrome has become recognized as a well defined, although rare syndrome. Typical features consist of mental retardation, peculiar flat face, broad, low-set ears, and flat nasal bridge [13]. Deletion of 5p14.2–>qter and distal trisomy of 12p13.1–>pter contributed to the clinical features of this case with Cri du Chatsyndrome.
Individuals with Cri du Chat syndrome show phenotypic and cytogenetic variability. A few studies have been performed to correlate the clinical picture with the deletion size. A more severe phenotype and cognitive impairment was reported to be associated with a larger deletion [10]. Molecular-cytogenetic analysis identified three distinct regions, one for the typical cry in 5p15.3, and another for the facial dysmorphism in 5p15.2, the
third for the severe/moderate mental retardation and microcephaly in 5p14.2 [11]. The size of deletion of 5p14.2–>qter in this study was about 23.263-Mb. This case showed cat-like cry, facial dysmorphism, microcephaly, and heart defect. A genotype-phenotype correlation was confirmed. Mental retardation may present in his future development. In patients with an unbalanced translocation resulting in 5p deletion, the partial trisomy of the other involved chromosome may influence the clinical features, even if the Cri du Chat syndrome phenotype prevails [12]. Since its description in 1975, 12p trisomy syndrome has become recognized as a well defined, although rare syndrome. Typical features consist of mental retardation, peculiar flat face, broad, low-set ears, and flat nasal bridge [13]. Deletion of 5p14.2–>qter and distal trisomy of 12p13.1–>pter contributed to the clinical features of this case with Cri du Chatsyndrome.
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