De novo ring chromosome 6 in a child with multiple congenital anomalies. 2010

Hadi Ahmad Ahzad, and Siti Fatimah Ramli, and Tan May Loong, and Iman Salahshourifar, and Bin Alwi Zilfalil, and Narazah Mohd Yusoff
Human Genetics Unit, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Lot 29, Taman Bertam Indah, Kepala Batas, Penang, Malaysia.

Ring chromosome 6, especially if it is de novo, is a rare occurrence. The phenotype of patients with ring chromosome 6 can be highly variable ranging from almost normal to severe malformations and mental retardation. The size and structure of the ring chromosome as well as the level of mosaicism are important factors in determining the clinical phenotype. Here we report an eight month-old child, a product of a non consanguineous marriage, who presented with developmental retardation, hypertelorism, microcephaly, flat occiput, broad nasal bridge, large ears, micrognathia, wide spaced nipples, protruding umbilicus, short stubby fingers, clinodactyly, single palmar crease, short neck with no obvious webbing, and congenital heart defect. Conventional karyotyping and Whole Chromosome Paint of the peripheral leukocytes showed 46,XY,r(6)(p25q27) karyotype with plausible breakpoints at p25 and q27 end. Conventional karyotyping of both parents showed normal karyotype. To the best of our knowledge, this is the first report of a Malay individual with ring chromosome 6, and this report adds to the collective knowledge of this rare chromosome abnormality.

UI MeSH Term Description Entries
D007223 Infant A child between 1 and 23 months of age. Infants
D007621 Karyotyping Mapping of the KARYOTYPE of a cell. Karyotype Analysis Methods,Analysis Method, Karyotype,Analysis Methods, Karyotype,Karyotype Analysis Method,Karyotypings,Method, Karyotype Analysis,Methods, Karyotype Analysis
D008297 Male Males
D010641 Phenotype The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment. Phenotypes
D002896 Chromosomes, Human, Pair 6 A specific pair GROUP C CHROMSOMES of the human chromosome classification. Chromosome 6
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000015 Abnormalities, Multiple Congenital abnormalities that affect more than one organ or body structure. Multiple Abnormalities
D012303 Ring Chromosomes Aberrant chromosomes with no ends, i.e., circular. Chromosomes, Ring,Chromosome, Ring,Ring Chromosome
D020223 Chromosome Painting A technique for visualizing CHROMOSOME ABERRATIONS using fluorescently labeled DNA probes which are hybridized to chromosomal DNA. Multiple fluorochromes may be attached to the probes. Upon hybridization, this produces a multicolored, or painted, effect with a unique color at each site of hybridization. This technique may also be used to identify cross-species homology by labeling probes from one species for hybridization with chromosomes from another species. Chromosome Paintings,Painting, Chromosome,Paintings, Chromosome
D025063 Chromosome Disorders Clinical conditions caused by an abnormal chromosome constitution in which there is extra or missing chromosome material (either a whole chromosome or a chromosome segment). (from Thompson et al., Genetics in Medicine, 5th ed, p429) Autosomal Chromosome Disorders,Chromosome Abnormality Disorders,Chromosomal Disorders,Autosomal Chromosome Disorder,Chromosomal Disorder,Chromosome Abnormality Disorder,Chromosome Disorder,Chromosome Disorder, Autosomal,Chromosome Disorders, Autosomal,Disorder, Chromosomal,Disorder, Chromosome,Disorder, Chromosome Abnormality,Disorders, Chromosomal,Disorders, Chromosome

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