Partial trisomy 12q: a clinically recognisable syndrome. Genetic risks associated with translocations of chromosome 12q.
A newborn child with an unusual facial appearance and multiple abnormalities was found to be trisomic for a large part of 12q as a result of adjacent 1 segregation of a familial translocation, t(9;12) (p24;q21.2). A combination of cytogenetic analysis, clinical features, and enzyme marker studies allows an accurate assessment of the breakpoints. Although trisomic for a considerably larger area of 12q than other reported cases, there are many similar features suggesting that trisomy 12q is a clinically recognisable syndrome. The frequency and mode of segregation of 12q translocations and their implications for genetic counselling are discussed.
D002869:Chromosome Aberrations / Q000235:genetics*; D025063:Chromosome Disorders; D002906:Chromosomes, Human, 6-12 and X; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010375:Pedigree; D012306:Risk; D013577:Syndrome; D014178:Translocation, Genetic; D014314:Trisomy