title: Familial reciprocal translocation t(7;16) associated with maternal uniparental disomy 7 in a Silver-Russell patient.
abstract: We present the case of a maternal heterodisomy for chromosome 7 in the daughter of a t(7;16)(q21;q24) reciprocal translocation carrier. The proband was referred to the hospital for growth retardation and minor facial dysmorphism without mental retardation. A diagnosis of Silver-Russell syndrome was suspected. Chromosomal analysis documented a 46,XX,t(7;16)(q21;q24)mat chromosome pattern. Microsatellite analysis showed a normal biparental inheritance of chromosome 16 but a maternal heterodisomy of chromosome 7. Occurrence of uniparental disomy (UPD) is a well-recognized consequence of chromosomal abnormalities that increase the rate of meiotic nondisjunction, mainly Robertsonian translocations and supernumerary chromosomes. Although reciprocal translocations should, theoretically, be also at increased risk of UPD, only three cases have been reported so far. However, because the association between uniparental disomy and reciprocal translocation may exist with an underestimated frequency, prenatal diagnosis is recommended when clinically relevant chromosomes for UPD are involved.
authors.affiliation: Histologie Embryologie Cytogénétique, CHU Cochin, AP-HP-Université Paris 5, France. jean-michel.dupont@cch.ap-hop-paris.fr
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Dupont
authors.forename: Laurence
authors.initials: L
authors.lastname: Cuisset
authors.forename: Maryse
authors.initials: M
authors.lastname: Cartigny
authors.forename: Dominique
authors.initials: D
authors.lastname: Le Tessier
authors.forename: Christian
authors.initials: C
authors.lastname: Vasseur
authors.forename: Didier
authors.initials: D
authors.lastname: Rabineau
authors.forename: Marc
authors.initials: M
authors.lastname: Jeanpierre
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D002648:Child; D002885:Chromosomes, Human, Pair 16; D002897:Chromosomes, Human, Pair 7; D005260:Female; D006801:Humans; D014178:Translocation, Genetic; D024182:Uniparental Disomy