ABSTRACT
Trisomy 18 is usually a lethal chromosomal abnormality and is the second most common autosomal trisomy in humans, with an incidence of 1:8000 live births. It is commonly associated with abnormalities of the lower and upper extremities, having the frequency of 95% and 65%, respectively. A newborn female olive baboon (Papio hamadryas anubis) was diagnosed with intrauterine growth retardation and severe arthrogryposis-like congenital joint deformities. Cytogenetic analysis including G-banding and fluorescence in situ hybridization (FISH) revealed that the congenital abnormalities were associated with chromosomal mosaicism for trisomy 18. Genetic analysis with microsatellites from chromosome 18 confirmed the maternal origin of the extra chromosome 18. This is the first report of trisomy 18 in the baboon, which may be a promising animal model of human disease.
Subject(s)
Abnormalities, Multiple/veterinary , Monkey Diseases/genetics , Papio hamadryas/genetics , Trisomy , Abnormalities, Multiple/genetics , Animals , Animals, Newborn , Chromosome Aberrations , Chromosome Mapping , Chromosomes, Human , Chromosomes, Mammalian , Female , Humans , Male , PedigreeABSTRACT
A linkage analysis between the gene for von Recklinghausen neurofibromatosis (NF) and 21 genetic markers was carried out using the computer program LIPED. The study group included 15 families composed of 84 individuals, 51 of whom were affected with NF; there were six three-generation families and nine two-generation families. Lod scores excluded tight linkage (Z less than -2.0) between eight genetic markers and NF and were inconclusive for nine markers. Four markers were not informative. The analysis failed to confirm either the previously suggested linkage between NF and the plasma vitamin D-binding protein Gc or the possibility of linkage of NF to the secretor locus suggested by reports of two families segregating for NF and myotonic dystrophy.
