A possible centromeric 21/22 translocation as an alternative cause of nondisjunction in trisomy 21
نویسندگان
چکیده
منابع مشابه
Risk factors for nondisjunction of trisomy 21.
The leading cause of Down syndrome (DS) is nondisjunction of chromosome 21 occurring during the formation of gametes. In this review, we discuss the progress made to identify risk factors associated with this type of chromosome error occurring in oogenesis and spermatogenesis. For errors occurring in oocytes, the primary risk factors are maternal age and altered recombination. We review the cur...
متن کاملFamilial balanced translocation 4p+/17q- as a suggested cause of primary trisomy-21 Down's syndrome.
A case is presented in which a 4p+/17q- familial balanced reciprocal translocation in the mother produced a son with primary trisomy-21, as well as the structural chromosomal anomaly. A number of similar situations have been reported, suggesting that the two events are related. In practice, this (as well as other direct risks) should be taken into account when counseling those families in which...
متن کاملTrisomy 21: association between reduced recombination and nondisjunction.
To assess the association between recombination and nondisjunction of chromosome 21, we analyzed cytogenetic and DNA markers in 104 trisomy 21 individuals and their parents. Our DNA marker studies of parental origin were informative in 100 cases, with the overwhelming majority (94) being maternal in origin. This value is significantly higher than the 75%-80% maternal nondisjunction rate typical...
متن کاملLipid peroxidation in Down syndrome caused by regular trisomy 21, trisomy 21 by Robertsonian translocation and mosaic trisomy 21.
BACKGROUND It has been suggested that an increase in oxidative stress in individuals with Down syndrome (DS) may cause adverse effects in the cell membranes through the oxidation of polyunsatured fatty acids. METHODS We examined erythrocyte malondialdehyde (MDA) levels in 100 individuals of both sexes (34 males and 66 females) with DS, aged from newborn to 29 years. The cytogenetic analysis r...
متن کاملBrain tuberculoma, an unusual cause of stroke in a child with trisomy 21: a case report
BACKGROUND Tuberculosis remains a public health problem in developing countries and is associated with lethal central nervous system complications. Intracranial tuberculomas occur in 13% of children with neurotuberculosis. Patients with trisomy 21 have an increased risk for stroke, which usually stems from cardiovascular defects. CASE PRESENTATION We report a case of a 12-year-old Sudanese bo...
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ژورنال
عنوان ژورنال: Genetics in Medicine
سال: 1999
ISSN: 1098-3600,1530-0366
DOI: 10.1097/00125817-199901000-00103