Normal phenotype and partial trisomy for the G positive region of chromosome 21.
نویسنده
چکیده
A prenatally diagnosed male fetus and his mother, who was referred because of her advanced age, both carried an abnormal bisatellited chromosome 21 as an extra chromosome. The abnormal 21 was monocentric and the G negative band q22 and part of q21 had been deleted during formation. The phenotype of both the mother and child (at birth) was normal.
منابع مشابه
Tetrasomy 21pterRq21.2 in a male infant without typical Down’s syndrome dysmorphic features but moderate mental retardation
D own’s syndrome is caused by trisomy of chromosome 21. This invariably results in cognitive impairment, hypotonia, and characteristic phenotypic features such as flat facies, upslanting palpebral fissures, and inner epicanthal folds, and variations in digits and the ridge formation on hands and feet. Furthermore, trisomy 21 is a risk factor for congenital heart disease, Hirschsprung’s disease,...
متن کاملTetrasomy 21pter-->q21.2 in a male infant without typical Down's syndrome dysmorphic features but moderate mental retardation.
D own’s syndrome is caused by trisomy of chromosome 21. This invariably results in cognitive impairment, hypotonia, and characteristic phenotypic features such as flat facies, upslanting palpebral fissures, and inner epicanthal folds, and variations in digits and the ridge formation on hands and feet. Furthermore, trisomy 21 is a risk factor for congenital heart disease, Hirschsprung’s disease,...
متن کاملDown syndrome: characterisation of a case with partial trisomy of chromosome 21 owing to a paternal balanced translocation (15;21) (q26;q22.1) by FISH.
A patient with a typical Down syndrome (DS) phenotype and a normal karyotype was studied by FISH. Using painting probes, we found that the patient had partial trisomy of chromosome 21 owing to an unbalanced translocation t(15;21) (q26; q22.1) of paternal origin. To correlate genotype with phenotype as accurately as possible, we localised the breakpoint using a contig of YACs from the long arm o...
متن کاملMolecular characterisation of partial chromosome 21 aneuploidies by fluorescent PCR.
Although trisomy of chromosome 21 is the most prevalent human genetic disorder, data from partial 21 aneuploidies are very scanty. Eight different partial aneuploidies for chromosome 21 were characterised by fluorescence quantitative PCR. Allelic dosage analysis was performed for each patient using 25 CHLC STRs covering the entire q arm. The length of the corresponding trisomies and monosomies ...
متن کاملApplication of Molecular DNA Markers (STRs) in Molecular Diagnosis of Down Syndrome in Iran
Down syndrome is one of the most common causes of mental retardation observed in approximately 1/700 live birth. The use of two or more STR markers related to chromosome 21 facilitates the diagnosis of Down syndrome within about six hours from the collection of the samples. This is the first study has been performed in Iranian population to assess the diagnostic value of using small tandem repe...
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ورودعنوان ژورنال:
- Journal of medical genetics
دوره 16 3 شماره
صفحات -
تاریخ انتشار 1979