Molecular analysis of chromosome 21 in a patient with a phenotype of down syndrome and apparently normal karyotype
- Uppsala Univ. (Sweden); and others
Down syndrome (DS) is caused in most cases by the presence of an extra chromosome 21. It has been shown that the DS phenotype is produced by duplication of only a small part of the long arm of chromosome 21, the 21q22 region, including and distal to locus D21S55. We present molecular investigations on a woman with clinically typical DS but apparently normal chromosomes. Her parents were consanguineous and she had a sister with a DS phenotype, who died at the age of 15 days. Repeated cytogenetic investigations (G-banding and high resolution banding) on the patient and her parents showed apparently normal chromosomes. Autoradiographs of quantitative Southern blots of DNAs from the patient, her parents, trisomy 21 patients, and normal controls were analyzed after hybridization with unique DNA sequences regionally mapped on chromosome 21. Sequences D21S59, D21S1, D21S11, D21S8, D21S17, D21S55, ERG, D21S15, D21S112, and COL6A1 were all found in two copies. Fluorescent in situ hybridization with a chromosome 21-specific genomic library showed no abnormalities and only two copies of chromosome 21 were detected. Nineteen markers from the critical region studied with polymerase chain reaction amplification of di- and tetranucleotide repeats did not indicate any partial trisomy 21. From his study we conclude that the patient does not have any partial submicroscopic trisomy for any segment of chromosome 21. It seems reasonable to assume that she suffers from an autosomal recessive disorder which is phenotypically indistinguishable from DS. 23 refs., 6 figs., 3 tabs.
- OSTI ID:
- 478398
- Journal Information:
- American Journal of Medical Genetics, Vol. 63, Issue 4; Other Information: PBD: 28 Jun 1996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BASIC STUDIES
PATIENTS
PHENOTYPE
HEREDITARY DISEASES
DOWNS SYNDROME
KARYOTYPE
MENTAL DISORDERS
CHROMOSOMAL ABERRATIONS
DETECTION
HUMAN CHROMOSOME 21
GENETIC MAPPING
DNA SEQUENCING
RECESSIVE MUTATIONS
BIOLOGICAL MARKERS
BANDING TECHNIQUES
DNA HYBRIDIZATION
IN-SITU HYBRIDIZATION
FLUORESCENCE
POLYMERASE CHAIN REACTION
GENETICS