Molecular basis of hexosamininidase a deficiency and pseudodeficiency in the Berks County Pennsylvania Dutch
| Autor: | Thaddeus E. Kelly, George H. Thomas, Beverly R. Akerman, Carol E. Dowling, Susan J. Hayflick, Emilie H. Mules, Roy A. Gravel |
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| Rok vydání: | 1992 |
| Předmět: |
Male
endocrine system DNA Mutational Analysis Biology Consanguinity Hexosaminidase A Pregnancy Valine Prenatal Diagnosis Ethnicity Genetics medicine Humans Point Mutation Hexosaminidase Allele Alleles Genetics (clinical) Polymorphism Genetic Tay-Sachs Disease Base Sequence Genetic Carrier Screening Tay-Sachs disease Intron Heterozygote advantage DNA Pennsylvania HEXA medicine.disease beta-N-Acetylhexosaminidases Pedigree Pseudodeficiency alleles Female |
| Zdroj: | Human Mutation. 1:298-302 |
| ISSN: | 1098-1004 1059-7794 |
| DOI: | 10.1002/humu.1380010406 |
| Popis: | Following the birth of two infants with Tay-Sachs disease (TSD), a non-Jewish, Pennsylvania Dutch kindred was screened for TSD carriers using the biochemical assay. A high frequency of individuals who appeared to be TSD heterozygotes was detected (Kelly et al., 1975). Clinical and biochemical evidence suggested that the increased carrier frequency was due to at least two altered alleles for the hexosaminidase A α-subunit. We now report two mutant alleles in this Pennsylvania Dutch kindred, and one polymorphism. One allele, reported originally in a French TSD patient (Akli et al., 1991), is a GTAT transition at the donor splice-site of intron 9. The second, a CT transition at nucleotide 739 (Arg247Trp), has been shown by Triggs-Raine et al. (1992) to be a clinically benign “pseudodeficient” allele associated with reduced enzyme activity against artificial substrate. Finally, a polymorphism [GA(759)], which leaves valine at codon 253 unchanged, is described. © 1992 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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