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Fabry disease: isolation of a cDNA clone encoding human alpha-galactosidase A
Summary
Researchers isolated a clone encoding human alpha-galactosidase A (alpha-Gal A) to study Fabry disease, an inborn error of metabolism. This clone provides a tool for investigating enzyme structure, organization, expression, and disease-causing mutations.
Area of Science:
- Biochemistry
- Genetics
- Molecular Biology
Background:
- Fabry disease is an X-linked metabolic disorder caused by deficient alpha-galactosidase A (alpha-Gal A) activity.
- Understanding alpha-Gal A's structure and expression is crucial for investigating Fabry disease mutations.
Purpose of the Study:
- To isolate and characterize a clone encoding human alpha-Gal A.
- To facilitate the study of alpha-Gal A structure, organization, expression, and Fabry disease mutations.
Main Methods:
- Isolation of a human alpha-Gal A clone from a lambda gt11 expression library.
- Purification of homogeneous enzyme for antibody production and microsequencing.
- Synthesis of oligonucleotide probes based on amino-terminal and internal peptide sequences.
- Screening of cDNA library using antibody and oligonucleotide probes.
- Nucleotide sequencing of the isolated clone (lambda AG18).
Main Results:
- A single clone, lambda AG18, was identified that specifically bound antibodies and hybridized to oligonucleotide probes.
- Nucleotide sequencing confirmed the clone contains the coding region for processed, active alpha-Gal A.
- The clone also includes sequences for the amino-terminal propeptide, indicating its role in enzyme maturation.
Conclusions:
- The isolated lambda AG18 clone represents a full-length coding region for human alpha-Gal A.
- This clone is a valuable tool for further research into alpha-Gal A, Fabry disease, and potential therapeutic strategies.