Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.1.30.2 (endonuclease)
 18,621 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Alloimmunization against the human platelet alloantigen system Br (HPA-5) is the second most common cause of neonatal alloimmune thrombocytopenia (NAIT) in Caucasian populations. We have recently shown that a single base polymorphism at position 1648 on platelet mRNA coding for GPIa results in an aminoacid substitution at position 505 on the mature GPIa which is associated with the two serological defined Br phenotypes. Since DNA-typing of platelet alloantigens offers possibilities for useful clinical applications, we designed genomic DNA-based restriction fragment length polymorphism (RFLP) typing for Br alloantigens. To establish this technique we analyzed the genomic organization of GPIa adjacent to the polymorphic base. Using the polymerase chain reaction (PCR) of blood cell DNA we have identified two introns (approximately 1.7 and 1.9 kb) flanking a 144 bp coding sequence of the GPIa gene encompassing the polymorphic base 1648. Based on the intron sequence, a PCR primer was constructed to amplify a 274 bp fragment which was used for allele-specific RFLP to determine the Br genotypes. The results of RFLP analysis using MnlI endonuclease obtained from 15 donors (2 Bra/a, 2 Bra/b and 11 Brb/b) correlate perfectly with serological typing by monoclonal antibody-specific immobilization of platelet antigens (MAIPA) assay.
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PMID:Localization of the Br polymorphism on a 144 bp exon of the GPIa gene and its application in platelet DNA typing. 791 94

Alloimmunization against the platelet alloantigen Br (HPA-5) is the second most common cause of neonatal alloimmune thrombocytopenia (NAIT) in Caucasian populations. We have recently shown that a single-base polymorphism at position 1648 on platelet mRNA coding for GPIa results in an amino acid substitution at position 505 on the mature glycoprotein Ia which is associated with the two serologically defined Br phenotypes. To establish DNA-based genotyping for the Br system we elucidated the genomic organization of the GPIa gene adjacent to the polymorphic base. Using PCR of blood cell DNA we have identified a 144 bp exon encoding the Br polymorphic base. A PCR primer based on the 3' intron sequence of this exon in combination with an exon-primer was used to amplify a 274 bp fragment of the GPIa gene. Restriction analysis using the endonuclease Mnl I leads to a Br-specific restriction fragment length polymorphism (RFLP) which perfectly correlates with serological phenotyping.
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PMID:[Molecular biologic clarification of Br alloantigens in human platelets and its application in DNA typing]. 948 92