Summary. In the past few years it has been possible by combining enzymatic cleavage of genomic DNA and the Southern blot hybridization technique to explore the endonuclease recognition site polymorphism of the MHC. HLA class I and DR and DQ alpha and beta class II specific probes as well as human C4 and Bf class III probes were used. All these probes were shown to cross‐hybridize with DNA from pigs, cattle, sheep and horses. Hybridization of human genomic DNA with a class I probe showed 15–25 bands per genome depending on the enzyme used. Distinct endonucleases generated clusters of restriction fragments (RF) in HLA‐informative families which correlated with HLA specificites. While numerous clusters were found associated with HLA‐A alleles almost no cluster was related to HLA B or C specificities. Similarly, class II probes provided a large number of clusters. The existence of these clusters suggested that some polymorphic restriction sites are found in strong linkage disequilibrium and that the underlying mechanism might be gene conversion with heteroduplex correction. Since the degree of polymorphism detected by RF appears to be greater than the polymorphism defined by more traditional methods stronger associations between RF and pathological conditions are to be expected.
Animal Genetics – Wiley
Published: Aug 1, 1986
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