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Two distinct mutant alleles of the precursor (p) short chain acyl-CoA dehydrogenase (SCAD) gene were identified in a SCAD-deficient patient (YH2065) using the polymerase chain reaction to amplify cDNA synthesized from total RNA from her fibroblasts. Cells from this patient had previously been shown to synthesize a labile variant SCAD in contrast to the normal stability of variant SCADs in two other SCAD-deficient cell lines (Naito, E., Y. Indo, and K. Tanaka. 1989. J. Clin. Invest. 84:1671-1674). In the present study, both mutant alleles of YH2065 were found to contain a C----T transition, one at position 136 and the other at position 319 of the coding region of pSCAD cDNA. Clones of cDNA amplified from this region showed only one of the C----T transitions, indicating that each mutation was derived from different pSCAD alleles. Each of these mutations altered a known restriction endonuclease site, and restriction analysis of additional cDNA clones from amplified mutant cDNA and Southern blotting of mutant genomic DNA confirmed the presence of two unique mutant alleles in YH2065, indicating YH2065 is a compound heterozygote. These C----T transitions result in the substitution of Arg-22 and Arg-83 of the mature SCAD with Trp and Cys, respectively.

journal of clinical investigation

Identification of two variant short chain acyl-coenzyme A dehydrogenase alleles, each containing a different point mutation in a patient with short chain acyl-coenzyme A dehydrogenase deficiency.