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. 1986 Aug;83(15):5568–5572. doi: 10.1073/pnas.83.15.5568

Isolation of a rat liver delta-aminolevulinate dehydrase (ALAD) cDNA clone: evidence for unequal ALAD gene dosage among inbred mouse strains.

T R Bishop, P J Cohen, S H Boyer, A N Noyes, L P Frelin
PMCID: PMC386329  PMID: 3502704

Abstract

We have isolated several cDNA clones encoding delta-aminolevulinate dehydrase [ALAD; porphobilinogen synthase; 5-aminolevulinate hydro-lyase (adding 5-aminolevulinate and cyclizing), EC 4.2.1.24], the second enzyme in the heme biosynthetic pathway. We used a rabbit polyclonal antibody developed against the purified 35-kDa subunit of rat liver ALAD to screen a lambda gt11 cDNA expression library constructed from rat liver mRNA. A prototype clone (ALAD-1) contained a 680-base-pair insert and expressed a 140-kDa beta-galactosidase gene cDNA insert fusion protein immunoreactive with both polyclonal and monoclonal anti-ALAD. Identity of ALAD-1 was verified by hydridization to ALAD mRNA that had been enriched via immunopurification of rat liver polysomes with anti-ALAD. Intensity of such hybridization to a 1500-nucleotide-long mRNA was approximately equal to 200-fold greater than that realized with whole liver mRNA, a result consistent with the degree of immunoenrichment of ALAD mRNA found independently by analysis of cell-free translation products. A second ALAD cDNA clone (ALAD-3) was isolated when the rat liver cDNA expression library was rescreened with ALAD-1. The identity of both ALAD cDNA clones was established by correspondence between their nucleotide sequence and the reported amino-terminal protein sequence of bovine ALAD. Hybridization of ALAD cDNA to mouse genomic DNA indicates that the previously unexplained incremental differences in ALAD enzymatic activity among inbred mouse strains has arisen through alterations in ALAD gene dose.

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