In order to investigate whether the impaired GH secretion associated with obesity is due to a pituitary disorder we studied GH mRNA levels by in situ hybridization in genetically obese and lean Zucker rats. The levels of GH mRNA were at least two…
The structure-function relationships of the 43-amino-acid membrane-binding domain of cytochrome b(5) have been examined in two mutant forms of the protein. In one mutant, two tryptophans in the membrane-binding domain, at positions 108 and 112, were…
We have isolated and sequenced a cDNA clone corresponding to human liver cytochrome b5 mRNA. The 760 base pair (bp) sequence contains the complete coding and 3' non-translated regions plus 52 bp of 5' non-translated sequence. The derived amino acid…
We have isolated cDNA clones corresponding to partially processed human liver cytochrome b5 mRNAs. All the clones contained poly(A) sequences, and one clone had a shorter 3' non-translated sequence, indicating the use of an alternative poly(A)…
RNA extracted from rabbit leukocytes and reticulocytes was reverse transcribed and used in the Polymerase Chain Reaction technique along with primers designed to amplify the coding sequence of rabbit cytochrome b5. The resultant amplified products…
Using a synthetic 26 base pair (bp) oligonucleotide, we have screened a rabbit liver cDNA library in lambda gt11 and isolated a 1000 bp DNA clone corresponding to cytochrome b5 mRNA. The clone contains the complete coding region and long 5' and 3'…
In order to investigate whether the impaired GH secretion associated with obesity is due to a pituitary disorder we studied GH mRNA levels by in situ hybridization in genetically obese and lean Zucker rats. The levels of GH mRNA were at least two…
The secretion of growth hormone (GH) is abnormal in genetically obese Zucker rats. Measurements of pulsatile GH release and circulating GH levels in lean (Fa/?) and obese (fa/fa) rats have shown that both are reduced in the latter. We have studied…
Total RNA was extracted from a variety of rabbit tissues and reverse transcribed for use in the polymerase chain reaction technique. Using primers designed to amplify the membrane-bound liver cytochrome b5 cDNA, products of two sizes were observed.…
Using a combination of standard cDNA library screening techniques and the Polymerase Chain Reaction (PCR) we have isolated and sequenced DNA fragments corresponding to the human reticulocyte cytochrome b5 mRNA. The reticulocyte specific sequence…
Using very high stringency hybridization conditions for the Southern blot hybridization analysis of hamster-human cell hybrid DNA, we were able to map the human cytochrome b5 gene and two of its pseudogenes (psgb(5)1 and psgb(5)2) unambiguously to…
We have analyzed reticulocyte and leukocyte mRNAs isolated from a patient with congenital methemoglobinemia and pseudohermaphrodism. The cytochrome b5 cDNA sequences were amplified using specific oligonucleotide primers and the polymerase chain…
This is the first isolation and characterization of a cytochrome b5(b5) gene. The bovine b5 gene is quite large, spanning about 28 kb and contains six exons. One of these exons appears to code for a reticulocyte-specific sequence similar to that…
