Brian R Tulloch

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The gene RPGR was previously identified in the RP3 region of Xp21.1 and shown to be mutated in 10-20% of patients with the progressive retinal degeneration X-linked retinitis pigmentosa (XLRP). The mutations predominantly affected a domain homologous to RCC1, a guanine nucleotide exchange factor for the small GTPase Ran, although they were present in fewer(More)
The canine disease, X-linked progressive retinal atrophy (XLPRA), is similar to human RP3, an X-linked form of retinitis pigmentosa, and maps to the same region in the X chromosome. Analysis of the physical map of the XLPRA and RP3 intervals shows a high degree of conservation in terms of genes and their order. We have found different mutations in exon(More)
The ORF15 isoform of RPGR (RPGR(ORF15)) and RPGR interacting protein 1 (RPGRIP1) are mutated in a variety of retinal dystrophies but their functions are poorly understood. Here, we show that in cultured mammalian cells both RPGR(ORF15) and RPGRIP1 localize to centrioles. These localizations are resistant to the microtubule destabilizing drug nocodazole and(More)
BACKGROUND Diabetic dyslipidemia is characterized by high triglyceride levels; low high-density lipoprotein cholesterol levels; small, dense low-density lipoprotein particles; and high free fatty acid levels. Niacin reduces concentrations of triglyceride-rich and small low-density lipoprotein particles while increasing high-density lipoprotein cholesterol(More)
PURPOSE The retinitis pigmentosa guanosine triphosphatase (GTPase) regulator (RPGR) is essential for photoreceptor survival. There is as yet no consensus concerning the subcellular localization of RPGR. This study was undertaken as a comprehensive effort to resolve current controversies. METHODS RPGR in mice and other mammalian species was examined by(More)
Late-onset retinal macular degeneration (L-ORMD) is an autosomal dominant condition resembling age-related macular degeneration (AMD) in which a key pathological feature is a thick extracellular sub-retinal pigment epithelial (RPE) deposit. L-ORMD is caused by mutation in the C1QTNF5 (CTRP5) short-chain collagen gene, but the disease mechanism is unknown.(More)
Studies of calcium metabolism in 38 patients with cancer indicated that: 1) intestinal absorption of calcium was reduced in patients with skeletal metastases and in those with hypercalcemia; 2) calcium-47 space (a measurement of bone turnover rate) was high in the patients with skeletal metastases; 3) hypercalcemic patients had higher urinary and endogenous(More)
An increasing body of evidence suggests that diabetes mellitus constitutes a major health burden among the Mexican-American population. For example, county-wide death rates in Texas attributable to diabetes from 1970-1981 range from 2.5-52.0 diabetes deaths per 1000 total deaths with the highest rates generally occurring in counties whose populations are(More)
The prevalence of gallbladder disease (surgery or complaints) among Mexican Americans in Starr County, Texas, is demonstrated to be some threefold higher than in Framingham, with 13% and 26% of males and females, respectively, over the age of 35 years having the disease. The population aggregation of gallbladder disease in Amerindian groups and those(More)