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  • 1
    ISSN: 1365-2222
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. In order to test for human histocompatibility leucocyte antigens (HLA) class II restriction of IgE responses, 431 subjects from 83 families were genotyped at the HLA-DR and HLA-DP loci and serotyped for IgE responses to six major allergens from common aero-allergen sources. A possible excess of HLA-DR 1 was found in subjects who were responsive to FeldI compared with those who were not (Odds Ratio (OR) = 2, P = 0.002), and a possible excess of HLA-DR4 was found in subjects responsive to Alt a I (OR = 1–9, P = 0.006). Increased sharing of HLA-DR/DP haplotypes was seen in sibling pairs responding to both allergens. Der p I, Der p II, Phi p V and Can f I were not associated with any definite excess of HLA-DR alleles. No significant correlations were seen with HLA-DP genotype and reactivity to any of the allergens. The results suggest class II HLA restriction is insufficient to account for individual differences in reactivity to common allergens.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0340-1855
    Keywords: Key words¶Corticotropin releasing hormone –¶polymorphisms –¶rheumatoid arthritis – genetics ; Schlüsselwörter¶Corticotropin Releasing Hormon –¶Polymorphismen –¶Rheumatoide Arthritis – Genetik
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die 5′ regulatorische Region des Corticotropin Releasing Hormons (CRH) ist hoch konserviert und spielt eine zentrale Rolle in der Vermittlung der Streßantwort des Organismus. Durch im Hypothalamus freigesetztes CRH wird die Hypophysen – Nebennierenrinden – Achse aktiviert, was in der Freisetzung von Cortisol und einer konsekutiven Regulation inflammatorischer und immunologischer Vorgänge resultiert. Ausgehend von der Hypothese, daß die inadäquate CRH Antwort auf Streß bei Patienten mit rheumatoider Arthritis (RA) auf einer genetischen Basis beruht, haben wir die Verteilung der CRH Allele sowohl bei kaukasischen (United Kingdom) als auch bei schwarzen (Südafrika) RA Patienten untersucht und mit der jeweiligen gesunden Kontrollgruppe verglichen. Wie in den kürzlich publizierten Kontrollgruppen fanden wir zwei biallele polymorphe Sequenzen (genannt A1 und A2, bzw. B1 und B2) in der regulatorischen Region des CRH Gens, die zu gemeinsamen Allelen zusammengefaßt werden konnten. Bei den weißen Kaukasiern war das Allel A2B1 protektiv gegenüber der Entwicklung einer RA (p=0,03; odds ratio 0,43, 95% confidence interval 0,21–0,88). Im Gegensatz dazu war bei den schwarzen südafrikanischen RA Patienten das Allel A1B1 positiv mit der RA assoziiert (p=0,05; odds ratio 1,78, 95% confidence interval 1,01–3,15). Die Studie liefert Hinweise darauf, daß Polymorphismen in der regulatorischen Region des CRH Gens neue genetische Marker für eine RA darstellen und eventuell als prädiktiver Faktor eingeführt werden können, wenn weitere genetische und umweltbedingte Risikofaktoren identifiziert werden.
    Notes: Summary The regulatory region of the corticotropin releasing hormone (CRH) is highly conserved and plays a crucial role in the response of the organism to stress. Release of CRH initiates a cascade of events leading to the release of cortisone and the regulation of inflammatory and immune events.¶Objective: Since it has been postulated that the impaired corticotropin releasing hormone (CRH) response to stress in patients with rheumatoid arthritis (RA) has a genetic basis, we investigated the distribution of CRH alleles in a cohort of UK patients as well as in South African RA patients.¶Methods: Restriction fragment length polymorphism of PCR amplified DNA products of the CRH promoter. We compared the allele frequencies in the RA patients with the respective healthy control population described previously.¶Results: As in the control populations we found two biallelic polymorphic sequences (named A1 and A2 and B1 and B2, respectively) in the CRH promoter which could be assigned to compound alleles. The A2B1 compound allele was protective against development of RA in a large group of UK Caucasoid patients (p=0.03; odds ratio 0.43, 95% confidence interval 0.21–0.88). In contrast, A1B1 was positively associated with RA in a cohort of black South African RA patients (p=0.05; odds ratio 1.78, 95% confidence interval 1.01–3.15).¶Conclusion: Taken together, these findings support the hypothesis that CRH promoter polymorphism represents a new genetic marker for RA susceptibility and may prove useful for the prediction of RA risk in the future when further genetic and environmental risk factors are determined.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A 300 base pair deletion near the 3′-end of the gene encoding Type II (cartilage) collagen has been implicated in the pathogenesis of perinatal lethal osteogenesis imperfecta. We have found similar deletions occurring at a high frequency in normal Asian Indian and West Indian populations generated by a length polymorphism just beyond the 3′-end of the gene. We suggest that this polymorphism provides an alternative explanation of the original results.
    Type of Medium: Electronic Resource
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