کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3354265 1216923 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A Recombination Silencer that Specifies Heterochromatin Positioning and Ikaros Association in the Immunoglobulin κ Locus
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری ایمنی شناسی و میکروب شناسی ایمونولوژی
پیش نمایش صفحه اول مقاله
A Recombination Silencer that Specifies Heterochromatin Positioning and Ikaros Association in the Immunoglobulin κ Locus
چکیده انگلیسی

SummaryAllelic exclusion ensures that individual B lymphocytes produce only one kind of antibody molecule. Previous studies have shown that allelic exclusion of the mouse Igκ locus occurs by the combination of monoallelic silencing and a low level of monoallelic activation for rearrangement combined with a negative feedback loop blocking additional functional rearrangements. Using yeast artificial chromosome-based single-copy isotransgenic mice, we have identified a cis-acting element that negatively regulates rearrangement in this locus, specifically in B cells. The element, termed Sis, resides in the V-J intervening sequence. Sis specifies the targeting of Igκ transgenes in pre-B and B cells to centromeric heterochromatin and associates with Ikaros, a repressor protein that also colocalizes with centromeric heterochromatin. Significantly, these are hallmarks of silenced endogenous germline Igκ genes in B cells. These results lead us to propose that Sis participates in the monoallelic silencing aspect of allelic exclusion regulation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 24, Issue 4, April 2006, Pages 405–415
نویسندگان
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