كروموسوم 7 (بشري) - Chromosome 7 (human)

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Chromosome 7.svg

الكروموسوم 7، هو واحد من 23 زوج من الكروموسومات البشرية. عادة ما يمتلك البشر زوجان من هذا الكروموسوم. يحتوي الكروموسوم 7 على 158 مليون زوج قاعدي (مادة بناء الدنا) ويمثل حوالي 5.5% من إجمالي الدنا في الخلايا.

نظراً لاختلاف المناهج التي يستخدمها الباحثون في التنبؤ بعدد الجينات في كل كروموسوم، هناك تباين في أعداد الجينات المقدرة. من الأرجح أن الكروموسوم 7 يحتوي على 1.000-1.400 جين. ويحتوي أيضاً على مجموعة العلبة المثلية الجينية.

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الأمراض والاضطرابات[تحرير | عدل المصدر]

القائمة التالية لبعض الأمراض المرتبطة بالجينات الموجودة على الكروموسوم 7:


الاضطرابات الكروموسومية[تحرير | عدل المصدر]

The following conditions are caused by changes in the structure or number of copies of chromosome 7:

  • Williams syndrome is caused by the deletion of genetic material from a portion of the long (q) arm of chromosome 7. The deleted region, which is located at position 11.23 (written as 7q11.23), is designated as the Williams syndrome critical region. This region includes more than 20 genes, and researchers believe that the characteristic features of Williams syndrome are probably related to the loss of multiple genes in this region.

While a few of the specific genes related to Williams syndrome have been identified, the relationship between most of the genes in the deleted region and the signs and symptoms of Williams syndrome is unknown.

  • Other changes in the number or structure of chromosome 7 can cause delayed growth and development, mental disorder, characteristic facial features, skeletal abnormalities, delayed speech, and other medical problems. These changes include an extra copy of part of chromosome 7 in each cell (partial trisomy 7) or a missing segment of the chromosome in each cell (partial monosomy 7). In some cases, several DNA building blocks (nucleotides) are deleted or duplicated in part of chromosome 7. A circular structure called ring chromosome 7 is also possible. A ring chromosome occurs when both ends of a broken chromosome are reunited.

المصادر[تحرير | عدل المصدر]

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  • Lichtenbelt KD, Hochstenbach R, van Dam WM, Eleveld MJ, Poot M, Beemer FA (2005). "Supernumerary ring chromosome 7 mosaicism: case report, investigation of the gene content, and delineation of the phenotype". Am J Med Genet A. 132 (1): 93–100. doi:10.1002/ajmg.a.30408. PMID 15580634.CS1 maint: multiple names: authors list (link)
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  • Velagaleti GV, Jalal SM, Kukolich MK, Lockhart LH, Tonk VS (2002). "De novo supernumerary ring chromosome 7: first report of a non-mosaic patient and review of the literature". Clin Genet. 61 (3): 202–6. doi:10.1034/j.1399-0004.2002.610306.x. PMID 12000362.CS1 maint: multiple names: authors list (link)