Zlotogora J, Chakraborty S, Knowlton R G, Wenger D A
Department of Biochemistry and Molecular Biology, Jefferson Medical College, Philadelphia, PA 19107.
Am J Hum Genet. 1990 Jul;47(1):37-44.
Using genetic linkage we have localized the gene coding for galactocerebrosidase (GALC) to human chromosome 14. Patients with Krabbe disease and their family members were assayed for GALC activity in leukocytes or fibroblasts and were classified as affected, carrier, noncarrier, or unknown. Polymorphic DNA markers from chromosome 14 demonstrated a multipoint LOD score of 3.40 with GALC located 13 cM centromere distal to CRI-C70 (D14S24). This finding is consistent with the location of the mouse twitcher mutation (a model of human GALC deficiency) on chromosome 12, which has substantial homology to human chromosome 14. Our data do not support a previous report's localization of GALC to chromosome 17.
我们利用基因连锁分析将编码半乳糖脑苷脂酶(GALC)的基因定位到人类第14号染色体上。对克拉伯病患者及其家庭成员的白细胞或成纤维细胞进行了GALC活性检测,并将其分类为患病、携带者、非携带者或未知类型。来自第14号染色体的多态性DNA标记显示,与位于CRI-C70(D14S24)着丝粒远端13 cM处的GALC的多点对数优势评分(LOD score)为3.40。这一发现与小鼠震颤突变(人类GALC缺乏症模型)位于第12号染色体上的位置一致,该染色体与人类第14号染色体具有高度同源性。我们的数据不支持之前一份报告中将GALC定位到第17号染色体的结论。