Isolation of a complementary DNA clone for thyroid microsomal antigen. Homology with the gene for thyroid peroxidase.

Isolation of a complementary DNA clone for thyroid microsomal antigen. Homology with the gene for thyroid peroxidase.
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分离甲状腺微粒体抗原的互补 DNA 克隆。

DOI:
10.1172/jci113181
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发表时间:
1987
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Rapoport,B
Rapoport,B
中科院分区:
--
文献类型:
--
作者:
Seto,P;Hirayu,H;Magnusson,RP;Gestautas,J;Portmann,L;DeGroot,LJ;Rapoport,B

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自身免疫性甲状腺疾病中的甲状腺微粒体抗原(MSA)是一种约107 kD的蛋白质。我们用抗107-kD单克隆抗体筛选了构建在表达载体λ gt 11上的人甲状腺cDNA文库。在获得的5个克隆中,证实来自一个克隆(PM-5)的重组β-半乳糖苷酶融合蛋白与单克隆抗血清反应。将来自PM-5的互补DNA(cDNA)插入物(0.8kb)用作北方印迹分析的探针,以估计编码MSA的mRNA的大小。观察到的2.9 kb信使RNA(mRNA)种类与编码人甲状腺过氧化物酶(TPO)的大小相同。该探针不与人肝脏mRNA结合,表明PM-5相关mRNA的甲状腺特异性。测定了PM-5的核苷酸序列(842 bp),其由单个开放阅读框组成。比较PM-5的核苷酸序列与目前可获得的猪TPO的核苷酸序列表明84%的同源性。总之,已分离出代表微粒体抗原部分的cDNA克隆。与猪TPO的序列同源性,以及微粒体抗原和TPO的mRNA种类大小的同一性,表明微粒体抗原至少部分是TPO。图片
The thyroid microsomal antigen (MSA) in autoimmune thyroid disease is a protein of approximately 107 kD. We screened a human thyroid cDNA library constructed in the expression vector lambda gt11 with anti-107-kD monoclonal antibodies. Of five clones obtained, the recombinant beta-galactosidase fusion protein from one clone (PM-5) was confirmed to react with the monoclonal antiserum. The complementary DNA (cDNA) insert from PM-5 (0.8 kb) was used as a probe on Northern blot analysis to estimate the size of the mRNA coding for the MSA. The 2.9-kb messenger RNA (mRNA) species observed was the same size as that coding for human thyroid peroxidase (TPO). The probe did not bind to human liver mRNA, indicating the thyroid-specific nature of the PM-5-related mRNA. The nucleotide sequence of PM-5 (842 bp) was determined and consisted of a single open reading frame. Comparison of the nucleotide sequence of PM-5 with that presently available for pig TPO indicates 84% homology. In conclusion, a cDNA clone representing part of the microsomal antigen has been isolated. Sequence homology with porcine TPO, as well as identity in the size of the mRNA species for both the microsomal antigen and TPO, indicate that the microsomal antigen is, at least in part, TPO.Images
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