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This version published online on May 23, 2006
Journal of Clinical Endocrinology & Metabolism, doi:10.1210/jc.2005-2702
A more recent version of this article appeared on August 1, 2006
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Submitted on December 12, 2005
Accepted on May 17, 2006

Haplotype Analysis Reveals Founder Effects of Thyroglobulin Gene Mutations C1058R and C1977S in Japan

Akira Hishinuma*, Shuji Fukata, Soroku Nishiyama, Yoshikazu Nishi, Masamichi Oh-Ishi, Yoshiharu Murata, Yoshihide Ohyama, Nobuo Matsuura, Kikuo Kasai, Shohei Harada, Sachiko Kitanaka, Junta Takamatsu, Kohji Kiwaki, Hidemi Ohye, Takashi Uruno, Chisato Tomoda, Toshihiro Tajima, Kanji Kuma, Akira Miyauchi, and Tamio Ieiri

Departments of Clinical Laboratory Medicine (A.H., T.I.) and Endocrinology and Metabolism (K.Ka.), Dokkyo University School of Medicine, Mibu, Tochigi, 321-0293, Japan; Kuma Hospital (S.F., H.O., T.U., C.T., K.Ku., A.M.), Kobe, Hyogo, 650-0011, Japan; Department of Pediatrics (S.N., K.Ki.), Kumamoto University School of Medicine, Kumamoto, 860-8556, Japan, Department of Pediatrics (Y.N.), Hiroshima Red Cross Hospital, Hiroshima, 730-8691, Japan; Department of Physics, School of Science (M.O.) and Department of Pediatrics, School of Medicine (N.M.), Kitasato University, Kanagawa, 228-8555, Japan; Research Institute of Environmental Medicine (Y.M.), Nagoya University, Nagoya, 464-8601, Japan; Ohyama Clinic (Y.O.), Sagamihara, Kanagawa, 228-8555, Japan; Department of Health Policy, National Center for Child Health and Development (S.H.), Setagaya, Tokyo, 157-8535, Japan; Department of Pediatrics, Graduate School of Medicine, University of Tokyo (S.K.), Bunkyo-ku, Tokyo, 113-8655, Japan; Takamatsu Endocrine Clinic (J.T.), Takatsuki, Osaka, 569-0804, Japan; and Department of Pediatrics (T.T.), Hokkaido University School of Medicine, Sapporo, 060-8638. Japan

* To whom correspondence should be addressed. E-mail: a-hishi{at}dokkyomed.ac.jp.

Context: Thyroglobulin (Tg) mutations were previously believed to be rare, resulting in congenital goitrous hypothyroidism. However, an increasing number of patients with Tg mutations, who are euthyroid to mildly hypothyroid, have been identified in Japan.

Objectives: The purpose of this study is to investigate whether the three frequently found Tg mutations, namely C1058R, C1245R, and C1977S, were caused by a founder effect.

Results: We found 26 different mutations within the Tg gene in 52 patients from 41 families. Thirty-five patients were homozygous for the mutations, while the others were compound heterozygous. The occurrence of Tg mutation within the general Japanese population is 1/67,000. Patients with the C1245R mutation were found throughout Japan, while those with the C1058R mutation were confined to a small village on a southern island and those with the C1977S mutation were restricted to a city. The eight patients with the C1058R mutation and the seven patients with the C1977S mutation all showed the same combinations of 18 single nucleotide polymorphisms in the coding region of the Tg gene, which would appear 1/810,000,000 and 1/37,000,000,000, respectively, in control subjects.

Conclusions: The frequently found mutations, C1058R and C1977S, were caused by founder effects. This result suggests that Tg mutations may provide a genetic basis for the cause of familial euthyroid goiter.
Key words: Thyroglobulin • Congenital hypothyroidism • Endoplasmic reticulum storage disease • Haplotype analysis • founder effect




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