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© 1994 Oxford University Press

OTHER

Monoallelic expression of normal mRNA in the PIT1 mutation heterozygotes with normal phenotype and biallelic expression in the abnormal phenotype

Nobuhiko Okamoto*, Yoshinao Wada, Shinobu Ida, Ryoichi Koga, Kelichi Ozono, Hide-aki Chiyo, Akira Hayashi and Ke-ita Tatsumi1

Osaka Medical Center and Research Institute for Maternal and Child Health 840, Murodo-cho, Izumi, Osaka 590-02 1Department of Laboratory Medicine, Osaka University Medical School 2.2, Yamadaoka, Suita, Osaka 565, Japan

* To whom correspondence should be addressed

Received March 28, 1994; Revised July 6, 1994; Accepted July 6, 1994

The combined deficiency of thyrotropin, growth hormone and prolactin, caused by PIT1 abnormality manifests in the homozygous or heterozygous state. We studied a patient having an allele with Arg271 Trp mutation, which produces clinical symptoms in heterozygotes by a dominant-negative effect. However, in the family, her father, grandmother and aunts had the same mutation without clinical symptoms, although the proband had typical phenotypic expression. We analyzed the PIT1 transcript in peripheral lymphocytes by reverse transcription-polymerase chain reaction and found monoallelic expression of normal allele in the father and grand-mother and skewed pattern of biallelic expression in the proband. The phenotypic expression of PIT1 abnormality may depend on different transcription of the PIT1 gene.


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