cDNA cloning and expression of a novel estrogen receptor beta-subtype in goldfish (Carassius auratus)
2000
Ma, C.H. | Dong, K.W. | Yu, K.L.
We have isolated a second goldfish estrogen receptor (ER) beta-subtype (gfER-beta 2) cDNA which is distinct from the liver-derived ER-beta (gfER-beta l) cDNA reported previously. The 2650-bp cDNA, isolated from a goldfish pituitary and brain cDNA library, encodes a 610 amino acid (aa) protein which shows only a 53% aa sequence identity with gfER-beta l in overall structure. RT-PCR analysis showed that mRNA of gfER-beta 2, in contrast to that of gfER-beta l, was predominantly expressed in pituitary, telencephalon and hypothalamus as well as in liver of female goldfish. The existence of a second distinct ER-beta subtype opens new dimensions for studying tissue-specific regulation of gene expression by estrogen in the tetraploid goldfish.
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