Human estrogen receptor beta 548 is not a common variant in three distinct populations.
Several isoforms of estrogen receptor (ER) beta (also known as NR3A2) have been reported, including variants with different N-terminal ends. In rodents, two in-frame initiation codons (ATGs) are used to produce proteins of 530 and 549 amino acids, respectively. In humans, the upstream ATG is out of frame in all clones reported, until recently, when human clones with an extra A-T base pair placing the upstream ATG in frame were reported. The authors suggested that this could represent a novel polymorphism in the ERbeta gene. Because human ERbeta548 (hERbeta548) and hERbeta530 display different functional characteristics in vitro, it is of interest to determine if this variant constitutes a polymorphism in human populations. We therefore determined the frequency of this novel isoform in several populations including African (n = 96), Caucasian (n = 100), and Asian (n = 128) subjects using denaturing HPLC. We did not detect any alleles that correspond to hERbeta548 in these samples or in additional samples of heterogeneous origin. It is concluded that hERbeta548 is not a common variant in Africans, Caucasians, or Asians.
Xu
Li
L
Karolinska Institute, Department of Biosciences at Novum, SE-14157 Huddinge, Sweden.
Pan-Hammarström
Qiang
Q
Försti
Asta
A
Hemminki
Kari
K
Hammarström
Lennart
L
Labuda
Damian
D
Gustafsson
Jan-Ake
JA
Dahlman-Wright
Karin
K
D000483:Alleles; D000595:Amino Acid Sequence; D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D044383:Black People / Q000235:genetics; D002681:China / Q000208:ethnology; D002851:Chromatography, High Pressure Liquid; D047629:Estrogen Receptor beta; D005387:Finland / Q000208:ethnology; D005714:Gambia / Q000208:ethnology; D005787:Gene Frequency; D014644:Genetic Variation; D006801:Humans; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D020033:Protein Isoforms / Q000235:genetics*; D011960:Receptors, Estrogen / Q000737:chemistry / Q000235:genetics*; D044465:White People / Q000235:genetics
D047629:Estrogen Receptor beta; D020033:Protein Isoforms; D011960:Receptors, Estrogen