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Stature in Ecuadorians Heterozygous for Growth Hormone Receptor Gene E180 Splice Mutation Does Not Differ From That of Homozygous Normal Relatives¹

Department of Pediatrics, University of Florida College of Medicine, Children’s Medical Services Center (A.R.), 1701 SW 16th Avenue, Gainesville, Florida 32608; Institute of Endocrinology Metabolism and Reproduction (J.G-A.), Quito, Ecuador; and Department of Genetics and Howard Hughes Medical Institute, Stanford University Medical Center (M.S.B., U.F.), Stanford, California 94305-5323

Address all correspondence and requests for reprints to: Arlan L. Rosenbloom, Department of Pediatrics, University of Florida College of Medicine, Children’s Medical Services Center (A.R.), 1701 SW 16th Avenue, Gainesville, Florida 32608. E-mail: rosenal{at}peds.ufl.edu

Heterozygosity for certain mutations of the GH receptor (GHR) gene has been proposed as the cause of partial resistance to GH, and there has been a recent demonstration of a dominant-negative effect of such a mutation in a mother and child. To examine the effect of heterozygosity in a large genetically homogeneous population with GHR deficiency, in which a substantial number of heterozygous (carrier) subjects and homozygous normal individuals can be compared, we studied a population in Ecuador in which 70 individuals with GHR deficiency were homozygous for the E180 splice mutation. We found that 58 heterozygous relatives of probands were not significantly shorter than 37 homozygous normal relatives [SD score (SDS) for height -1.85 ± 1.04 (SD) vs. -1.55 ± 0.96, P > 0.10]. When only those families with both homozygous normals and carriers were compared, the 33 heterozygous and 29 normal relatives did not differ significantly in height SDS (-1.98 ± 1.07 vs. -1.77 ± 0.91, P > 0.3).

If heterozygosity for the E180 splice mutation were to influence stature, heights of heterozygous parents of probands would be expected to correlate with those of probands and of carriers who are their offspring and not with heights of their homozygous normal children. Parental height SDS did not correlate with height SDS of affected offspring (r = 0.24). For unaffected siblings as a group or analyzed separately as normals or carriers, there was a strong correlation between parental and offspring SDS for height (P < 0.01 for all comparisons). Thus, the effect of homozygosity for the GHR mutation was so profound as to abolish parental influence on height, and there was no difference in the influence of parental stature between carrier and noncarrier offspring. These findings demonstrate no meaningful effect on stature of heterozygosity for the E180 splice mutation of the GHR, which is a functional null mutation and, in the homozygous state, results in profound short stature from severe insulin-like growth factor-I deficiency.

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