• We are sorry, but NCBI web applications do not support your browser and may not function properly. More information
Logo of bmjLink to Publisher's site
BMJ. Nov 20, 1999; 319(7221): 1337–1338.
PMCID: PMC28280

High penetrance, overweight, and glucocorticoid receptor variant: case-control study

Ruby C Y Lin, PhD student, William Y S Wang, master of medicine student, and Brian J Morris, professor of physiology

A possible link between the glucocorticoid receptor gene (GRL, 5q31-q32) and overweight has been suggested in a study of 42 families with morbid obesity.1 Data from another small study—of pairs of siblings—although not significant, showed a trend towards similar body mass index (weight(kg)/(height(m)2); difference=2.4) for 20 pairs sharing similar alleles compared with 19 pairs having discordant alleles (difference=3.5).2 An Asn363Ser variant, caused by a single nucleotide difference (A1218G) in exon 2 of GRL has since shown an association with increased sensitivity to glucocorticoids.3 Because of the predisposition to a rise in body mass index that this increased sensitivity should cause, we tested this variant for association with overweight in two groups of non-diabetic white subjects of British descent.

Methods and results

All participants lived in or near Sydney and had responded to requests to take part in a study that involved DNA testing. Because of the interaction between obesity and hypertension we selected subjects on the basis of a positive or negative family history of hypertension and tested them separately. Group 1 was recruited from donors at the Sydney Blood Bank and comprised 195 subjects who were normotensive offspring of two normotensive parents. Group 2 comprised 124 subjects recruited by public advertising for people with essential hypertension whose parents also had hypertension. Mean body mass index was 26 (SD 4) in group 1 and 26 (SD 5) in group 2; mean age was 48 (SD 10) years and 52 (SD 12) years respectively; percentage of male participants was 57% and 49% respectively; and blood pressure was 120 (SD 11)/73 (SD 8) mm Hg and 173 (SD 24)/110 (SD 17) mm Hg respectively.

Each group was divided into two subgroups: lean (body mass index ≤25) and overweight (>25). Genotyping was performed on leucocyte DNA using polymerase chain reaction primers described previously4 and Tsp509I digestion of polymerase chain reaction products, which gave a band of 134 base pairs for the Asn363 variant and 153 base pairs for the Ser363 variant, together with a band of 95 base pairs for both.

The frequency of the Ser363 variant (number of Ser363 alleles divided by total number of alleles) in each group was similar (7.4% (95% confidence interval 4.8% to 10.0%) in group 1 v 6.0% (3.1% to 9.0%) in group 2), with 12.3% (7.7% to 16.9%) in group 1 being carriers (that is, they had one or two alleles) and 10.5% (5.1% to 15.9%) in group 2. In participants with body mass index ≤25 the Ser363 allele was rare (1.8% in group 1 and 0% in group 2). All Ser/Ser homozygotes were overweight, as were all Asn/Ser heterozygotes in group 2 and 80% of Asn/Ser heterozygotes in group 1 (table). Association with overweight was highly significant (table), with overall penetrance in participants with the Ser363 variant being 83% in group 1 and 100% in group 2. Consistent with this, the higher the body mass index, the more likely the subject was to have the Ser363 variant (table).

Comment

We found that the Ser363 variant of the glucocorticoid receptor confers a virtually absolute likelihood of being overweight—unlike most markers of overweight, which confer only a slight increase in likelihood. The allele is relatively common. Given the difference in response to various modalities of intervention according to genetic propensity to increased body mass index for a variant in another gene,5 our finding of almost complete penetrance of Ser363 genotypes to an overweight phenotype suggests that use of this marker could be important in clinical management.

Table
Association of Ser363 allele of GRL gene with overweight and body mass index

Footnotes

Funding: The study was supported by a grant from the National Health and Medical Research Council of Australia.

Competing interests: None declared.

References

1. Clement K, Philippi A, Jury C, Pividal R, Hager J, Demenais F, et al. Candidate gene approach of familial morbid obesity: linkage analysis of the glucocorticoid receptor gene. Int J Obesity. 1996;20:507–512. [PubMed]
2. Takami S, Wong ZYH, Stebbing M, Harrap SB. Linkage analysis of glucocorticoid and β2-adrenergic receptor genes with blood pressure and body mass index. Am J Physiol. 1999;276:H1379–H1384. [PubMed]
3. Huizenga NATM, Koper JW, deLange P, Pols HAP, Stolk RP, Burger H, et al. A polymorphism in the glucocorticoid receptor gene may be associated with increased sensitivity to glucocorticoidsin vivo. J Clin Endocrin Metab. 1998;83:144–151. [PubMed]
4. Koper JW, Stolk RP, de Lange P, Huizengo NATM, Molijn G-J, Pols HAP, et al. Lack of association between five polymorphisms in the human glucocorticoid receptor gene and glucocorticoid resistance. Hum Genet. 1997;99:663–668. [PubMed]
5. Meirhaeghe A, Helbecque N, Cottel D, Amouyel P. β2-adrenoceptor gene polymorphism, body weight, and physical activity. Lancet. 1999;353:895–896. [PubMed]

Articles from BMJ : British Medical Journal are provided here courtesy of BMJ Group
PubReader format: click here to try

Formats:

Related citations in PubMed

See reviews...See all...

Cited by other articles in PMC

See all...

Links

  • PubMed
    PubMed
    PubMed citations for these articles

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...