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Monosomy for the X-Chromosome Is Associated with an Atherogenic Lipid Profile

Developmental Endocrinology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892

Address all correspondence and requests for reprints to: Carolyn Bondy, M.D., Chief, Developmental Endocrinology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892. E-mail: bondyc{at}mail.nih.gov.

Abstract

Context and Objective: Men typically have a more atherogenic lipid profile than women characterized by higher low-density lipoprotein (LDL) cholesterol and triglyceride levels and reduced lipid particle size, contributing to a greater risk for coronary disease. To determine whether X-chromosomal gene dosage affects lipid metabolism independent of sex steroid effects, we compared lipid profiles in age- and body mass-matched young women with ovarian failure, differing only in X-chromosome dosage.

Design, Setting, and Patients: Women with premature ovarian failure associated with monosomy X or Turner syndrome (TS, n = 118) were compared with women with 46,XX premature ovarian failure (n = 51) in an in-patient clinical research center unit at the National Institutes of Health. These women were normally on estrogen replacement treatment but discontinued the estrogen 2 wk before study.

Major Outcomes: Fasting lipid levels and nuclear magnetic resonance lipid particle profiles in the two study groups were the major outcomes.

Results: Average age and body mass were similar in the two groups of women, but LDL cholesterol (P = 0.001) and triglyceride levels (P = 0.0005) were higher in the TS group. Also among women with TS, average LDL particle size was reduced (P < 0.0001) and LDL particle concentration increased, with a 2-fold increase in the smallest particle categories (P < 0.0001). Whereas total high-density lipoprotein cholesterol levels were similar, high-density lipoprotein particle size was significantly smaller in women with TS, compared with women with premature ovarian failure (P < 0.0001).

Conclusions: Women with 45,X with ovarian failure exhibit a distinctly more atherogenic lipid profile than 46,XX women with ovarian failure, suggesting that the second X-chromosome contributes to a more salutary lipid profile in normal women, independent of sex steroid effects.

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				C. A. Bondy and for The Turner Syndrome Consensus Study Group Care of Girls and Women with Turner Syndrome: A Guideline of the Turner Syndrome Study Group J. Clin. Endocrinol. Metab., January 1, 2007; 92(1): 10 - 25. [Abstract] [Full Text] [PDF]