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Early childhood BMI trajectories in monogenic obesity due to leptin, leptin receptor, and melanocortin 4 receptor deficiency

Subjects

Abstract

Objective:

To evaluate whether early childhood body mass index (BMI) is an appropriate indicator for monogenic obesity.

Methods:

A cohort of n = 21 children living in Germany or Austria with monogenic obesity due to congenital leptin deficiency (group LEP, n = 6), leptin receptor deficiency (group LEPR, n = 6) and primarily heterozygous MC4 receptor deficiency (group MC4R, n = 9) was analyzed. A control group (CTRL) was defined that consisted of n = 22 obese adolescents with no mutation in the above mentioned genes. Early childhood (0–5 years) BMI trajectories were compared between the groups at selected time points.

Results:

The LEP and LEPR group showed a tremendous increase in BMI during the first 2 years of life with all patients displaying a BMI >27 kg/m2 (27.2–38.4 kg/m2) and %BMIP95 (percentage of the 95th percentile BMI for age and sex) >140% (144.8–198.6%) at the age of 2 years and a BMI > 33 kg/m2 (33.3–45.9 kg/m2) and %BMIP95 > 184% (184.1–212.6%) at the age of 5 years. The MC4R and CTRL groups had a later onset of obesity with significantly lower BMI values at both time points (p < 0.01).

Conclusion:

As result of the investigation of early childhood BMI trajectories in this pediatric cohort with monogenic obesity we suggest that BMI values >27.0 kg/m2 or %BMIP95 > 140% at the age of 2 years and BMI values >33.0 kg/m2 or %BMIP95 > 184% at the age of 5 years may be useful cut points to identify children who should undergo genetic screening for monogenic obesity due to functionally relevant mutations in the leptin gene or leptin receptor gene.

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Acknowledgements

Funding

The study was funded by the German Ministry of Education and Research (BMBF) and is integrated in the Competence Network Obesity (FKZ 01GI1120A).

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Correspondence to Martin Wabitsch.

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Kohlsdorf, K., Nunziata, A., Funcke, JB. et al. Early childhood BMI trajectories in monogenic obesity due to leptin, leptin receptor, and melanocortin 4 receptor deficiency. Int J Obes 42, 1602–1609 (2018). https://doi.org/10.1038/s41366-018-0049-6

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