To evaluate whether early childhood body mass index (BMI) is an appropriate indicator for monogenic obesity.
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.
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).
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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The study was funded by the German Ministry of Education and Research (BMBF) and is integrated in the Competence Network Obesity (FKZ 01GI1120A).
Conflict of interest
The authors declare that they have no conflict of interest.
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