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                <term xml:lang="en">onset obesity</term>
                <term xml:lang="en">melanocortin pathway</term>
                <term xml:lang="en">leptin</term>
                <term xml:lang="en">Severe early</term>
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              <classCode scheme="halDomain" n="sdv">Life Sciences [q-bio]</classCode>
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              <p>Abstract Context Unlike homozygous variants, the implication of heterozygous variants on the leptin–melanocortin pathway in severe obesity has not been established. Objective To describe the frequency, the phenotype, and the genotype–phenotype relationship for heterozygous variants in LEP, LEPR, POMC, and PCSK1 in severe obesity. Methods In this retrospective study, genotyping was performed on at least 1 of the LEP, LEPR, POMC, and PCSK1 genes in 1486 probands with severe obesity (600 children, 886 adults). The phenotype was collected in 60 subjects with heterozygous variants and 16 with homozygous variants. We analyzed variant frequency, body mass index (BMI), age of obesity onset, food impulsivity, and endocrine abnormalities. Results The frequency of subjects with homozygous variants was 1.7% (n = 26), and 6.7% (n = 100) with heterozygous variants. Adults with homozygous variants had a higher BMI (66 vs 53 kg/m2, P = .015), an earlier onset of obesity (0.4 vs 5.4 years, P &amp;lt; .001), more often food impulsivity (83% vs 42%, P = .04), and endocrine abnormalities (75% vs 26%, P &amp;lt; .01). The BMI was higher for subjects with high-impact heterozygous variants (61 vs 50 kg/m², P = .045) and those with a second heterozygous variant on the pathway (65 vs 49 kg/m², P &amp;lt; .01). In children, no significant differences were found for the age of obesity onset and BMI. Conclusion Heterozygous variants in LEP, LEPR, POMC, and PCSK1 are frequent in severe obesity and sometimes associated with a phenotype close to that of homozygotes. These data suggest a systematic search for variants in severe early-onset obesity, to discuss therapy that targets this key pathway.</p>
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