Heterozygous versus homozygous phenotype caused by the same MC4R mutation: novel mutation affecting a large consanguineous kindred
2018
Background
The hypothalamic G-protein-coupled-receptor melanocortin-4 receptor (MC4R) is a key player in the central circuit regulating energy expenditure and appetite. Heterozygous loss-of-function MC4R mutations are the most common known genetic cause of monogenic human obesity, with more than 200 mutations described to date, affecting 2–3% of the population in various cohorts tested. Homozygous or compound heterozygous MC4R mutations are much less frequent, and only few families have been described in which heterozygotes and homozygotes of the same mutation are found.
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