Oligogenic inheritance in severe adult obesity

Abstract

Background/objective: The genetic architecture of extreme non-syndromic obesity in adults remains to be elucidated. A range of genes are known to cause monogenic obesity, but even when pathogenic mutations are present, there may be variable penetrance.

Methods: Whole-exome sequencing (WES) was carried out on a 15-year-old male proband of Pakistani ancestry who had severe obesity. This was followed by family segregation analysis, using Sanger sequencing. We also undertook re-analysis of WES data from 91 unrelated adults with severe obesity (86% white European ancestry) from the Personalised Medicine for Morbid Obesity (PMMO) cohort, recruited from the UK National Health Service.

Results: We identified an oligogenic mode of inheritance of obesity in the proband's family-this provided the impetus to reanalyze existing sequence data in a separate dataset. Analysis of PMMO participant data revealed two further patients who carried more than one rare, predicted-deleterious mutation in a known monogenic obesity gene. In all three cases, the genes involved had known autosomal dominant inheritance, with incomplete penetrance.

Conclusion: Oligogenic inheritance may explain some of the variable penetrance in Mendelian forms of obesity. We caution clinicians and researchers to avoid confining sequence analysis to individual genes and, in particular, not to stop looking when the first potentially-causative mutation is found.

Fig. 1. Sanger Sequencing Chromatograms and Family Pedigree of Proband 1.

A Chromatograms of Sanger sequencing demonstrating heterozygosity for SH2B1:c.539 C > T in the proband and his healthy parents. B Chromatogram of Sanger sequencing demonstrating heterozygosity for POGZ:c.3280 C > T in the proband and his healthy father. C Chromatogram of Sanger sequencing demonstrating heterozygosity for MBD5:c.3539 A > T in the proband and his healthy mother. D Pedigree of the family and the putatively deleterious variants in each individual.