Publications by authors named "Shahana Sengupta"

2 Publications

  • Page 1 of 1

Linking the obesity rs1421085 variant circuitry to cellular, metabolic, and organismal phenotypes in vivo.

Sci Adv 2021 Jul 21;7(30). Epub 2021 Jul 21.

Mammalian Genetics Unit, MRC Harwell Institute, Oxfordshire OX11 0RD, UK.

Variants in FTO have the strongest association with obesity; however, it is still unclear how those noncoding variants mechanistically affect whole-body physiology. We engineered a deletion of the rs1421085 conserved cis-regulatory module (CRM) in mice and confirmed in vivo that the CRM modulates and gene expression and mitochondrial function in adipocytes. The CRM affects molecular and cellular phenotypes in an adipose depot-dependent manner and affects organismal phenotypes that are relevant for obesity, including decreased high-fat diet-induced weight gain, decreased whole-body fat mass, and decreased skin fat thickness. Last, we connected the CRM to a genetically determined effect on steroid patterns in males that was dependent on nutritional challenge and conserved across mice and humans. Together, our data establish cross-species conservation of the rs1421085 regulatory circuitry at the molecular, cellular, metabolic, and organismal level, revealing previously unknown contextual dependence of the variant's action.
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http://dx.doi.org/10.1126/sciadv.abg0108DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8294759PMC
July 2021

Type 2 diabetes risk alleles in PAM impact insulin release from human pancreatic β-cells.

Nat Genet 2018 08 27;50(8):1122-1131. Epub 2018 Jul 27.

Oxford Centre for Diabetes, Endocrinology & Metabolism, University of Oxford, Oxford, UK.

The molecular mechanisms underpinning susceptibility loci for type 2 diabetes (T2D) remain poorly understood. Coding variants in peptidylglycine α-amidating monooxygenase (PAM) are associated with both T2D risk and insulinogenic index. Here, we demonstrate that the T2D risk alleles impact negatively on overall PAM activity via defects in expression and catalytic function. PAM deficiency results in reduced insulin content and altered dynamics of insulin secretion in a human β-cell model and primary islets from cadaveric donors. Thus, our results demonstrate a role for PAM in β-cell function, and establish molecular mechanisms for T2D risk alleles at this locus.
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http://dx.doi.org/10.1038/s41588-018-0173-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6237273PMC
August 2018
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