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    The prolactin (PRL) system plays important behavioral, social, and metabolic roles, such as mediating social bonding and insulin secretion. Inherited dysfunction of the PRL pathway-related genes is associated with psychopathology and insulin resistance. We have previously suggested that the PRL system might be implicated in the comorbidity of psychiatric (depression) and type 2 diabetes (T2D) owing to the pleiotropy of PRL pathway-related genes. To our knowledge, no PRL variants have so far been reported in patients with either major depressive disorder (MDD) and/or T2D. In this study, we analyzed 6 variants within the PRL gene and tested them for the presence of parametric linkage and/or linkage disequilibrium (LD, i.e., linkage and association) with familial MDD, T2D, and their comorbidity. We found, for the first time, that the PRL gene and its novel risk variants are linked to and in LD (i.e., linkage and association) with familial MDD, T2D, and MDD-T2D comorbidity. PRL might play a key role in mental-metabolic comorbidity and can be considered a novel gene in MDD and T2D.


    M Amin, R Wu, T T Postolache, C Gragnoli. Novel implication of the prolactin (PRL) gene in the comorbidity of type 2 diabetes and depression. European review for medical and pharmacological sciences. 2023 May;27(9):4080-4084

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    PMID: 37203833

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