Background: The nuclear receptors Rev-erb alpha and Rev-erb beta are transcription factors that regulate the
function of genes in glucose and lipid metabolism, and they also form a link between circadian rhythm and
metabolism. We evaluated the variations in Rev-erb alpha and Rev-erb beta genes together with biochemical
parameters as risk factors in type 2 diabetic (T2DM) patients.
Methods: Molecular analyses of Rev-erb alpha and Rev-erb beta genes were performed on genomic DNA by using
next-generation sequencing in 42 T2DM patients (21 obese and 21 non-obese) and 66 healthy controls.
Results: We found 26 rare mutations in the study groups, including 13 missense mutations, 9 silent mutations, 3
5′UTR variations, and a 3′UTR variation, of which 9 were novel variations (5 missense and 3 silent and 1 5′UTR).
Six common variations were also found in the Rev-erb genes; Rev-erb beta Chr3:24003765 A > G, Rev-erb beta
rs924403442 (Chr3:24006717) G > T, Rev-erb alpha Chr17:38253751 T > C, Rev-erb alpha rs72836608
C > A, Rev-erb alpha rs2314339 C > T and Rev-erb alpha rs2102928 C > T. Of these, Rev-erb beta
Chr3:24003765 A > G was a novel missense mutation (p.Q197R), while others were identified as intronic
T2DM patients with Rev-erb beta rs924403442 T allele had lower body surface area (BSA) than noncarriers
(GG genotype) (p = 0.039). Rev-erb alpha rs72836608 A allele and Rev-erb alpha rs2314339 CC genotype were
associated with decreased serum HDL-cholesterol levels in T2DM patients (p = 0.025 and p = 0.027, respectively).
In our study, different effects of Rev-erbs polymorphisms were found according to gender and presence of
obesity. Rev-erb alpha rs72836608 (C > A) and rs2314339 (C > T) and Rev-erb alpha rs2102928 (C > T) were
associated with low HDL-C levels in male T2DM patients. In female patients, Rev-erb alpha rs2102928 (C > T)
was associated with high microalbuminuria and Rev-erb beta rs9244403442 G > T was associated with low
HDL and high BSA values. In addition, Rev-erb alpha Chr17: 38,253,751 (T > C), rs72836608 (C > A), and
rs2314339 (C > T) and Rev-erb beta Chr3:24003765 (A > G) were associated with increased serum GGT levels
in obese T2DM patients. In non-obese patients, Rev-erbs SNPs had no effect on serum GGT levels.
Conclusion: Our findings indicate that variations in the Rev-erb alpha and Rev-erb beta genes can affect metabolic
changes in T2DM and these effects may vary depending on gender and obesity.