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2014 ; 36
(6
): 9733
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FNDC5 (irisin) gene and exceptional longevity: a functional replication study
with rs16835198 and rs726344 SNPs
#MMPMID25427998
Sanchis-Gomar F
; Garatachea N
; He ZH
; Pareja-Galeano H
; Fuku N
; Tian Y
; Arai Y
; Abe Y
; Murakami H
; Miyachi M
; Yvert T
; Santiago C
; Venturini L
; Fiuza-Luces C
; Santos-Lozano A
; Rodríguez-Romo G
; Ricevuti G
; Hirose N
; Emanuele E
; Lucia A
Age (Dordr)
2014[]; 36
(6
): 9733
PMID25427998
show ga
Irisin might play an important role in reducing the risk of obesity, insulin
resistance, or several related diseases, and high irisin levels may contribute to
successful aging. Thus, the irisin precursor (FNDC5) gene is a candidate to
influence exceptional longevity (EL), i.e., being a centenarian. It has been
recently shown that two single-nucleotide polymorphisms (SNPs) in the FNDC5 gene,
rs16835198 and rs726344, are associated with in vivo insulin sensitivity in
adults. We determined luciferase gene reporter activity in the two
above-mentioned SNPs and studied genotype distributions among centenarians
(n?=?175, 144 women) and healthy controls (n?=?347, 142 women) from Spain. We
also studied an Italian [79 healthy centenarians (40 women) and 316 healthy
controls (156 women)] and a Japanese cohort [742 centenarians (623 women) and 499
healthy controls (356 women)]. The rs726344 SNP had functional significance, as
shown by differences in luciferase activity between the constructs of this SNP
(all P???0.05), with the variant A-allele having higher luciferase activity
compared with the G-allele (P?=?0.04). For the rs16835198 SNP, the variant
T-allele tended to show higher luciferase activity compared with the G-allele
(P?=?0.07). However, we found no differences between genotype/allele frequencies
of the two SNPs in centenarians versus controls in any cohort, and no significant
association (using logistic regression adjusted by sex) between the two SNPs and
EL. Further research is needed with different cohorts as well as with additional
variants in the FNDC5 gene or in other genes involved in irisin signaling.