Fiche publication
Date publication
juillet 2017
Journal
Clinical genetics
Auteurs
Membres identifiés du Cancéropôle Est :
Pr GUEANT Jean-Louis
Tous les auteurs :
Guéant-Rodriguez RM, Chery C, Fofou-Caillierez BM, Voirin J, Foliguet B, Josse T, Tramoy D, François F, Guéant JL
Lien Pubmed
Résumé
Folate and vitamin B12 are needed for the proper embryo-fetal development possibly through their interacting role in the one-carbon metabolism. Folate fortification reduces the prevalence of complex birth defects, and more specifically neural tube defects (NTD). GIF and FUT2 are two genes associated with the uptake and blood level of vitamin B12. We evaluated GIF and FUT2 as predictors of severe birth defects, in 181 aborted fetuses compared to 375 healthy newborns. The GIF290C allele frequency was estimated to 0.4% in healthy newborns and to 8.1% in NTD fetuses (odds ratio 17.8 (95% CI: 4.0-77.6)). The frequency of FUT2 rs601338 secretor variant was not different among groups. The GIF 290C heterozygous /FUT2 rs601338 secretor variant combined genotype was reported in 6 of the 37 NTD fetuses, but not in other fetuses and healthy newborns (P<0.0001). This GIF/FUT2 combined genotype has been previously reported in children with congenital GIF deficiency, with respective consequences on B12 binding activity and GIF secretion. In conclusion, a genotype reported in congenital GIF deficiency produces also severe forms of NTD. This suggests that vitamin B12 delivery to neural tissue by the CUBN/GIF pathway could play a role in the neural tube closure mechanisms.
Mots clés
FUT2, 1-carbon metabolism, birth defects, gastric intrinsic factor, neural tube defects, vitamin B12
Référence
Clin. Genet.. 2017 Jul;:
