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No response to Vitamin D was 11 X more likely to have if poor Binding gene – Sept 2022

European Journal of Clinical Nutrition (2022) https://doi.org/10.1038/s41430-022-01218-y
Mariem Ammar, Syrine Heni, Mohamed Sahbi Tira, Yassine Khalij, Haithem Hamdouni, Dorra Amor, Sonia Ksibi, Asma Omezzine & Ali Bouslama

The aim of this study was to determine the influence of polymorphisms in some key gene actors of the vitamin D (vitD) metabolic pathway on supplementation efficacy.

Methods
In total, 245 healthy participants were recruited from occupational medicine service in Sahloul University Hospital with vitD deficiency [25(OH)D ≤ 30 ng/ml]. After giving an informed consent, all participants were asked to complete a generalized questionnaire and to follow a detailed personalized supplementation protocol. Genetic study was performed by PCR-RFLP for 15 single nucleotide polymorphisms (SNPs) belonging to DBP, CYP2R1, CYP27B14, CYP24A1 and VDR genes. Statistical study was carried out with SPSS23.0.

Results
Among the studied SNPs, non-response was significantly associated with variant alleles of

  • rs4588 (OR* = 11.51; p < 0.001),
  • rs10766197 (OR* = 6.92; p = 0.008) and
  • rs12794714 (OR* = 5.09; p = 0.004).

These three SNPs contributed in 18.8% in response variability with rs4588 being the most influential (10.3%). There was a significant linear negative correlation between baseline 25(OH)D and post supplementation 25(OH)D concentration (r = −0.437; p < 0.001) as well as a linear negative association between the increase in 25(OH)D concentration and GRS (GRS: genetic risk score = the sum of risk alleles) (r = −0.149; p = 0.033).

Conclusions
DBP-rs4588, CYP2R1-rs10766197 and (CYP2R1)-rs12794714 variants are associated with variations in serum 25(OH)D concentrations and efficacy of response to vitD supplementation in Tunisian adults. Taking into account these variations can help to better adapt vitD intake to ensure a higher response to supplementation.

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VitaminDWiki - Genetics category contains

344 articles in the Genetics category

see also

Vitamin D blood test misses a lot
in Visio for 2023

  • Vitamin D from coming from tissues (vs blood) was speculated to be 50% in 2014, and by 2017 was speculated to be 90%
  • Note: Good blood test results (> 40 ng) does not mean that a good amount of Vitamin D actually gets to cells
  • A Vitamin D test in cells rather than blood was feasible (2017 personal communication)   Commercially available 2019
    • However, test results would vary in each tissue due to multiple genes
  • Good clues that Vitamin D is being restricted from getting to the cells
    1) A vitamin D-related health problem runs in the family
        especially if it is one of 51+ diseases related to Vitamin D Receptor
    2) Slightly increasing Vitamin D shows benefits (even if conventional Vitamin D test shows an increase)
    3) DNA and VDR tests - 100 to 200 dollars $100 to $250
    4) PTH bottoms out ( shows that parathyroid cells are getting Vitamin d)
       Genes are good, have enough Magnesium, etc.
    5) Back Pain
       probably want at least 2 clues before taking adding vitamin D, Omega-3, Magnesium, Resveratrol, etc
      • The founder of VitaminDWiki took action with clues #3&5

VitaminDWiki - Vitamin D Binding Protein category listing has 178 items

Vitamin D Binding Protein (GC) gene can decrease the bio-available Vitamin D that can get to cells,

  • GC is not the only such gene - there are 3 others, all invisible to standard Vitamin D tests
  • The bio-available calculation does not notice the effect of GC, CYP27B1, CYP24A1, and VDR
  • The actual D getting to the cells is a function of measured D and all 4 genes
  • There is >2X increase in 8+ health problems if have poor VDBP (GC)
  • It appears that VDBP only blocks oral vitamin D,

VitaminDWiki - Non-oral Vitamin D should be a better form for MS, food allergy, PTSD, etc. – many studies bypasses Binding Protein limitation

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No response to Vitamin D was 11 X more likely to have if poor Binding gene – Sept 2022        
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