MTNR1B SNP*Food Timing Interaction on Glucose Control (ONTIME-MT)

Universidad de Murcia

Status: Unknown

Conditions: Non-Diabetic Disorder of Endocrine Pancreas

Treatments: Behavioral: Early OGTT; Behavioral: Late OGTT

Study type: Interventional

Funder types: Other

Identifiers

NCT03036592

2017ES00001

Details and patient eligibility

About

The purpose of this investigation is to assess the role of melatonin receptor 1B (MTNR1B) single nucleotide polymorphism (SNP)*food timing interaction on glucose control in the deleterious effect in a vulnerable population with regular exposure to concurrent high melatonin and food intake as late night eaters (those having dinner within 2.5 h before their usual bed time). With the results from this study, we expect to advance our understanding of the role of endogenous melatonin on glucose metabolism in late night eaters and carriers of the MTNR1B risk allele, with potential implications on the guidelines to mitigate risk of type 2 diabetes in late night eaters and carriers of the MTNR1B risk allele.

Full description

Late-night dinner eating is associated with increased risk for type-2-diabetes. The underlying mechanism is unclear. One explanatory hypothesis is that the concurrence of elevated circulating melatonin and high glucose concentrations (characterizing late-eating) leads to impaired glucose-tolerance. However, to date, no study has tested the influence of physiological melatonin concentrations on glucose tolerance. The discovery of melatonin receptor MTNR1B as a diabetes risk gene provides evidence for a role of physiological levels of melatonin in glucose control.

The aim of the current study is to test the hypothesis that the concurrence of meal timing with elevated endogenous melatonin concentrations results in impaired glucose control and that this effect is stronger in homozygous MTNR1B risk carriers than in non-carriers. To do so we will test glucose tolerance using identical mixed meals under two glucose oral tolerance test (OGTT) conditions: a) delayed OGTT or Late Eating (LE): starting1 hour before their usual bed time, b) advanced OGTT or Early Eating (EE): starting 4 hours before habitual bed time, in a randomized, cross-over study design.

These findings could support a clinical application for the screening of this SNP and the possibility of implementing tailored and cost-effective behavioral interventions to prevent type 2 diabetes in vulnerable populations.

These goals will be achieved through a specific approach:

• Interventional (randomized, cross-over controlled trials) (Aim 1): To study the potential interaction between meal timing (dinner) and genetic variants MTNR1B for glucose tolerance in obese women (n=1000).

Enrollment: 1,000 estimated patients

Sex: All

Ages: 18 to 65 years old

Volunteers: Accepts Healthy Volunteers

Inclusion and exclusion criteria

IInclusion Criteria:

• Body Mass Index: > 18.5 o < 40 kg/m2
• Age: between 18 and 65 year of age
• Caucasian
• Day workers

Exclusion Criteria:

• Receiving treatment with thermogenic, lipogenic, or drugs
• Diabetes mellitus, chronic renal failure, hepatic diseases, or cancer diagnosis
• Bulimia diagnosis, prone to binge eating
• Undergoing treatment with Type 2 diabetes mellitus (high blood sugar) medications such as Metformin or other non-Metformin oral anti-diabetic drugs such as sulfonylureas, meglitinides, or glitazones
• Undergoing treatment with Corticosteroids/steroids, Growth hormone, Anticoagulant medicines, or blood thinners, Beta blockers for hypertension, Medications for sleep, Fluvoxamine, Opioids or Amphetamines, Tranquilizers, nonsteroidal anti-inflammatory drugs.
• Pregnant

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: None (Open label)

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1,000 participants in 3 patient groups

MTNR1B CC

Experimental group

Description:

Test glucose tolerance in homozygous non-carriers (CC) for MTNR1B rs10830963 in Early OGTT and Late OGTT

Treatment:

Behavioral: Late OGTT

Behavioral: Early OGTT

MTNR1B GG

Experimental group

Description:

Test glucose tolerance in homozygous (GG) risk allele carriers for MTNR1B rs10830963 in Early OGTT and Late OGTT

Treatment:

Behavioral: Late OGTT

Behavioral: Early OGTT

MTNR1B CG

Experimental group

Description:

Test glucose tolerance in heterozygous (CG) risk allele carriers for MTNR1B rs10830963 in Early OGTT and Late OGTT

Treatment:

Behavioral: Late OGTT

Behavioral: Early OGTT