[A descriptive analysis on type 2 diabetes in twins in China]

Area of Science:

• Genetics
• Epidemiology
• Endocrinology

Background:

• Type 2 diabetes (T2D) is a complex metabolic disorder with suspected genetic and environmental influences.
• Understanding the relative contributions of these factors is crucial for effective prevention and management strategies.
• Twin studies offer a powerful approach to disentangle genetic and environmental effects on disease prevalence.

Purpose of the Study:

• To investigate the distribution and concordance rates of T2D in a large twin cohort within the Chinese National Twin Registry (CNTR).
• To provide evidence for the roles of genetic and environmental factors in T2D etiology.
• To analyze T2D prevalence and concordance across different demographic and geographic subgroups.

Main Methods:

• Analysis of 18,855 twin pairs (≥30 years) from the CNTR (2010-2018).
• Inclusion of monozygotic (MZ) and dizygotic (DZ) twin pairs with complete registration data.
• Application of a random effect model to assess population distribution, regional characteristics, and T2D concordance within twin pairs.

Main Results:

• The overall self-reported T2D prevalence was 2.2%, with no significant difference between MZ and DZ twins.
• T2D concordance rates were substantially higher in MZ twins (38.2%) compared to DZ twins (16.0%) (P<0.001).
• Higher concordance in MZ twins was observed across genders, age groups, and regions, with specific variations noted in Northern and Southern China based on age and sex.

Conclusions:

• The study highlights a significant role for genetic factors in T2D prevalence among Chinese twins.
• Observed differences in concordance rates between MZ and DZ twins suggest heritability of T2D.
• The influence of genetic factors on T2D may vary across different populations, age groups, and geographical locations.