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Diabetic Retinopathy

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...

Type II Diabetes II: Pathophysiology

Type II Diabetes II: Pathophysiology

PathophysiologyType 2 diabetes mellitus (T2DM ) is a chronic metabolic disorder characterized by insulin resistance and progressive pancreatic β-cell dysfunction, leading to impaired glucose homeostasis. It results from interactions among genetic predisposition, environmental factors, and metabolic stressors, such as overnutrition and a sedentary lifestyle.Insulin Resistance and Glucose DysregulationEarly T2DM involves insulin resistance in skeletal muscle, adipose tissue, and the liver.

Type I Diabetes II: Pathophysiology

Type I Diabetes II: Pathophysiology

Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular...

Diabetic Nephropathy

Diabetic Nephropathy

Definition Diabetic nephropathy is a chronic kidney complication that results from prolonged hyperglycemia.Prevalence It is the most common cause of chronic kidney disease (CKD) and end-stage renal disease (ESRD) worldwide, affecting up to half of individuals with diabetes.Pathophysiology • Sustained hyperglycemia triggers multiple hemodynamic and metabolic changes in the kidney. • Early in the disease, increased renal blood flow and glomerular hyperfiltration...

Diabetes Mellitus: Type 2 and Gestational

Diabetes Mellitus: Type 2 and Gestational

Type 2 diabetes, characterized by insulin resistance, arises when the insulin receptors on cells lose responsiveness to insulin, diminishing the cell's capacity to take up glucose, resulting in elevated blood glucose levels. To receive a diagnosis of Type 2 diabetes, a series of blood glucose tests are necessary to assess whether the blood glucose falls within normal parameters. If the result is out of the normal range, a patient may be diagnosed as prediabetic or diabetic, depending on the...

Type II Diabetes I: Introduction

Type II Diabetes I: Introduction

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disorder characterized by insulin resistance, in which target tissues such as the liver, muscle, and adipose tissue respond poorly to insulin. It is also associated with inadequate compensatory insulin secretion, where pancreatic β-cells fail to produce sufficient insulin. Together, these abnormalities lead to persistent hyperglycemia.EtiologyT2DM develops through a complex interaction of genetic predisposition and environmental or...

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Author Spotlight: Understanding Retinal Vessel Resilience and Disease Progression

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Gene-Lifestyle Synergy in Diabetic Retinopathy Development.

Shaopeng Yang¹, Zhuoyao Xin², Baichen Liu¹

¹State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangdong Provincial Clinical Research Center for Ocular Diseases, Guangdong Basic Research Center of Excellence for Major Blinding Eye Diseases Prevention and Treatment, Sun Yat-Sen University, Guangzhou, China.

|April 29, 2026

Summary

High genetic risk increases diabetic retinopathy (DR) risk, but healthy lifestyle choices can significantly lower it. Universal interventions are recommended for DR prevention in all individuals.

Keywords:

Diabetic retinopathy (DR)Joint effect Lifestyle Machine learning (ML)Polygenic risk

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Area of Science:

Genetics and Ophthalmology
Public Health and Preventive Medicine
Computational Biology and Bioinformatics

Background:

Diabetic retinopathy (DR) is a leading cause of vision loss in diabetic patients.
Genetic predisposition and lifestyle factors are known contributors to DR development.
A comprehensive understanding of their interplay is crucial for effective prevention strategies.

Purpose of the Study:

To develop a machine learning (ML)-driven polygenic risk score (PRS) for DR.
To assess the impact of lifestyle modifications on mitigating genetically predicted DR risk.
To investigate the combined effects of genetic risk and lifestyle on DR incidence.

Main Methods:

A multicenter, multiethnic cohort study utilizing UK Biobank and Guangzhou Diabetic Eye Study data.
Systematic literature review to identify 182 DR-associated single nucleotide polymorphisms for ML-PRS construction.
Lifestyle adherence scored based on smoking, weight, physical activity, and sleep, categorized as favorable, intermediate, or unfavorable.

Main Results:

High genetic risk elevated DR risk by 37% (HR=1.37), while unfavorable lifestyle increased risk by 49% (HR=1.49), independent of each other.
High genetic risk and unfavorable lifestyle synergistically more than doubled DR risk (HR=2.09).
A favorable lifestyle reduced DR risk by 44% in high-genetic-risk individuals, lowering incidence from 7.5% to 4.6%.

Conclusions:

Both genetic predisposition and modifiable lifestyle factors independently and jointly influence DR risk.
Lifestyle interventions are effective in reducing DR risk, particularly in genetically susceptible individuals.
Universal behavioral interventions are recommended for DR prevention across all genetic backgrounds.