Haptoglobin Hp1 Variant Does Not Associate with Small Vessel Disease.

Area of Science:

• Neuroscience
• Genetics
• Cardiovascular Medicine

Background:

• Haptoglobin (Hp) is a plasma protein crucial for binding free hemoglobin and mitigating oxidative damage.
• Previous research suggested a link between the Hp1 allele and increased risk of severe cerebral small vessel disease.
• The Hp2 allele has been associated with cardiovascular complications.

Purpose of the Study:

• To investigate the association between haptoglobin (Hp) genotypes and cerebral small vessel disease in a first-ever stroke patient cohort.
• To replicate previous findings suggesting the Hp1 allele increases the risk of severe cerebral small vessel disease.

Main Methods:

• Haptoglobin (Hp) genotyping was performed using PCR and gel electrophoresis.
• Cerebral small vessel disease markers, including lacunar infarcts and white matter lesions (WML) graded by Fazekas, were assessed via MRI.
• The study included 316 patients from the Helsinki Stroke Aging Memory Study (SAM) and 1417 population controls.

Main Results:

• No significant differences were observed in the prevalence of severe white matter lesions (WML) across Hp1-1, Hp1-2, and Hp2-2 genotype carriers in the SAM cohort (p = 0.372).
• The occurrence of lacunar infarcts did not differ significantly between Hp genotype groups (p = 0.472).
• These findings remained consistent even when analyzing diabetic patients separately.

Conclusions:

• The Hp1 allele is not associated with an increased risk of developing cerebral small vessel disease.
• This study provides evidence against the Hp1 allele as a risk factor for stroke-related small vessel disease in the Finnish population.