A Brief View on Hyperhomocysteinemia its Signs, Symptoms, Causes, Diagnosis and Treatment
Journal of Hematology & Thromboembolic Diseases

Journal of Hematology & Thromboembolic Diseases
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ISSN: 2329-8790

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Short Communication - (2021)Volume 9, Issue 10

A Brief View on Hyperhomocysteinemia its Signs, Symptoms, Causes, Diagnosis and Treatment

Azura Taylor*
*Correspondence: Azura Taylor, Department of Medicine, University of Sydney, Australia, Email:

Author info »


Hyperhomocysteinemia is an ailment portrayed by an unusually significant degree of homocysteine in the blood, customarily depicted as over 15 mol/L. As a result of the biochemical responses wherein homocysteine is involved, lacks of nutrient B6, folic corrosive (nutrient B9), and nutrient B12 can prompt high homocysteine levels. Hyperhomocysteinemia is normally made do with nutrient B6, nutrient B9 and nutrient B12 supplementation. Hyperhomocysteinemia is a danger factor for cardiovascular infection; nonetheless, enhancements of these nutrients may not further develop cardiovascular sickness results.

Signs and symptoms

Raised degrees of homocysteine have been related with various sickness states.

Cardiovascular dangers

Raised homocysteine is a referred to chance factor for cardiovascular sickness just as thrombosis. It has likewise been demonstrated to be related with microalbuminuria which is a solid pointer of the danger of future cardiovascular illness and renal dysfunction. Homocysteine corrupts and restrains the development of the three principle primary parts of courses: collagen, elastin and proteoglycans. In proteins, homocysteine for all time debases cysteine disulfide scaffolds and lysine amino corrosive residues, influencing design and capacity.

Neuropsychiatric disease

Proof exists connecting raised homocysteine levels with vascular dementia and Alzheimer's disease. There is additionally proof that raised homocysteine levels and low degrees of nutrient B6 and B12 are hazard factors for gentle intellectual hindrance and dementia. Oxidative pressure incited by homocysteine may likewise assume a part in schizophrenia.

Bone wellbeing

Raised degrees of homocysteine have likewise been connected to expanded breaks in older people. Homocysteine auto-oxidizes and responds with receptive oxygen intermediates, harming endothelial cells and expanding the danger of clots formation.

Ectopia lentis

Homocystinuria is the second most normal reason for heritable ectopia lentis. Homocystinuria is an autosomal latent metabolic problem frequently brought about by a close to nonappearance of cystathionine b-synthetase. It is related with scholarly handicap, osteoporosis, chest disfigurements, and expanded danger of thrombotic scenes. Focal point separation happens in 90% of patients, and is believed to be expected to diminish zonular trustworthiness because of the enzymatic imperfection. Focal point disengagement in homocystinuria is typically respective and in 60% of cases happens in the second rate or nasal course [1].


Vitamin deficiency

Lacks of nutrients B6, B9 and B12 can prompt high homocysteine levels.Vitamin B12 goes about as a cofactor for the chemical methionine synthase (which structures part of the S-adenosylmethionine (SAM) biosynthesis and recovery cycle). Nutrient B12 inadequacy forestalls the 5-methyltetrahydrofolate (5-MTHF) type of folate from being changed into THF due over to the "methyl trap". This upsets the folate pathway and prompts an expansion in homocysteine which harms cells (for instance, harm to endothelial cells can bring about expanded danger of apoplexy).


Constant utilization of liquor may likewise bring about expanded plasma levels of homocysteine.


Smokeless tobacco is ensnared as hazard factor for hyperhomocystemia. Smoking additionally causes hyperhomocystemia [2].


Homocysteine is a non-protein amino corrosive, integrated from methionine and either reused once more into methionine or changed over into cysteine with the guide of the B-bunch nutrients.

Around half of homocysteine (citation needed) is changed over back to methionine by remethylation by means of the methionine Around half of homocysteine (citation needed) is changed over back to methionine by remethylation by means of the methionine

One more pathway for the transformation of homocysteine back to methionine likewise exists, including methylation with trimethylglycine (additionally called betaine or truncated to TMG) as a methyl giver.

The excess homocysteine is transsulfurated to cysteine, with nutrient B6 as the co-factor.

Hereditary deformities in 5-MTHF reductase can thusly prompt hyperhomocysteinemia. The most well-known polymorphisms are known as MTHFR C677T and MTR A2756G. These polymorphisms happen in around 10% of the world's population. Elevations of homocysteine can likewise happen in the uncommon innate sickness homocystinuria [3]


A blood test can be performed to evaluate complete homocysteine focus in the plasma, of which roughly 80% is for the most part protein-bound. Order of hyperhomocysteinemia is characterized concerning serum focus as follows:

Moderate: 15–30 nmol/mL (or μmol/L)

Middle: 30–100 nmol/mL

Extreme: > 100 nmol/mL

In the event that complete homocysteine focus isn't observed to be raised, yet clinical doubt is still high, an oral methionine stacking challenge a few hours before measurement of homocysteine fixation might be utilized to expanded affectability for peripheral anomalies of homocysteine metabolism. Fasting for 10 hours is in some cases prescribed before estimation of homocysteine levels, yet this may not be fundamental for analytic yield.


Nutrients B6, B9, or B12 supplements (alone or consolidated), while they lower homocysteine level, don't change the danger of coronary illness or forestall passing in individuals who have coronary illness when contrasted with standard consideration or a to a latent enhancement in a clinical trial. When joined with medication to diminish pulse (antihypertensive medications), it isn't clear if medicines that lower homocysteine can assist with forestalling a stroke in some people. Hypotheses have been presented to address the disappointment of homocysteine-bringing treatments down to decrease cardiovascular occasions. At the point when folic corrosive is given as an enhancement, it might expand the development of blood vessel plaque. A subsequent theory includes the methylation of qualities in vascular cells by folic corrosive and nutrient B12, which may likewise speed up plaque development. At long last, adjusted methylation might catalyze l-arginine to lopsided dimethyl arginine, which is known to build the danger of vascular disease [4].


  1. Pizzorno J. Glutathione!. Integrative Medicine: A Clin J. 2014;13(1):8.
  2. Cullen CE, Carter GT, Weiss MD, Grant PA, Saperstein DS. Hypohomocysteinemia: a potentially treatable cause of peripheral neuropathology?. Physical medicine and rehabilitation clinics of North America. 2011;23(1):59-65.
  3. Zhang C, Cai Y, Adachi MT, Oshiro S, Kitajima S, Aso T, Kaufman RJ. Homocysteine induces programmed cell death in human vascular endothelial cells through activation of the unfolded protein response. J Bio Chem. 2001;276(38):35867-74.
  4. Jakubowski H. Molecular basis of homocysteine toxicity in humans. CMLS. 2004;61(4):470-87.

Author Info

Azura Taylor*
Department of Medicine, University of Sydney, Sydney, Australia

Citation: Taylor A (2021) A Brief View on Hyperhomocysteinemia its Signs, Symptoms, Causes, Diagnosis and Treatment. J Hematol Thrombo Dis 9:460. DOI: 10.24105/2329-8790.2021.9.460

Received: 03-Oct-2021 Accepted: 17-Oct-2021 Published: 24-Oct-2021 , DOI: 10.35248/2329-8790.21.9.460

Copyright: © 2021 Taylor A. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.