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Rapid Review: HLA Associations List

TL;DR

The Rapid Review: HLA Associations List is a high-yield topic for MRCP Part 1, frequently tested in immunology and rheumatology. Focus on a core group of associations—especially B27, DR3, DR4, and DQ2/DQ8—and understand patterns rather than memorising blindly. Regular MCQ practice and mnemonics are the most efficient way to secure marks from this recall-heavy area.


Why this matters

In MRCP Part 1, HLA associations are classic “easy marks”—provided you revise them correctly. These associations link immunogenetics with real clinical diseases and commonly appear in single-best-answer questions.

Rather than memorising an exhaustive list, the exam rewards pattern recognition and prioritisation of high-yield associations. This guide aligns with the MRCP Part 1 overview and focuses on exam-relevant recall.


Core sections

1. What are HLA Associations?

Human Leukocyte Antigens (HLA) are cell-surface proteins involved in antigen presentation. Certain HLA alleles are strongly associated with autoimmune and inflammatory diseases.

For MRCP Part 1, remember:

  • They indicate genetic susceptibility, not diagnosis

  • Associations are often disease-specific patterns

  • Questions are typically direct recall or clinical vignette-based

2. High-Yield HLA Associations (Must-Know Table)

HLA Type

Key Disease Associations

HLA-B27

Ankylosing spondylitis, reactive arthritis, psoriatic arthritis, IBD-associated arthritis

HLA-DR3

SLE, Graves’ disease, type 1 diabetes, myasthenia gravis

HLA-DR4

Rheumatoid arthritis

HLA-DQ2/DQ8

Coeliac disease

HLA-B51

Behçet’s disease

HLA-DR2

Multiple sclerosis, Goodpasture’s syndrome

HLA-DR5

Hashimoto thyroiditis

HLA-B8

Myasthenia gravis, Addison’s disease

HLA-DQ6

Narcolepsy

HLA-DR7

Weak association with haemochromatosis

👉 Prioritise B27, DR3, DR4, and DQ2/DQ8—these are repeatedly tested.

3. The 5 Most Tested HLA Associations

1. HLA-B27 → Seronegative spondyloarthropathies

  • Ankylosing spondylitis (strongest link)

  • Reactive arthritis

  • Psoriatic arthritis

  • Enteropathic arthritis

💡 Exam clue: Young patient with inflammatory back pain and sacroiliitis

2. HLA-DR4 → Rheumatoid arthritis

  • Associated with more severe disease

  • Often correlates with anti-CCP positivity

💡 Common trap: Confusing DR4 with DR3

3. HLA-DQ2/DQ8 → Coeliac disease

  • Present in >95% of patients

  • Useful for exclusion if absent

💡 Exam clue: Iron deficiency anaemia + villous atrophy

4. HLA-DR3 → Autoimmune cluster

  • SLE

  • Graves’ disease

  • Type 1 diabetes

💡 Think: “multi-autoimmune predisposition”

5. HLA-B51 → Behçet’s disease

  • Oral ulcers

  • Genital ulcers

  • Uveitis

💡 Often appears in clinical vignette questions

4. Mnemonics for Rapid Recall

  • B27 = “Back problems at 27” → spondyloarthropathies

  • DR3 = “3 autoimmune diseases” → SLE, Graves’, T1DM

  • DQ2 = “Digestive = coeliac”

  • DR4 = “Rheumatoid = 4 letters”

5. Rapid Revision Strategy

  1. Memorise top 10 associations

  2. Group by disease category (rheumatology, endocrine, GI)

  3. Use spaced repetition

  4. Practise using Free MRCP MCQs

  5. Reinforce under exam conditions via Start a mock test


Practical examples / mini-cases

Mini Case

A 30-year-old man presents with chronic lower back pain improving with exercise. Examination reveals reduced spinal mobility, and imaging shows sacroiliitis.

Question: Which HLA type is most strongly associated?

Answer: HLA-B27

Explanation: This presentation is typical of ankylosing spondylitis. HLA-B27 is strongly associated and appears frequently in MRCP Part 1 questions as a direct recall item.


Medical student revising HLA associations for MRCP Part 1 with notes and highlighted key concepts

Common pitfalls (5 bullets)

  • Confusing DR3 (autoimmune diseases) with DR4 (rheumatoid arthritis)

  • Assuming HLA testing confirms diagnosis (it does not)

  • Forgetting DQ2/DQ8 in coeliac disease

  • Overlearning rare associations instead of core ones

  • Misapplying B27 to unrelated autoimmune conditions


FAQs

1. Which HLA association is most important for MRCP Part 1?

HLA-B27 is the most commonly tested, particularly in ankylosing spondylitis and related disorders.

2. Is HLA testing diagnostic?

No. HLA types indicate susceptibility, not diagnosis. Clinical and laboratory findings remain essential.

3. How many HLA associations should I learn?

Focus on 8–12 high-yield associations. This covers the majority of MRCP Part 1 questions.

4. Are HLA questions common in the exam?

Yes, especially within immunology and rheumatology sections, often as straightforward recall questions.

5. What is the best way to revise HLA associations?

Use mnemonics, spaced repetition, and consistent MCQ practice rather than one-time memorisation.


Ready to start?

Consolidate your knowledge with active recall—start practising using Free MRCP MCQs and test your readiness with a Start a mock test. For a structured roadmap, revisit the MRCP Part 1 overview and integrate this topic into your immunology revision.


Sources

 
 
 

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