human leukocyte antigen: meaning, definition, pronunciation and examples
Very Low (Specialist)Technical/Scientific/Medical
Quick answer
What does “human leukocyte antigen” mean?
A protein found on the surface of most cells in the human body that plays a crucial role in the immune system by helping it distinguish between self and non-self.
Audio
Pronunciation
Definition
Meaning and Definition
A protein found on the surface of most cells in the human body that plays a crucial role in the immune system by helping it distinguish between self and non-self.
Any of a complex group of cell-surface molecules, encoded by the major histocompatibility complex (MHC), responsible for presenting antigens to T-cells and thus central to adaptive immunity. Specific HLA types are strongly associated with susceptibility to autoimmune diseases, transplant rejection, and certain drug reactions.
Dialectal Variation
British vs American Usage
Differences
Primarily spelling: 'leucocyte' (British) vs. 'leukocyte' (American). The acronym 'HLA' is universal. The British spelling 'leucocyte' is less common in international scientific literature, which often defaults to the American spelling.
Connotations
No difference in connotation; both refer to the same precise scientific concept.
Frequency
The acronym 'HLA' is used with near-equal high frequency in both dialects within specialist contexts. The full term is used for definition and initial introduction.
Grammar
How to Use “human leukocyte antigen” in a Sentence
HLA is associated with [disease]Patients were typed for HLAA mismatch in HLA between donor and recipientThe gene encoding HLAVocabulary
Collocations
Examples
Examples of “human leukocyte antigen” in a Sentence
verb
British English
- The laboratory will **HLA-type** the potential donors.
- Patients are routinely **HLA-matched** prior to transplantation.
American English
- The lab needs to **HLA type** the donor sample.
- They **HLA-matched** the siblings to find the best fit.
adverb
British English
- The samples were analysed **HLA-specifically**. (Rare/Technical)
- The groups were **HLA-indistinguishably** similar. (Rare/Technical)
American English
- The test reacts **HLA-specifically**. (Rare/Technical)
- The tissues matched **HLA-perfectly**. (Rare/Technical)
adjective
British English
- The **HLA-compatible** donor was identified.
- This is an **HLA-associated** disease risk.
American English
- They found an **HLA compatible** match.
- Research focuses on **HLA associated** conditions.
Usage
Meaning in Context
Business
Not used.
Academic
Core term in immunology, genetics, and medical research papers. Example: 'The study investigated the association between specific HLA alleles and disease progression.'
Everyday
Virtually never used, except in highly specific contexts like a patient discussing organ transplant compatibility.
Technical
Essential term in clinical medicine (transplantation, rheumatology), immunology labs, and forensic science (paternity testing). Example: 'The HLA crossmatch was negative, permitting the transplant to proceed.'
Vocabulary
Synonyms of “human leukocyte antigen”
Neutral
Weak
Vocabulary
Antonyms of “human leukocyte antigen”
Watch out
Common Mistakes When Using “human leukocyte antigen”
- Pronouncing 'HLA' as individual letters (/eɪtʃ ɛl eɪ/) is less common than the initialism /ˌeɪtʃ.ɛlˈeɪ/.
- Using 'human leukocyte antigen' to refer to non-human MHC (e.g., in mice, it's H-2).
- Treating it as a countable noun incorrectly (e.g., 'He has a human leukocyte antigen'); it's a system/group of molecules.
FAQ
Frequently Asked Questions
No. Blood type (A, B, O, Rh) is a much simpler classification based on red blood cell antigens. HLA is a vastly more complex system involving proteins on almost all nucleated cells and is crucial for tissue/organ compatibility, not just blood transfusions.
The recipient's immune system will recognise a donor organ with mismatched HLA as 'foreign' and attack it, causing transplant rejection. Close HLA matching reduces this risk.
It can indicate genetic predisposition or strong association with certain (primarily autoimmune) diseases, like Type 1 diabetes, coeliac disease, or rheumatoid arthritis. It is a risk factor, not a definitive predictor.
Yes, identical (monozygotic) twins share 100% of their genes and therefore have identical HLA profiles, making them ideal transplant donors for each other, immunologically.
A protein found on the surface of most cells in the human body that plays a crucial role in the immune system by helping it distinguish between self and non-self.
Human leukocyte antigen is usually technical/scientific/medical in register.
Human leukocyte antigen: in British English it is pronounced /ˌhjuː.mən ˈluː.kə.saɪt ˈæn.tɪ.dʒən/, and in American English it is pronounced /ˌhjuː.mən ˈluː.kə.saɪt ˈæn.tɪ.dʒən/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None. The term is strictly technical.”
Learning
Memory Aids
Mnemonic
Think of HLA as the body's '**H**ighly **L**abelled **A**ddress' tag on cells, telling the immune system which cells belong ('self') and which are invaders ('non-self').
Conceptual Metaphor
A SECURITY BADGE or IDENTIFICATION CARD displayed by the body's cells. Friendly cells have the correct, recognised badge; infected or foreign cells have a missing or wrong badge, triggering an immune system alarm.
Practice
Quiz
What is the primary function of human leukocyte antigens (HLA)?