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Genetics Home Reference: your guide to understanding genetic conditions
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Leukocyte adhesion deficiency type 1

Reviewed April 2014

What is leukocyte adhesion deficiency type 1?

Leukocyte adhesion deficiency type 1 is a disorder that causes the immune system to malfunction, resulting in a form of immunodeficiency. Immunodeficiencies are conditions in which the immune system is not able to protect the body effectively from foreign invaders such as viruses, bacteria, and fungi. Starting from birth, people with leukocyte adhesion deficiency type 1 develop serious bacterial and fungal infections.

One of the first signs of leukocyte adhesion deficiency type 1 is a delay in the detachment of the umbilical cord stump after birth. In newborns, the stump normally falls off within the first two weeks of life; but, in infants with leukocyte adhesion deficiency type 1, this separation usually occurs at three weeks or later. In addition, affected infants often have inflammation of the umbilical cord stump (omphalitis) due to a bacterial infection.

In leukocyte adhesion deficiency type 1, bacterial and fungal infections most commonly occur on the skin and mucous membranes such as the moist lining of the nose and mouth. In childhood, people with this condition develop severe inflammation of the gums (gingivitis) and other tissue around the teeth (periodontitis), which often results in the loss of both primary and permanent teeth. These infections often spread to cover a large area. A hallmark of leukocyte adhesion deficiency type 1 is the lack of pus formation at the sites of infection. In people with this condition, wounds are slow to heal, which can lead to additional infection.

Life expectancy in individuals with leukocyte adhesion deficiency type 1 is often severely shortened. Due to repeat infections, affected individuals may not survive past infancy.

How common is leukocyte adhesion deficiency type 1?

Leukocyte adhesion deficiency type 1 is estimated to occur in 1 per million people worldwide. At least 300 cases of this condition have been reported in the scientific literature.

What genes are related to leukocyte adhesion deficiency type 1?

Mutations in the ITGB2 gene cause leukocyte adhesion deficiency type 1. This gene provides instructions for making one part (the β2 subunit) of at least four different proteins known as β2 integrins. Integrins that contain the β2 subunit are found embedded in the membrane that surrounds white blood cells (leukocytes). These integrins help leukocytes gather at sites of infection or injury, where they contribute to the immune response. β2 integrins recognize signs of inflammation and attach (bind) to proteins called ligands on the lining of blood vessels. This binding leads to linkage (adhesion) of the leukocyte to the blood vessel wall. Signaling through the β2 integrins triggers the transport of the attached leukocyte across the blood vessel wall to the site of infection or injury.

ITGB2 gene mutations that cause leukocyte adhesion deficiency type 1 lead to the production of a β2 subunit that cannot bind with other subunits to form β2 integrins. Leukocytes that lack these integrins cannot attach to the blood vessel wall or cross the vessel wall to contribute to the immune response. As a result, there is a decreased response to injury and foreign invaders, such as bacteria and fungi, resulting in frequent infections, delayed wound healing, and other signs and symptoms of this condition.

Related Gene(s)

Changes in this gene are associated with leukocyte adhesion deficiency type 1.

  • ITGB2

How do people inherit leukocyte adhesion deficiency type 1?

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Where can I find information about diagnosis or management of leukocyte adhesion deficiency type 1?

These resources address the diagnosis or management of leukocyte adhesion deficiency type 1 and may include treatment providers.

  • Genetic Testing Registry: Leukocyte adhesion deficiency type 1 (http://www.ncbi.nlm.nih.gov/gtr/conditions/C1861766)
  • MedlinePlus Encyclopedia: Gingivitis (http://www.nlm.nih.gov/medlineplus/ency/article/001056.htm)
  • MedlinePlus Encyclopedia: Immunodeficiency Disorders (http://www.nlm.nih.gov/medlineplus/ency/article/000818.htm)
  • Primary Immune Deficiency Treatment Consortium (http://primaryimmune.org/)

You might also find information on the diagnosis or management of leukocyte adhesion deficiency type 1 in Educational resources (http://www.ghr.nlm.nih.gov/condition/leukocyte-adhesion-deficiency-type-1/show/Educational+resources) and Patient support (http://www.ghr.nlm.nih.gov/condition/leukocyte-adhesion-deficiency-type-1/show/Patient+support).

General information about the diagnosis (http://ghr.nlm.nih.gov/handbook/consult/diagnosis) and management (http://ghr.nlm.nih.gov/handbook/consult/treatment) of genetic conditions is available in the Handbook. Read more about genetic testing (http://ghr.nlm.nih.gov/handbook/testing), particularly the difference between clinical tests and research tests (http://ghr.nlm.nih.gov/handbook/testing/researchtesting).

To locate a healthcare provider, see How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.

Where can I find additional information about leukocyte adhesion deficiency type 1?

You may find the following resources about leukocyte adhesion deficiency type 1 helpful. These materials are written for the general public.

You may also be interested in these resources, which are designed for healthcare professionals and researchers.

What other names do people use for leukocyte adhesion deficiency type 1?

  • LAD1
  • leucocyte adhesion deficiency type 1
  • leukocyte adhesion molecule deficiency type 1

For more information about naming genetic conditions, see the Genetics Home Reference Condition Naming Guidelines (http://ghr.nlm.nih.gov/ConditionNameGuide) and How are genetic conditions and genes named? (http://ghr.nlm.nih.gov/handbook/mutationsanddisorders/naming) in the Handbook.

What if I still have specific questions about leukocyte adhesion deficiency type 1?

Ask the Genetic and Rare Diseases Information Center (http://rarediseases.info.nih.gov/GARD/).

What glossary definitions help with understanding leukocyte adhesion deficiency type 1?

adhesion molecule ; autosomal ; autosomal recessive ; bacteria ; cell ; deficiency ; gene ; gums ; immune response ; immune system ; immunodeficiency ; infection ; inflammation ; inherited ; injury ; integrins ; leukocyte ; linkage ; molecule ; mucous ; recessive ; subunit ; syndrome ; tissue ; white blood cells

You may find definitions for these and many other terms in the Genetics Home Reference Glossary (http://www.ghr.nlm.nih.gov/glossary).

References

  • Cox DP, Weathers DR. Leukocyte adhesion deficiency type 1: an important consideration in the clinical differential diagnosis of prepubertal periodontitis. A case report and review of the literature. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Jan;105(1):86-90. Epub 2007 Jul 6. Review. (http://www.ncbi.nlm.nih.gov/pubmed/17618138?dopt=Abstract)
  • Hanna S, Etzioni A. Leukocyte adhesion deficiencies. Ann N Y Acad Sci. 2012 Feb;1250:50-5. doi: 10.1111/j.1749-6632.2011.06389.x. Epub 2012 Jan 25. Review. (http://www.ncbi.nlm.nih.gov/pubmed/22276660?dopt=Abstract)
  • Harris ES, Weyrich AS, Zimmerman GA. Lessons from rare maladies: leukocyte adhesion deficiency syndromes. Curr Opin Hematol. 2013 Jan;20(1):16-25. doi: 10.1097/MOH.0b013e32835a0091. Review. (http://www.ncbi.nlm.nih.gov/pubmed/23207660?dopt=Abstract)
  • Madkaikar M, Currimbhoy Z, Gupta M, Desai M, Rao M. Clinical profile of leukocyte adhesion deficiency type I. Indian Pediatr. 2012 Jan;49(1):43-5. Epub 2011 May 30. (http://www.ncbi.nlm.nih.gov/pubmed/21719937?dopt=Abstract)
  • Nagendran J, Prakash C, Anandakrishna L, Gaviappa D, Ganesh D. Leukocyte adhesion deficiency: a case report and review. J Dent Child (Chic). 2012 May-Aug;79(2):105-10. Review. (http://www.ncbi.nlm.nih.gov/pubmed/22828768?dopt=Abstract)
  • Parvaneh N, Mamishi S, Rezaei A, Rezaei N, Tamizifar B, Parvaneh L, Sherkat R, Ghalehbaghi B, Kashef S, Chavoshzadeh Z, Isaeian A, Ashrafi F, Aghamohammadi A. Characterization of 11 new cases of leukocyte adhesion deficiency type 1 with seven novel mutations in the ITGB2 gene. J Clin Immunol. 2010 Sep;30(5):756-60. doi: 10.1007/s10875-010-9433-2. Epub 2010 Jun 12. (http://www.ncbi.nlm.nih.gov/pubmed/20549317?dopt=Abstract)
  • Schmidt S, Moser M, Sperandio M. The molecular basis of leukocyte recruitment and its deficiencies. Mol Immunol. 2013 Aug;55(1):49-58. doi: 10.1016/j.molimm.2012.11.006. Epub 2012 Dec 17. Review. (http://www.ncbi.nlm.nih.gov/pubmed/23253941?dopt=Abstract)
  • van de Vijver E, Maddalena A, Sanal Ö, Holland SM, Uzel G, Madkaikar M, de Boer M, van Leeuwen K, Köker MY, Parvaneh N, Fischer A, Law SK, Klein N, Tezcan FI, Unal E, Patiroglu T, Belohradsky BH, Schwartz K, Somech R, Kuijpers TW, Roos D. Hematologically important mutations: leukocyte adhesion deficiency (first update). Blood Cells Mol Dis. 2012 Jan 15;48(1):53-61. doi: 10.1016/j.bcmd.2011.10.004. Epub 2011 Nov 30. Review. (http://www.ncbi.nlm.nih.gov/pubmed/22134107?dopt=Abstract)

 

The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? (http://ghr.nlm.nih.gov/handbook/consult/findingprofessional) in the Handbook.

 
Reviewed: April 2014
Published: September 15, 2014