Submitted Successfully!
To reward your contribution, here is a gift for you: A free trial for our video production service.
Thank you for your contribution! You can also upload a video entry or images related to this topic.
Version Summary Created by Modification Content Size Created at Operation
1 + 566 word(s) 566 2020-12-15 07:29:42

Video Upload Options

Do you have a full video?


Are you sure to Delete?
If you have any further questions, please contact Encyclopedia Editorial Office.
Xu, C. Leukocyte Adhesion Deficiency Type 1. Encyclopedia. Available online: (accessed on 17 June 2024).
Xu C. Leukocyte Adhesion Deficiency Type 1. Encyclopedia. Available at: Accessed June 17, 2024.
Xu, Camila. "Leukocyte Adhesion Deficiency Type 1" Encyclopedia, (accessed June 17, 2024).
Xu, C. (2020, December 24). Leukocyte Adhesion Deficiency Type 1. In Encyclopedia.
Xu, Camila. "Leukocyte Adhesion Deficiency Type 1." Encyclopedia. Web. 24 December, 2020.
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.

genetic conditions

1. Introduction

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.

2. Frequency

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.

3. Causes

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.

4. Inheritance

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.

5. Other Names for This Condition

  • LAD1

  • leucocyte adhesion deficiency type 1

  • leukocyte adhesion molecule deficiency type 1


  1. Cox DP, Weathers DR. Leukocyte adhesion deficiency type 1: an importantconsideration in the clinical differential diagnosis of prepubertalperiodontitis. A case report and review of the literature. Oral Surg Oral MedOral Pathol Oral Radiol Endod. 2008 Jan;105(1):86-90.
  2. Hanna S, Etzioni A. Leukocyte adhesion deficiencies. Ann N Y Acad Sci. 2012Feb;1250:50-5. doi: 10.1111/j.1749-6632.2011.06389.x.
  3. Harris ES, Weyrich AS, Zimmerman GA. Lessons from rare maladies: leukocyteadhesion deficiency syndromes. Curr Opin Hematol. 2013 Jan;20(1):16-25. doi:10.1097/MOH.0b013e32835a0091. Review.
  4. Madkaikar M, Currimbhoy Z, Gupta M, Desai M, Rao M. Clinical profile ofleukocyte adhesion deficiency type I. Indian Pediatr. 2012 Jan;49(1):43-5.
  5. Nagendran J, Prakash C, Anandakrishna L, Gaviappa D, Ganesh D. Leukocyteadhesion deficiency: a case report and review. J Dent Child (Chic). 2012May-Aug;79(2):105-10. Review.
  6. 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 withseven novel mutations in the ITGB2 gene. J Clin Immunol. 2010 Sep;30(5):756-60.doi: 10.1007/s10875-010-9433-2.
  7. 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.
  8. van de Vijver E, Maddalena A, Sanal Ö, Holland SM, Uzel G, Madkaikar M, deBoer M, van Leeuwen K, Köker MY, Parvaneh N, Fischer A, Law SK, Klein N, TezcanFI, Unal E, Patiroglu T, Belohradsky BH, Schwartz K, Somech R, Kuijpers TW, Roos D. Hematologically important mutations: leukocyte adhesion deficiency (firstupdate). Blood Cells Mol Dis. 2012 Jan 15;48(1):53-61. doi:10.1016/j.bcmd.2011.10.004.
Contributor MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to :
View Times: 309
Entry Collection: MedlinePlus
Revision: 1 time (View History)
Update Date: 24 Dec 2020
Video Production Service