X-Linked lymphoproliferative disease 2


XLP 1 and XLP 2 are X-linked immunodeficiencies characterised by extreme sensitivity to the Epstein Barr virus (EBV). Affected individuals can be diagnosed on the basis of an abnormality or deficiency of the SLAM associated protein (SAP) or XIAP protein. The XIAP gene has 7 exons (6 coding) and family specific mutations are found throughout the gene.

Also known as

XLP2, XIAP deficiency, X-linked inhibitor of apoptosis, Baculoviral IAP repeat-containing protein 4 (BIRC4), Apoptosis inhibitor 3 (API3), IAP-like protein (ILP), Mammalian IAP homolog A (MIHA)

Request a test

When requesting this test please use the referral form provided. Please also refer to any additional information provided for this test. Download the referral form >

Additional information

The guidelines for the NCG service for immunodeficiencies apply to the molecular analysis of XLP (details on request). Affected patients should be referred to the Molecular Immunology laboratory at GOSH for XIAP protein analysis. This requires prior arrangement and completion of specific request forms (contact Dr Kimberly Gilmour in Molecular Immunology, GOSH � Tel: +44 (0) 20 7829 8835, Email: Kimberly.Gilmour@gosh.nhs.uk). We work closely with this department and will undertake mutation screening in appropriate patients. Download additional information >

Sending address

Great Ormond Street Hospital NE Thames Regional Genetics Service Laboratories
Great Ormond Street Hospital for Children
Barclay House
37 Queen Square

Laboratory service


Sample requirements

1ml EDTA neonates, 5ml EDTA adults

Reference range

Not applicable

Turnaround time

40 days

Disease / group



Upon request

Call in advance?

Prenatals must be arranged in advance, through a Clinical Genetics department if possible. Amniotic fluid or CV samples should be sent to Cytogenetics for dissecting and culturing, with instructions to forward the sample to the Regional Molecular Genetics laboratory for analysis


The Genetics Laboratories provide an extensive range of Cytogenetics and Molecular Genetics diagnostic testing services...

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