Chromothriptic cure of WHIM syndrome

Area of Science:

• Genetics
• Immunology
• Cell Biology

Background:

• WHIM syndrome is an immunodeficiency caused by a CXCR4 gain-of-function mutation.
• Chromothripsis involves massive chromosome deletion and rearrangement.

Observation:

• A patient with WHIM syndrome experienced spontaneous cure.
• Chromothripsis deleted the CXCR4(R334X) allele and 163 other genes in a hematopoietic stem cell.
• This HSC repopulated the myeloid lineage but not the lymphoid lineage.

Findings:

• The deletion resulted in Cxcr4 haploinsufficiency.
• Cxcr4 haploinsufficiency conferred a long-term engraftment advantage in mouse bone marrow transplantation models.
• This advantage was observed over wild-type and WHIM syndrome model mice.

Implications:

• Spontaneous chromothripsis offers a potential cure for WHIM syndrome.
• Partial CXCR4 inactivation may be a therapeutic strategy for hematopoietic stem cell transplantation.
• This approach could enhance donor cell engraftment.