Heterozygous germline TET2 loss-of-function variants associated with an ALPS-like phenotype

Area of Science:

• Genetics
• Immunology
• Oncology

Background:

• Germline homozygous loss-of-function mutations in TET2 cause childhood immunodeficiency resembling autoimmune lymphoproliferative syndrome (ALPS) and increase lymphoma risk.
• The clinical significance of heterozygous TET2 variants remains less understood.

Purpose of the Study:

• To investigate the association between heterozygous germline TET2 mutations and clinical phenotypes.
• To expand the understanding of TET2's role in lymphoproliferative and autoimmune disorders.

Main Methods:

• Case study of four patients with heterozygous germline loss-of-function TET2 mutations.
• Clinical and genetic analysis of patient presentations.

Main Results:

• Four patients with heterozygous germline TET2 mutations presented with B-cell lymphoma.
• These patients also exhibited chronic lymphadenopathy and autoimmune features.
• This study links heterozygous TET2 mutations to lymphoma and an ALPS-like phenotype.

Conclusions:

• Germline heterozygous loss-of-function TET2 mutations are associated with B-cell lymphoma and an ALPS-like phenotype.
• Consideration of TET2 mutation assessment in patients with relevant clinical histories is warranted.
• Identifying these variants has implications for patient management and diagnosis.