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Mutations in ANKH cause chondrocalcinosis.

Adrian Pendleton¹, Michelle D Johnson, Anne Hughes

¹Department of Medical Genetics, The Queen's University of Belfast, United Kingdom.

American Journal of Human Genetics

|September 26, 2002

Summary

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Mutations in the progressive ankylosis gene (ANKH) are identified as a cause of chondrocalcinosis (CC), a joint disease. These ANKH gene changes lead to increased activity, potentially explaining crystal deposition and offering a therapeutic target for CC.

Area of Science:

Genetics
Molecular Biology
Rheumatology

Background:

Chondrocalcinosis (CC) is a common cause of joint pain and arthritis.
Familial forms of CC (CCAL1, CCAL2) have been linked to specific human chromosomes.
The gene responsible for CCAL2 remained largely unknown.

Purpose of the Study:

To investigate the genetic basis of rare familial forms of chondrocalcinosis (CCAL2).
To identify mutations in the progressive ankylosis gene (ANKH) associated with CC.
To understand the functional impact of ANKH mutations on pyrophosphate levels and crystal deposition.

Main Methods:

Genetic analysis of families with CCAL2 to identify mutations in the ANKH gene.
Functional studies of ANKH mutations in cultured cells to assess pyrophosphate regulation.

Related Experiment Videos

Comparison of human ANKH mutations with a known mouse mutation affecting joint health.

Main Results:

Two families with CCAL2 exhibited mutations in the human ANKH gene.
One sporadic CC patient and their sister showed an ANKH gene deletion.
All identified human ANKH mutations increased gene activity compared to a known mouse mutation, affecting pyrophosphate levels.

Conclusions:

Sequence variations in the ANKH gene are a cause of chondrocalcinosis and joint disease in humans.
Increased ANK activity may underlie the diverse crystal deposition patterns observed in CCAL2.
ANKH presents a potential pharmacological target for treating certain forms of human CC.