Mutations in ERGIC1 cause Arthrogryposis multiplex congenita, neuropathic type

Area of Science:

• Genetics
• Molecular Biology
• Neurology

Background:

• Arthrogryposis multiplex congenita (AMC) is a diverse group of disorders characterized by congenital joint contractures.
• The etiology of most AMC types remains largely unknown, necessitating further genetic investigation.

Purpose of the Study:

• To identify the genetic cause of neuropathic AMC in a large Israeli Arab kindred.
• To investigate the role of protein trafficking in AMC pathogenesis.

Main Methods:

• Whole exome sequencing was performed on affected individuals.
• Genetic linkage analysis was used to narrow down the chromosomal region.
• Variant pathogenicity was assessed and tested for absence in control populations.

Main Results:

• A homozygous pathogenic variant in the ERGIC1 gene was identified within the previously mapped locus on chromosome 5qter.
• The identified ERGIC1 mutation was absent in over 200 healthy individuals from the Israeli Arab population.
• ERGIC1 encodes a protein involved in intracellular transport between the endoplasmic reticulum and Golgi apparatus.

Conclusions:

• The study identifies a novel genetic cause for hereditary AMC linked to the ERGIC1 gene.
• These findings suggest that disruptions in protein trafficking pathways may contribute to the development of AMC.
• This expands the known genetic spectrum of arthrogryposis multiplex congenita.