New Mutation Linked to Usher Syndrome in a Portuguese Family
Author Information
Author(s): Audo Isabelle, Bujakowska Kinga, Mohand-Saïd Saddek, Tronche Sophie, Lancelot Marie-Elise, Antonio Aline, Germain Aurore, Lonjou Christine, Carpentier Wassila, Sahel José-Alain, Bhattacharya Shomi, Zeitz Christina
Primary Institution: INSERM, U968, Paris, France
Hypothesis
To identify the genetic defect of a consanguineous Portuguese family with rod-cone dystrophy and varying degrees of decreased audition.
Conclusion
A novel truncating mutation in DFNB31 is associated with severe rod-cone dystrophy and varying degrees of hearing impairment in a consanguineous family of Portuguese origin.
Supporting Evidence
- The largest homozygous region mapped to chromosome 9, which contains the DFNB31 gene.
- A novel one-base-pair deletion in DFNB31 was identified in the index patient.
- The mutation co-segregated with the disease in the family.
- Severe rod-cone dystrophy was observed in the index patient and affected siblings.
- Moderate hearing loss was reported in the index patient, with more profound loss in siblings.
Takeaway
Scientists found a new genetic change in a family that causes both vision and hearing problems. This change affects how their eyes and ears work together.
Methodology
The study involved genetic testing, including homozygosity mapping and Sanger sequencing, on family members with rod-cone dystrophy and hearing loss.
Limitations
The study could not examine all affected siblings directly, relying on physician reports for their conditions.
Participant Demographics
The index patient was a 60-year-old female from a consanguineous Portuguese family.
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