You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Background Sensorineural hearing loss ( SNHL ) is a clinically and genetically heterogeneous disease . In some populations , c .365delG mutation in the _GJB2_ gene represents the most frequent cause of hereditary SNHL . The great diversity of mutations in the _GJB2_ gene worldwide highlights the participation of ethnic background in SNHL . Objective To describe the presence of homozygous c .del35G mutation in the _GJB2_ gene in a Mexican family with SNHL . Materials and methods A Mexican family with SNHL was included in the study . Analysis of the _GJB2_ gene was performed through whole exome sequencing ( WES ) and DNA direct sequencing analysis in all members of the family and in 100 normal controls . Results Affected sibs showed the homozygous c .del35G mutation in the _GJB2_ gene . Parents of the families were heterozygous for the molecular defect and had normal audition . Conclusion We describe a homozygous c .del35G mutation in the _GJB2_ gene through WES analysis , a homozygous mutation with a very low occurrence in Mexican population .
Sensorineural hearing loss
SNHL
hereditary SNHL
SNHL
SNHL
SNHL