However, studies to date have not identified a causative gene.

As such they are no longer considered to be causative genes.

Recently, one of the genetic causes was identified; however, there are probably other causative genes that exist that have not yet been found.

As EA3 is extremely rare, there is currently no known causative gene.

There are also 300 syndromes with related hearing loss, and each syndrome may have causative genes.

The causative gene on the short arm of chromosome 16 has been cloned.

Despite identification of six causative genes, the diagnosis of Noonan syndrome is still based on clinical features.

There are two known mutations in this gene causative for SCA13.

There are a number of possible genetic loci for this disorder, though no causative genes have been demonstrated.

They were the first to localize one of the major causative genes to a specific chromosomal locus through linkage studies.