The invention particularly relates to a primer probe and a kit for detecting the copy number of a GJB2
gene of a non-syndromic deafness patient by using microdroplet digital PCR (
Polymerase Chain Reaction), and application of the primer probe and the kit. The primer probe combination provided by the invention comprises a
target gene detection primer pair, a
target gene detection probe, an upstream primer of a
reference gene, a downstream primer of the
reference gene and a probe of the
reference gene, and the sequence information of the primer probe combination is shown as SEQ ID NO.6-11; the invention also provides a kit for detecting the copy number of the GJB2
gene of a non-syndromic deafness patient. When the primer probe combination and the kit provided by the invention are applied to detection of
copy number variation of the GJB2
gene of a patient with non-syndromic deafness, the accuracy of
hereditary deafness detection is remarkably improved; whether GJB2
gene expression is abnormal or not is judged in an auxiliary mode according to the judgment result,
disease prognosis is evaluated, potential treatment drugs are screened,
genetic counseling services are provided or personalized medical schemes are formulated, and the method has wide application prospects.