ClinVar Miner

Submissions for variant NM_000742.4(CHRNA2):c.1037C>A (p.Thr346Asn)

gnomAD frequency: 0.00002  dbSNP: rs767656036
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Total submissions: 1
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Invitae RCV000792378 SCV000931673 uncertain significance Autosomal dominant nocturnal frontal lobe epilepsy 2023-12-11 criteria provided, single submitter clinical testing This sequence change replaces threonine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 346 of the CHRNA2 protein (p.Thr346Asn). This variant is present in population databases (rs767656036, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with CHRNA2-related conditions. This missense change has been observed in at least one individual who was not affected with CHRNA2-related conditions (Invitae). ClinVar contains an entry for this variant (Variation ID: 639557). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt CHRNA2 protein function with a positive predictive value of 80%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.

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