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Results of standard genetic diagnostics remain inconclusive in 3%\u201320% of WD patients in part due to problematic assessment of variants of unknown or conflicting pathogenicity (synonymous variants included). Correct interpretation of potential effects of such variants can be substantially enhanced by RNA analyses. This strategy is, however, of limited utility in WD patients because of predominant liver expression of\n                    <jats:italic>ATP7B<\/jats:italic>\n                    . To avoid invasive bioptic liver collection and increase WD diagnostic yields, we searched for a surrogate tissue sample and identified profiles of\n                    <jats:italic>ATP7B<\/jats:italic>\n                    transcripts in nasopharyngeal swabs that were comparable to liver. Amplicons spanning\n                    <jats:italic>ATP7B<\/jats:italic>\n                    Exons 3\u201321 were prepared from the swab material and analysed by long\u2010read nanopore sequencing to enable the detection of splicing changes and variant phasing. Diagnostic utility of this novel\n                    <jats:italic>in vivo<\/jats:italic>\n                    methodology was demonstrated by characterization of mRNA splicing abnormalities caused by synonymous\n                    <jats:italic>ATP7B<\/jats:italic>\n                    variants c.1488C&gt;T (p.(Gly496=)), c.2241C&gt;T (p.(Ile747=)), c.2292C&gt;T (p.(Phe764=)), and a nonsense variant c.2336G&gt;A (p.(Trp779Ter)) in four WD patients, who were not genetically resolved by standard techniques. Nasopharyngeal swab sampling is minimally invasive and allows effective analyses of mRNA to detect and\/or validate effects of\n                    <jats:italic>ATP7B<\/jats:italic>\n                    variants in WD patients. Conclusive genetic diagnosis attained by this novel technique may facilitate family counselling and substantiate initiation of copper\u2010chelation therapy in presymptomatic individuals.\n                  <\/jats:p>","DOI":"10.1155\/humu\/8416660","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T13:43:19Z","timestamp":1772977399000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Analyses of\n                    <i>ATP7B<\/i>\n                    mRNA in Nasopharyngeal Swab Samples Increase Yields of Wilson Disease Molecular Genetic Diagnostics"],"prefix":"10.1155","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4347-7768","authenticated-orcid":false,"given":"Lenka","family":"Steiner 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