Targeted long-read sequencing for comprehensive detection of CYP21A2 mutations in patients with 21-hydroxylase deficiency.

Autor: Zhang X; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Gao Y; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Lu L; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Cao Y; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Zhang W; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Sun B; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Wu X; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Tong A; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Chen S; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Wang X; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Mao J; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China., Nie M; Department of Endocrinology, Key Laboratory of Endocrinology, National Health Commission (NHC), Peking Union Medical College Hospital), Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China. nm_pumch@aliyun.com.; State Key Laboratory of Complex, Severe and Rare Diseases, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing, China. nm_pumch@aliyun.com.
Jazyk: angličtina
Zdroj: Journal of endocrinological investigation [J Endocrinol Invest] 2024 Apr; Vol. 47 (4), pp. 833-841. Date of Electronic Publication: 2023 Oct 10.
DOI: 10.1007/s40618-023-02197-y
Abstrakt: Background: 21-Hydroxylase deficiency (21-OHD) is caused by pathogenic CYP21A2 variations. CYP21A2 is arranged in tandem with its highly homologous pseudogene CYP21A1P; therefore, it is prone to mismatch and rearrangement, producing different types of complex variations. There were few reports on using only one method to detect different CYP21A2 variants simultaneously.
Aims: Targeted long-read sequencing method was used to detect all types of CYP21A2 variants in a series of patients with 21-OHD.
Methods: A total of 59 patients with 21-OHD were enrolled from Peking Union Medical College Hospital. Long-range locus-specific PCR and long-read sequencing (LRS) were performed to detect the pathogenic variants in CYP21A2.
Results: Copy-number variants of CYP21A2 were found in 25.4% of patients, including 5.1% with 3 copies of CYP21A2, 16.9% with 1 copy of CYP21A2, and 3.4% with 0 copy of CYP21A2. The remaining 74.6% of patients had 2 copies of CYP21A2. Pathogenic variants were identified in all 121 alleles of 59 patients. Specifically, single-nucleotide variants and small insertions/deletions (< 50 bp) were detected in 79 alleles, of which conversed from CYP21A1P were detected in 63 alleles, and rare variants were found in the other 16 alleles. Large gene conversions (> 50 bp) from pseudogene were detected in 10 alleles, and different chimeric genes (CYP21A1P/CYP21A2 or TNXA/TNXB) formed by large deletions were detected in 32 alleles. Of all variants, p.I173N was the most common variant (19.0%).
Conclusions: Our study demonstrated that targeted long-read sequencing is a comprehensive method for detecting CYP21A2 variations, which is helpful for genetic diagnosis in 21-OHD patients.
(© 2023. The Author(s), under exclusive licence to Italian Society of Endocrinology (SIE).)
Databáze: MEDLINE
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