Results of a Diagnostic Procedure Based on Multiplex Technology on Dried Blood Spots and Buccal Swabs for Subjects With Suspected Alpha1 Antitrypsin Deficiency.

Abstract:

INTRODUCTION:The objective of this analysis was the evaluation of a new national circuit used for diagnosing alpha1 antitrypsin deficiency (AATD) based on multiplex technology using online registration and mail posted samples from dried blood spots (DBS) and buccal swabs. METHODS:This is an observational, ongoing study conducted in Spain since March 2018. Samples are coded on a web platform and sent by postal mail to the central laboratory. Allele-specific genotyping for the 14 most common mutations was done with the Luminex 200 Instrument System. Gene sequencing was done if none of the mutations were found and the AAT serum level was <60mg/dl, or by request from the clinician in charge. RESULTS:At the time of the present report, 5803 (92.9%) samples were processed, 4984 (85.9%) from buccal swab and 819 (14.1%) from DBS. The prevalence of the frequent allele combinations were: MS 19.0%, MZ 14.4%, SS 2.9%, SZ 3.7%, and ZZ: 1.4%. Globally, Z carriers represented 20.0% and S carriers 26.6% of this population, with differences seen between regions. 209 (3.6%) were identified carrying rare alleles, 12 (0.2%) carrying null alleles and 14 (0.3%) new mutations were described. Respiratory diseases other than COPD, including poorly controlled asthma or bronchiectasis, also presented AATD mutations. CONCLUSIONS:The availability of a diagnostic system based on the simultaneous testing of 14 genetic variants from buccal swabs or DBS sent by postal mail and with web registration has proven to be useful, and the system can improve the timely diagnosis of AATD.

journal_name

Arch Bronconeumol

authors

Lopez-Campos JL,Casas-Maldonado F,Torres-Duran M,Medina-Gonzálvez A,Rodriguez-Fidalgo ML,Carrascosa I,Calle M,Osaba L,Rapun N,Drobnic E,Miravitlles M

doi

10.1016/j.arbres.2020.04.014

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

42-50

issue

1

eissn

0300-2896

issn

1579-2129

pii

S0300-2896(20)30131-9

journal_volume

57

pub_type

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