Expanded carrier screening for preconception reproductive risk assessment: Prevalence of carrier status in a Mexican population

Objective Genetic carrier screening has the potential to identify couples at risk of having a child affected with an autosomal recessive or X‐linked disorder. However, the current prevalence of carrier status for these conditions in developing countries is not well defined. This study assesses the p...

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Bibliographic Details
Published in:Prenatal diagnosis 2020-04, Vol.40 (5), p.635-643
Main Authors: Hernandez‐Nieto, Carlos, Alkon‐Meadows, Tamar, Lee, Joseph, Cacchione, Teresa, Iyune‐Cojab, Esther, Garza‐Galvan, Maria, Luna‐Rojas, Martha, Copperman, Alan B, Sandler, Benjamin
Format: Article
Language:English
Subjects:
Biotinidase
Current carriers
Cystic fibrosis
Developing countries
Familial Mediterranean fever
Genetic counseling
Genetic screening
Hearing loss
Hereditary diseases
Infertility
LDCs
Medical treatment
Minority & ethnic groups
Patients
Population genetics
Risk assessment
Thalassemia
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Summary:Objective Genetic carrier screening has the potential to identify couples at risk of having a child affected with an autosomal recessive or X‐linked disorder. However, the current prevalence of carrier status for these conditions in developing countries is not well defined. This study assesses the prevalence of carrier status of selected genetic conditions utilizing an expanded, pan‐ethnic genetic carrier screening panel (ECS) in a large population of Mexican patients. Methods Retrospective chart review of all patients tested with a single ECS panel at an international infertility center from 2012 to 2018 were included, and the prevalence of positive carrier status in a Mexican population was evaluated. Results Eight hundred five individuals were analyzed with ECS testing for 283 genetic conditions. Three hundred fifty‐two carriers (43.7%) were identified with 503 pathogenic variants in 145 different genes. Seventeen of the 391 participating couples (4.34%) were identified as being at‐risk couples. The most prevalent alleles found were associated with alpha thalassemia, cystic fibrosis, GJB2 nonsyndromic hearing loss, biotinidase deficiency, and familial Mediterranean fever. Conclusion Based on the prevalence and severity of Mendelian disorders, we recommend that couples who wish to conceive regardless of their ethnicity background explore carrier screening and genetic counseling prior to reproductive medical treatment.
ISSN:0197-3851
1097-0223
DOI:10.1002/pd.5656