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EDITORIAL article

Front. Genet.

Sec. Genetics of Common and Rare Diseases

Volume 16 - 2025 | doi: 10.3389/fgene.2025.1675361

This article is part of the Research TopicRare Diseases Research and Diagnosis in Low- and Middle-Income CountriesView all 37 articles

Editorial: Rare Diseases Research and Diagnosis in Low-and Middle-Income Countries

Provisionally accepted
  • 1International Laboratory for Human Genome Research, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico
  • 2Universitat de Barcelona, Barcelona, Spain
  • 3University of Colombo, Colombo, Sri Lanka

The final, formatted version of the article will be published soon.

component, and more than 6,000 conditions have been linked to a known molecular cause. In the last 15 years, the adoption of human genomic sequencing has enabled the more efficient and accurate diagnosis and research of rare genetic disorders. Genomic sequencing has become a first-tier diagnostic test for many patients with congenital syndromes and suspected genetic disorders in high-income countries, as well as an effective method for the study of undiagnosed and novel genetic disorders in the research arena. The implementation of massive parallel sequencing technologies, in the form of candidate gene panels, exome, or whole genome sequencing, has dramatically changed the diagnosis and research of rare diseases in high-income countries. In contrast, the reality in low-and middle-income countries (LMICs) is strikingly different, where disparities in access to these technologies exist. The high cost of genomic sequencing and other genetic analysis technologies remains a limiting factor for the implementation of these methods for diagnosis and research of rare diseases in resource limited settings.The study of rare genetic diseases in LMICs remains significantly underrepresented compared to large-scale genomic studies conducted in high-income countries. Despite some being carried out under resource-constrained conditions, these efforts often receive limited visibility in the scientific literature. As a result, there is a disproportionate lack of data from LMICs, which restricts the global understanding of the genetic and phenotypic Other reviews included in this Special Topic cover the advantages and challenges of incorporating CNV analyses from exome data to improve the yield of exome sequencing in resource-constrained settings (Louw et al.) where the availability and affordability of whole genome sequencing is still lagging. Additionally, Giugliani and colleagues review the current landscape and challenges of newborn screening programs in Latin America.Despite demonstrated to be a highly-effective public health strategy, newborn screening is still not broadly implemented in Latin America and other LMICs in the world. Early and accurate detection of rare diseases is fundamental to reduce mortality and morbidity associated with RDs and ensure quality of life for patients.In summary, the wide variety of papers published as part of this Special Topic highlight that even in resource constrained settings, molecular genetic testing, including genomic sequencing, for rare disorders is extremely valuable for diagnosis, research, management and counseling of patients and families living with RDs. Efforts should continue and increase to make these technologies more broadly available and affordable to be successfully implemented in LMICs. This collection adds to the rapidly expanding knowledge coming from historically underrepresented populations and countries and should be welcomed by all those in the field who wish to see genetic and genomic data from global populations represented in international genomic databases.

Keywords: Rare Diseases, Genetics, Genomics, Low and Middle Income Countries, Molecular diagnostics, NGS - next generation sequencing, Equity, Research

Received: 29 Jul 2025; Accepted: 01 Aug 2025.

Copyright: © 2025 Gonzaga-Jauregui, Casals and Dissanayake. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Claudia Gonzaga-Jauregui, International Laboratory for Human Genome Research, Universidad Nacional Autónoma de México, Juriquilla, Querétaro, Mexico

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