Selective IgM Deficiency: Evidence, Controversies, and Gaps.

Area of Science:

• Immunology
• Genetics
• Pediatrics

Background:

• Selective Immunoglobulin M deficiency (SIgMD) is a primary immunodeficiency recently classified by the International Union of Immunological Societies.
• Understanding of SIgMD, particularly in pediatric cases, remains limited, with unknown epidemiology and elusive pathogenesis.
• Clinical manifestations in children primarily include recurrent respiratory infections, alongside allergic and autoimmune conditions.

Purpose of the Study:

• To highlight the limited understanding of SIgMD in the pediatric population.
• To underscore the need for research into the epidemiology, pathogenesis, and genetic basis of SIgMD.
• To review current therapeutic approaches and identify gaps in knowledge regarding management and prognosis.

Main Methods:

• Literature review on SIgMD in pediatric populations.
• Analysis of clinical manifestations and current treatment strategies.
• Identification of knowledge gaps requiring further investigation.

Main Results:

• The epidemiology and genetic basis of SIgMD are largely unknown.
• Recurrent respiratory infections are the predominant clinical feature in children.
• Conclusive data on optimal therapeutic management and long-term prognosis are lacking.

Conclusions:

• Further studies are essential to elucidate the molecular mechanisms and genetic underpinnings of SIgMD.
• Improved understanding is needed for accurate clinical, immunological, and prognostic characterization.
• Development of tailored therapeutic strategies for SIgMD is a critical future direction.