PMID- 38397196 OWN - NLM STAT- MEDLINE DCOM- 20240226 LR - 20240227 IS - 2073-4425 (Electronic) IS - 2073-4425 (Linking) VI - 15 IP - 2 DP - 2024 Feb 5 TI - Immunogenetic Aspects of Sarcopenic Obesity. LID - 10.3390/genes15020206 [doi] LID - 206 AB - Sarcopenic obesity (SO) is a combination of obesity and sarcopenia, with diagnostic criteria defined as impaired skeletal muscle function and altered body composition (e.g., increased fat mass and reduced muscle mass). The mechanism of SO is not yet perfectly understood; however, the pathogenesis includes aging and its complications, chronic inflammation, insulin resistance (IR), and hormonal changes. Genetic background is apparent in the pathogenesis of isolated obesity, which is most often polygenic and is characterized by the additive effect of various genetic factors. The genetic etiology has not been strictly established in SO. Still, many data confirm the existence of pathogenic gene variants, e.g., Fat Mass and Obesity Associated Gene (FTO), beta-2-adrenergic receptor (ADRB2) gene, melanocortin-4 receptor (MC4R) and others with obesity. The literature on the role of these genes is scarce, and their role has not yet been thoroughly established. On the other hand, the involvement of systemic inflammation due to increased adipose tissue in SO plays a significant role in its pathophysiology through the synthesis of various cytokines such as monocyte chemoattractant protein-1 (MCP-1), IL-1Ra, IL-15, adiponectin or CRP. The lack of anti-inflammatory cytokine (e.g., IL-15) can increase SO risk, but further studies are needed to evaluate the exact mechanisms of implications of various cytokines in SO individuals. This manuscript analyses various immunogenetic and non-genetic factors and summarizes the recent findings on immunogenetics potentially impacting SO development. FAU - Mazurkiewicz, Lukasz AU - Mazurkiewicz L AUID- ORCID: 0000-0001-8104-8679 AD - Department of Rheumatology, Rehabilitation and Internal Diseases, Poznan University of Medical Sciences, 61-701 Poznan, Poland. FAU - Czernikiewicz, Krystian AU - Czernikiewicz K AUID- ORCID: 0000-0001-5006-4203 AD - Department of Rheumatology, Rehabilitation and Internal Diseases, Poznan University of Medical Sciences, 61-701 Poznan, Poland. FAU - Grygiel-Gorniak, Bogna AU - Grygiel-Gorniak B AUID- ORCID: 0000-0002-3438-0764 AD - Department of Rheumatology, Rehabilitation and Internal Diseases, Poznan University of Medical Sciences, 61-701 Poznan, Poland. LA - eng PT - Journal Article PT - Review DEP - 20240205 PL - Switzerland TA - Genes (Basel) JT - Genes JID - 101551097 RN - 0 (Interleukin-15) RN - EC 1.14.11.33 (FTO protein, human) RN - EC 1.14.11.33 (Alpha-Ketoglutarate-Dependent Dioxygenase FTO) SB - IM MH - Humans MH - *Sarcopenia/genetics/complications/diagnosis MH - Immunogenetics MH - Interleukin-15 MH - Obesity/genetics/pathology MH - Inflammation/genetics/complications MH - Alpha-Ketoglutarate-Dependent Dioxygenase FTO PMC - PMC10888391 OTO - NOTNLM OT - genetic background OT - immunogenetics aspects OT - sarcopenic obesity COIS- The authors declare no conflicts of interest. EDAT- 2024/02/24 11:44 MHDA- 2024/02/26 06:45 PMCR- 2024/02/05 CRDT- 2024/02/24 01:05 PHST- 2024/01/02 00:00 [received] PHST- 2024/01/28 00:00 [revised] PHST- 2024/02/01 00:00 [accepted] PHST- 2024/02/26 06:45 [medline] PHST- 2024/02/24 11:44 [pubmed] PHST- 2024/02/24 01:05 [entrez] PHST- 2024/02/05 00:00 [pmc-release] AID - genes15020206 [pii] AID - genes-15-00206 [pii] AID - 10.3390/genes15020206 [doi] PST - epublish SO - Genes (Basel). 2024 Feb 5;15(2):206. doi: 10.3390/genes15020206.