Cited by 85Liver Disease Diagnosis and TreatmentGenetic Associations and EpidemiologyLiver Diseases and Immunity

Emerging role of genomic analysis in clinical evaluation of lean individuals with NAFLD

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Vilarinho, Sílvia, Ajmera, Veeral, Zheng, Melanie, Loomba, Rohit·2021·Hepatology

Abstract

Whereas the rising prevalence of nonalcoholic fatty liver disease (NAFLD) is closely related with the global obesity epidemic, up to 10–20% of individuals with NAFLD are lean as defined by a body mass index of < 25 kg/m(2), or < 23 kg/m(2) in Asians. This entity designated as “lean NAFLD” is estimated to affect 8 to 10 million individuals in the United States alone. Here, we review the emerging data on the epidemiology, natural history and prognosis of lean NAFLD and put forward a diagnostic approach that combines detailed clinical phenotyping with genomic analysis. We propose two subtypes of lean NAFLD referred to as type 1: individuals with visceral adiposity and insulin resistance but normal BMI; and type 2: lean individuals with hepatic steatosis secondary to a known or unknown monogenic disease. We envision that incorporation of genomic analysis in the diagnostic algorithm of lean patients with NAFLD will elucidate the contribution of common genetic variants through the calculation of NAFLD polygenic risk score and also characterize the diverse array of rare monogenic diseases that can lead to triglyceride accumulation in the cytoplasm of hepatocytes. Collectively, the integration of a molecular diagnosis in the clinical evaluation of patients with lean NAFLD will provide an accurate diagnosis, with possible targeted therapies and may uncover novel molecular mechanisms with potential broader therapeutic implications.

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Crossref · 10.1002/hep.32047

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  • Initial data suggest that individuals with strong family history, early disease onset, or lack of accruing factors may benefit from a comprehensive genetic evaluation that may identify strong genetic determinants of SLD with potential implications for treatment and family counselling.

    “Initial data suggest that individuals with a) strong family history, b) early disease onset, or c) lack of accruing factors may bene fi t from a comprehensive genetic evaluation ( e.g. whole-exome sequencing or targeted panel sequencing) that may identify strong genetic determinants of SLD with potential implications for treatment and family counselling. 135,208 -211”

    From EASL-EASD-EASO Clinical Practice Guidelines on the management of metabolic dysfunction-associated steatotic liver disease (MASLD). (2024) · cites this paper as [208]

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  • Using next generation sequencing, a refined diagnosis such as monogenic SLD can currently be reached in up to one-third of individuals.

    “Using next generation sequencing (NGS), a re fi ned diagnosis ( e.g. monogenic SLD) can currently be reached in up to onethird of individuals. 208,210,212”

    From EASL-EASD-EASO Clinical Practice Guidelines on the management of metabolic dysfunction-associated steatotic liver disease (MASLD). (2024) · cites this paper as [208]

    The Introduction and “Rare Genetic Variants and Type 2 Lean NAFLD” section say that genomic analysis can uncover monogenic disorders and provide a more precise diagnosis in selected lean patients with NAFLD. They do not report a diagnostic yield of up to one-third of individuals, and the paper presents broader genomic diagnosis as a proposed approach rather than an established yield across individuals. (LLM, conf=0.86)

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Authors
Vilarinho, S., Ajmera, V., Zheng, M., & Loomba, R.
Affiliations
  • Yale University (US)
  • University of California San Diego (US)
Corresponding author
  • Vilarinho, Sílvia
  • Loomba, Rohit
Venue
Hepatology
Published
2021-09-24
Volume
74
Issue
4
Pages
2241-2250
ISSN
  • 0270-9139 (ISSN-L)
  • 1527-3350
OpenAlex
W3180256479
Cited by
85
References
84
Citations by year
2026: 8 · 2025: 13 · 2024: 21 · 2023: 24 · 2022: 18 · 2021: 1
FWCI
2.44
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institutes of Health (UL1TR001442)
  • National Institute on Alcohol Abuse and Alcoholism (U01AA029019)
  • National Heart, Lung, and Blood Institute (P01HL147835)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K08DK113109, R01DK124318, K23DK119460, R01DK121378, R01DK106419, K23DK090303, P30DK120515, U01DK061734)
  • National Institute of Environmental Health Sciences (P42ES010337)
  • National Center for Advancing Translational Sciences
Topics
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
Keywords
lean NAFLD, non-alcoholic fatty liver disease, genetic variants, rare monogenic diseases, hepatic steatosis, visceral fat, insulin resistance, triglyceride accumulation, molecular diagnosis, clinical phenotyping
MeSH terms
Genomic Medicine, Humans, Thinness, Genomics, Non-alcoholic Fatty Liver Disease

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