Cited by 225Muscle Physiology and DisordersGenetics and Physical PerformanceMuscle metabolism and nutrition

Sex-Related Differences in Gene Expression in Human Skeletal Muscle

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Welle, Stephen, Tawil, Rabi, Thornton, Charles A.·2008·PLoS ONE

Abstract

There is sexual dimorphism of skeletal muscle, the most obvious feature being the larger muscle mass of men. The molecular basis for this difference has not been clearly defined. To identify genes that might contribute to the relatively greater muscularity of men, we compared skeletal muscle gene expression profiles of 15 normal men and 15 normal women by using comprehensive oligonucleotide microarrays. Although there were sex-related differences in expression of several hundred genes, very few of the differentially expressed genes have functions that are obvious candidates for explaining the larger muscle mass of men. The men tended to have higher expression of genes encoding mitochondrial proteins, ribosomal proteins, and a few translation initiation factors. The women had >2-fold greater expression than the men (P<0.0001) of two genes that encode proteins in growth factor pathways known to be important in regulating muscle mass: growth factor receptor-bound 10 (GRB10) and activin A receptor IIB (ACVR2B). GRB10 encodes a protein that inhibits insulin-like growth factor-1 (IGF-1) signaling. ACVR2B encodes a myostatin receptor. Quantitative RT-PCR confirmed higher expression of GRB10 and ACVR2B genes in these women. In an independent microarray study of 10 men and 9 women with facioscapulohumeral dystrophy, women had higher expression of GRB10 (2.7-fold, P<0.001) and ACVR2B (1.7-fold, P<0.03). If these sex-related differences in mRNA expression lead to reduced IGF-1 activity and increased myostatin activity, they could contribute to the sex difference in muscle size.

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  • More than 3,000 genes have been identified as differentially expressed between male and female skeletal muscle.

    “Previous studies have identified over 3,000 genes that are differentially expressed in male and female skeletal muscle.”
  • Analysis of mRNA from male and female vastus lateralis biopsies by microarray shows (when normalized to α-actinin) that female muscle has 35% more MyHC-I/β, 30% less MyHC-IIa, and 15% less MyHC-IIx mRNA than corresponding male muscle.

    “Analysis of mRNA from both male and female vastus lateralis biopsies by microarray shows (when normalized to α-actinin) that the female muscle has 35% more MyHC-I/β, 30% less MyHC-IIa, and 15% less MyHC-IIx mRNA than the corresponding male muscle (96).”
  • In the study by Welle et al., two genes upregulated in women compared with men are GRB10 and ACVR2A, which code for proteins in signaling pathways of growth factors known to regulate muscle mass.

    “In this study, the authors focus on two particular genes that are upregulated in women compared with men and that are known to code for proteins that are in signaling pathways of growth factors known to regulate muscle mass: growth factor receptor-bound protein 10 (GRB10) and activin receptor type-2A (ACVR2A).”
  • Over 3,000 genes are differentially regulated in male and female muscle.

    “The identification of over 3,000 genes differentially regulated in male and female muscle highlights the complex differences that occur in skeletal muscle from both sexes (96).”

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Authors
Welle, S., Tawil, R., & Thornton, C. A.
Affiliations
University of Rochester Medicine (US)
Corresponding author
Welle, Stephen
Venue
PLoS ONE
Published
2008-01-02
Volume
3
Issue
1
Pages
e1385
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2094746410
Cited by
224
References
62
Citations by year
2026: 8 · 2025: 22 · 2024: 19 · 2023: 27 · 2022: 24 · 2021: 23 · 2020: 9 · 2019: 12 · 2018: 16 · 2017: 5 · 2016: 8 · 2015: 6 · 2014: 9 · 2013: 5 · 2012: 4
FWCI
3.42
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • University of Rochester
  • National Institutes of Health
  • National Institute on Aging (AG18254, AG17891, P30AG018254, R01AG017891)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (AR/NS48143, K24AR048143)
  • National Center for Research Resources (RR-00044, M01RR000044)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Physical Performance
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
sex differences, skeletal muscle, gene expression, sexual dimorphism, muscle mass, Grb10, ACVR2B, IGF-1 signaling, facioscapulohumeral muscular dystrophy, mitochondrial proteins, ribosomal proteins, growth factor pathways
MeSH terms
Adult, Aged, Female, Gene Expression Regulation, Humans, Male, Middle Aged, Sex Factors, Muscle, Skeletal, Oligonucleotide Array Sequence Analysis

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