Project description:We provide a proteomic profile for fast/glycolytic biceps femoris (BF) and slow/oxidative soleus (SOL) muscles using tandem Mass Tags (TMT)-based proteomic analysis.
Project description:We used phosphoproteomic profiling of slow-twitch (soleus, SOL) and fast-twitch (biceps femoris, BF) muscle to identify differences between these muscle types.
Project description:Analysis of soleus (SOL) and extensor digitorum longus (EDL) muscles isolated from Acta1-Cre+/4Fhet (as treatment) and Acta1-Cre-/4Fhet (as control) mice. Results provide unbiased gene expression profile of SOL and EDL muscles after 4F induction.
Project description:Because of its high plasticity and rapid growth rate, turkey skeletal muscle is an important model for studying mechanisms responsible for vertebrate skeletal muscle development and function. Skeletal muscle is composed of metabolically heterogeneous myofibers that exhibit high plasticity at both the morphological and transcriptional levels. The objective of this study was to employ microarray analysis to elucidate the differential gene expression between the tonic- “red” Anterior latissimus dorsi (ALD) muscle, the phasic- “white” Posterior latissimus dorsi (PLD), and “mixed”-phenotype Biceps femoris (BF) in 1-week and 19-week old male turkeys. A total of 170 differentially expressed genes were identified in the analyzed muscle samples (P<0.05). Gene Go analysis software was utilized to identify top gene networks and metabolic pathways involving differentially expressed genes. The largest differences were observed between ALD and PLD muscles, where 32 genes were over-expressed and 82 genes were under-expressed in ALD1-PLD1 comparison; and 70 genes were over-expressed and 70 under-expressed in ALD19-PLD19 comparison. The largest number of genes over-expressed in ALD muscles as compared to other muscles, code for extracellular matrix proteins such as dystroglycan and collagen. Furthermore, a number of genes involved in glycolytic metabolism were under-expressed in ALD muscles as compared to BF and PLD muscles. The gene analysis revealed that phenotypically “red” BF muscle has high expression of glycolytic genes usually associated with “white” muscle phenotype. Muscle-specific differences were observed in expression levels of genes coding for proteins involved in mRNA processing and translation regulation, proteosomal degradation, apoptosis, and insulin resistance.
Project description:To investigate the role of the circadian clock gene Bmal1 in skeletal muscle, we compared the circadian transcriptomes of fast tibialis anterior (TA) and slow soleus (SOL) skeletal muscles from muscle-specific Bmal1 KO (mKO) and their control Cre- littermates (Ctrl). Keyword: Circadian Transcriptome, time course 72 samples were analyzed, comprised of 4 experimental groups (Ctrl SOL, mKO SOL, Ctrl TA, mKO TA), with 3 biological replicates for each time point sampled every 4 hours for 24 hours. SOL and TA muscles were collected from the same animals, as indicated by Source Animal ID data column
Project description:To test the hypothesis that different muscles may express variable amounts of different isoforms of muscle genes, we applied a custom-designed exon microarray containing probes for 57 muscle-specific genes to assay the transcriptional profiles in sets of human adult, lower limb skeletal muscles. Muscle biopsies from 15 individuals were selected for analysis dissected from 21 anatomically different muscles collected from eight men and seven women, ranging from 61 to 91 years The muscle tissue samples collected included samples from 11 different thigh muscles––vastus medialis, vastus lateralis, vastus intermedialis, sartorius, gracilis, semimembranosus, semitendinosus, biceps femoris, adductor magnus, adductor longus, and rectus femoris––and 10 lower leg muscles––flexor digitorum longus, extensor digitorum longus, tibialis posterior, tibialis anterior, peroneus longus/brevis, extensor hallucis longus, gastrocnemius lateralis, gastrocnemius medialis, flexor hallucis longus, and soleus. Approximately five to seven muscle pieces were collected from each individual muscle sampled. The muscle sample pieces obtained for histological analysis measured roughly 10 mm x 5 mm, and the pieces for RNA isolation 5 mm x 5 mm. The samples were obtained directly from the proximal vital parts of the amputated limbs and processed immediately following their removal to avoid tissue degradation.To test the hypothesis that different muscles may express variable amounts of different isoforms of muscle genes, we applied a custom-designed Agilent exon microarray containing probes for 57 muscle-specific genes to assay the transcriptional profiles in sets of human adult, lower limb skeletal muscles
Project description:To investigate the role of the circadian clock gene Bmal1 in skeletal muscle, we compared the circadian transcriptomes of fast tibialis anterior (TA) and slow soleus (SOL) skeletal muscles from muscle-specific Bmal1 KO (mKO) and their control Cre- littermates (Ctrl). Keyword: Circadian Transcriptome, time course
Project description:Because of its high plasticity and rapid growth rate, turkey skeletal muscle is an important model for studying mechanisms responsible for vertebrate skeletal muscle development and function. Skeletal muscle is composed of metabolically heterogeneous myofibers that exhibit high plasticity at both the morphological and transcriptional levels. The objective of this study was to employ microarray analysis to elucidate the differential gene expression between the tonic- “red” Anterior latissimus dorsi (ALD) muscle, the phasic- “white” Posterior latissimus dorsi (PLD), and “mixed”-phenotype Biceps femoris (BF) in 1-week and 19-week old male turkeys. A total of 170 differentially expressed genes were identified in the analyzed muscle samples (P<0.05). Gene Go analysis software was utilized to identify top gene networks and metabolic pathways involving differentially expressed genes. The largest differences were observed between ALD and PLD muscles, where 32 genes were over-expressed and 82 genes were under-expressed in ALD1-PLD1 comparison; and 70 genes were over-expressed and 70 under-expressed in ALD19-PLD19 comparison. The largest number of genes over-expressed in ALD muscles as compared to other muscles, code for extracellular matrix proteins such as dystroglycan and collagen. Furthermore, a number of genes involved in glycolytic metabolism were under-expressed in ALD muscles as compared to BF and PLD muscles. The gene analysis revealed that phenotypically “red” BF muscle has high expression of glycolytic genes usually associated with “white” muscle phenotype. Muscle-specific differences were observed in expression levels of genes coding for proteins involved in mRNA processing and translation regulation, proteosomal degradation, apoptosis, and insulin resistance. The study utilized Nicholas turkey males at two different stages of growth (1 week old: high satellite cell mitotic activity; 19 weeks old: low satellite cell mitotic activity, hypertrophy, market age). Six 1-week-old and six 19-week-old Nicholas turkey males (Meleagris gallopavo) were randomly selected from a single flock. The experiments were designed to compare genes characterizing muscle fiber phenotype at each time point, and to elucidate age-related differences in gene expression levels. Each analyzed cDNA sample was derived from six pooled RNA samples, resulting with six cDNA samples per muscle (one cDNA per bird). To minimize dye bias, the cDNA samples were labeled either with Cy3 or Cy5. A total of 17 Turkey Skeletal Muscle Long Oligo (TKSMLO) microarrays were utilized. Birds were randomly assigned to each array and the cDNA hybridizations we performed at random. The array data was Log2 transformed and then normalized by using locally weighed regression and smoothing within each array and across all arrays. Mixed model ANOVA with Bonferroni correction of P=0.05 for multiple testing was performed to increase the sensitivity of detected differences in gene expression levels.
Project description:Amyotrophic lateral sclerosis (ALS) is a lethal motor neuron disease that progressively debilitates neuronal cells that control voluntary muscle activity. In a mouse model of ALS that expresses mutated human superoxide dismutase 1 (SOD1-G93A) skeletal muscle is one of the tissues affected early by mutant SOD1 toxicity. Fast-twitch and slow-twitch muscles are differentially affected in ALS patients and in the SOD1-G93A model, fast-twitch muscles being more vulnerable. We used miRNA microarrays to investigate miRNA alterations in fast-twitch (EDL) and slow-twitch (soleus) skeletal muscles of symptomatic SOD1-G93A animals and their age-matched wild type littermates. At age of 90 days RNA was extracted from extensor digitorum longus (EDL) and soleus (SOL) muscles of male SOD1-G93A animals and their age-matched wild type male littermates. RNA was hybridized on Affymetrix Multispecies miRNA-2_0 Array.