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1 Supplemental material THE JOURNAL OF CELL BIOLOGY Gillespie et al., repressor complex induced by p38- Gillespie et al. Figure S1. Reduced fiber size after regeneration in p38- deficient muscle. (A) IPMyoD of extracts harvested at indicated times from CTX-injured C57BL/6 TA muscle with an antibody reactive to phospho-tyrosine and immunoblotted for p38-. (B) Immunoblots showing total protein levels for p38-. (C F) hematoxylin and eosin stained sections of uninjured (C and D) and CTX-injured (E and F) wild-type (C and E) and p38- / (D and F) TA muscle. (G) Fold change in S1

2 Figure S2. Reduced proliferation and elevated apoptosis in p38- deficient satellite cells. (A) Proliferation analysis of wild-type and p38- / satellite cells. Cells were grown and fixed at indicated times under growth conditions and immunostained for Ki67. The number of Ki67-positive cells is reported as a percentage of the total number of DAPI-positive nuclei. Error bars represent ±SEM for n = 3. (B) TUNEL staining of wild-type and p38- / satellite cells after 24 h of proliferation. TUNEL-positive cells are reported as a percentage of the total number of DAPI-positive nuclei. Error bars represent ±SEM for n = 3. (C) Immunoblot analysis of MyHC protein expression from proliferating and differentiating wild-type and p38- / satellite cell derived myoblasts. Tubulin was used as a loading control. (D) Immunoblot analysis, using the indicated antibodies, of C2C12 extracts expressing p38-, MKK6EE and p38-, or empty vector. Black lines indicate that intervening lanes have been spliced out. (E) Immunoblot analysis of differentiating C2C12 myoblasts expressing empty vector or MKK6EE. (F and G) Immunoblot analysis, using the indicated antibodies, of differentiating C2C12 myoblast (F) and 10T1/2 fibroblast (G) extracts expressing MKK6 and/or p38-, or empty vector. MyoDwt and MyoDmut were expressed in 10T1/2 fibroblasts as indicated. Tubulin was used as a loading control. fiber size from wild-type and p38- / TA muscle 21 d after CTX injury. Numbers are normalized to the contralateral TA muscle. Error bars represent standard ±SEM for n = 12. Asterisk denotes significance (P < 0.05). (F) Distribution of fiber sizes from wild-type and p38- / TA muscle 21 d after CTX injury. Contralateral TA is shown as a control. Sizes were determined computationally using Image J software (National Institutes of Health). ptyr, phosphotyrosine. Bar, 100 µm. S2

3 Figure S3. Mechanistic effects of p38- phosphorylation. (A) IP-kinase assays from 10T1/2 fibroblasts expressing MKK6EE and p38-, or empty vector. Extracts were immunoprecipitated with antibody reactive to the Myc tag on p38-, and incubated with the recombinant substrate GST-MyoD (full length), along with GST (negative) and GST-ATF2 (positive) as controls. (B) Endogenous MyoD ChIP assays on differentiating C2C12 myoblast extracts expressing empty vector or MKK6EE alone. (C) ChIP assays on C2C12 myoblast extracts expressing empty vector or p38- DN (T183A/Y185F) mutants after 24 h of differentiation. (D) C2C12 myoblasts expressing p38-, MKK6EE and p38-, or empty vector, were immunoprecipitated for the E protein HEB and immunoblotted for MyoD after 24 h of differentiation. (E) Immunoblots show total protein levels for MyoD and HEB. Tubulin was used as a loading control. (F and G) Endogenous H3K9-2me (F) and KMT1A (G) ChIP assays on differentiating C2C12 myoblast extracts expressing empty vector or MKK6EE alone. PCR was performed on the Igh enhancer as a control. The white line indicates that intervening lanes have been spliced out. (H) Immunoblots from nuclear extracts of 293T cells expressing wild-type or mutant MyoD in the presence or absence of Myc-KMT1A. DN, dominant-negative mutant; H3K9-2me, dimethylated histone H3 Lys9; MyoDmut, MyoD [S199A/S200A] mutant; MyoDwt, wild-type MyoD. MyoD repressor complex induced by p38- Gillespie et al. S3

4 Figure S4. Model demonstrating the biological role of p38- in regulating entry into the myogenic differentiation program. In wild-type muscle, p38- signaling allows for sufficient myogenic precursor amplification before the initiation of differentiation, thereby providing a pool of myocytes available for fusion. However, after satellite cell activation in p38- deficient muscle, myogenic precursors prematurely up-regulate myogenin expression, which impairs proliferation as a consequence of forced initiation of the differentiation program. As a result, the number of myocytes available for fusion is reduced, which prevents efficient myotube formation. S4

5 Figure S5. p38- activity and expression during differentiation. (A and B) Differentiation time course from C2C12 myoblasts showing p38- kinase activity (IP: phospho-tyrosine; immunoblot: p38- ) (A), and p38- and p38- protein expression (B). Tubulin was included as a loading control. (C and D) Coomassie blue stained gels from kinase assays on the N and C termini of MyoD (C), and a MyoD S199A/S200A mutant showing equal loading and expression of recombinant substrates (D). pcdna3 and MKK6EE + Myc p38- refer to the unphosphorylated control and phosphorylation reactions, respectively. Dotted lines indicate that different sized bands from the original blots were placed together in the same panel for ease of viewing using Photoshop software (Adobe). MyoD repressor complex induced by p38- Gillespie et al. S5

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