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Supplementary Tables. Table S1. RNA extraction details and primer combinations used for 16S rRNA, mcrA mRNA, and dsrAB mRNA clone libraries for all the cores. Core Depth (cmbsf) 16S rRNA Dec 06 24-27 Jul 05-2 54-57 Jul 05-2 54-57 Jul 08-2 48-51 Jul 05-1 60-63 Dec 06 69-72 Jul 05-2 87-90 Jul 05-2 87-90 Jul 05-2 87-90 Jul Jul Jul Jul Jul Jul Jul Jul Jul mcrA mRNA 08-2 3-6 08-2 9-12 08-2 18-21 05-2 54-57 08-2 48-51 05-1 60-63 05-1 87-90 05-1 87-90 05-2 87-90 RT-PCR # combined for sequencing Weight (g) or volume (ml) of sample Method of RNA extraction Primersa # clones A8f-A915r A8f-A1492r/A8f-A1492r A8f-A1492r/A21f-A915r A8f-A915r A8f-A1492r/A21f-A915r A8f-A915r A21f-EelMS932r A21f-A915r A8f-A915r 52 30 61 33 68 90 30 25 43 1 3 1 1 1 1 3 1 3 2.78 g 4.5 ml 4.5 ml 2.06 g 4 ml 4.96 g 3 ml 3 ml 3 ml Phenol/BB Phenol/BB Phenol/BB MoBio PS Phenol/BB Phenol/BB Phenol/BB Phenol/BB Phenol/BB ANME-1 mcrf/r ANME-1 mcrf/r ANME-1 mcrf/r ME1-2/ME1-2 ANME-1 mcrf/r ME1-MCRr/MCRf-ME2 ME1-2/ME1-2 MCRf-r/MCRf-r ME1-2/ME1-2 12 26 30 18 36 43 2 37 3 1 1 1 3 1 3 3 3 3 2.18 g 1.98 g 1.98 g 4.5 ml 2.06 g 4 ml 3 ml 3 ml 3 ml MoBio PS MoBio PS MoBio PS Phenol/BB MoBio PS Phenol/BB Phenol/BB Phenol/BB Phenol/BB b c dsrAB mRNA Dec 06 24-27 Dsr1f-4r/1f1-1r1 32 2 2.78 g Phenol/BB Jul 05-2 51-54 Dsr1f-4r/1f1-1r1 79 2 3.44 g Phenol/BB Jul 05-1 60-63 Dsr1f-4r/1f1-1r1 7 3 3.44 g Phenol/BB Jul 05-1 84-87 Dsr1f-4r/1f1-1r1 29 1 4.70 g Phenol/BB a See Table S2 for primer sequences. When two primer sets are listed, the first was used for initial RT-PCR and the second for nested PCR. b Some samples had multiple identical and parallel RT-PCR amplifications combined for sequencing. c Phenol/BB stands for the phenol and bead-beating method as described previously (1) and Mobio PS stands for the MoBio RNA PowerSoil kit, used as described in its instructions. Table S2. Primers used for reverse transcription and amplification for cDNA clone libraries Primer Target gene Predicted target group Sequence (5’ to 3’)a Archaea Archaea Archaea Archaea ANME-2 Sulfate reducers Sulfate reducers Sulfate reducers Sulfate reducers Methanogens Methanogens Methanogens Methanogens ANME-1 ANME-1 TCC GGT TGA TCC TGC C TTC CGG TTG ATC CYG CCG GA GTG CTC CCC CGC CAA TTC CT GGC TAC CTT GTT ACG ACT T AGC TCC ACC CGT TGT AGT ACS CAY TGG AAG CAC G GTG TAG CAG TTA CCG CA CAG GAY GAR CTK CAC CG CCC TGG GTR TGR AYR AT TAY GAY CAR ATH TGG YT ACR TTC ATN GCR TAR TT GCM ATG CAR ATH GGW ATG TC TCA TKG CRT AGT TDG GRT AGT GAC CAG TTG TGG TTC GGA AC ATC TCG AAT GGC ATT CCC TC A8f A21f A915r A1492r EelMS-932r Dsr1f Dsr4r 1f1 1r1 MCRfb MCRr ME1b ME2b ANME1-mcr1 ANME1-mcr2 16S 16S 16S 16S 16S dsrA dsrB dsrA dsrB mcrA mcrA mcrA mcrA mcrA mcrA CARD-FISH Probe Formamide concentration (%) 60 60 Predicted target group Sequence (5’ to 3’) ANME-1 ANME-2 Bacteria 55 60 Archaea Putative AOM syntrophic SRB AGT TTT CGC GCC TGA TGC AGC TCC ACC CGT TGT AGT GCA GCC ACC CGT AGG TGT and GCT GCC ACC CGT AGG TGT and GCT GCC TCC CGT AGG AGT GTG CTC CCC CGC CAA TTC CT TCC ACT TCC CTC TCC CAT Target gene Predicted target group Sequence (5’ to 3’) ANME-1 GCT TTC AGG GAA TAC TGC ANME1-350 EelMS932 Eub I-III Arc915 DSS 658 qPCR/RTqPCR primer ANME1-628f 16S Anneal temp (°C) 50 or 58 50 50 or 58 55 59 54 54 48 48 50 50 55 55 58 58 Ref Hybridization temp (°C) Ref 35 35 35 (4) (4) (10) 35 35 (11) (12) Anneal temp (°C) 60 Ref (2) (3) (3) (2) (4) (5) (5) (6) (6) (7) (7) (8) (8) (9) (9) This study (4) ANME1-830r 16S ANME-1 TCG CAG TAA TGC CAA CAC 60 a Y = C/T; R = A/G; M = A/C; W = A/T; K = G/T; H = A/C/T; D = A/G/T b All 5 ANME-1 fosmids containing mcrA from (Hallam et al, 2003)(13) had 4 mismatches to ME1, 2 mismatches to ME2, 2 mismatches to mcrF, and 0 mismatches to mcrR. Therefore, lack of amplification with ME1, ME2, or mcrF primers is not good evidence of the absence of ANME-1 mRNA. Supplementary Figures. Supplemental Figure S1. Neighbor-joining tree of methanogen-related archaeal 16S rRNA transcript sequences, with distance- or parsimony-based bootstrap support (>60%) from 1000 repetitions listed at the nodes, respectively, excluding the poorly aligned helix 6. Numbers of clones represented by each 97% OTU group within each core and depth are shown in parentheses. Cores are named A for Jul 05-1, B for Jul 05-2, E for Dec 06, and G for Jul 08-2. Clones from the AOM zone are in red, clones from the methanogenesis zone are in blue, and tree was rooted with Methanocaldococcus jannaschii. Scale bar represents 10% distance. Supplemental Figure S2. Neighbor-joining trees of amino acid translations of dsrAB mRNA cDNA following the groupings of Leloup et al. (2007) (14) and Zverlov et al. (2005) (15), with distance- and then parsimony-based bootstrap support (>60%) from 1000 repetitions listed at the nodes. Numbers of clones represented by each 97% OTU group (determined from nucleic acids) are shown in parentheses. Clones from the AOM zone are in red, clones from the methanogenesis zone are in blue, with naming conventions as for Figure S1. Supplemental Figure S3. Percentage of positive RT-PCR amplification attempts for mcrA mRNA (using only general mcrA primers, excluding the ANME-1 mcrf/r which are specific for ANME-1) and dsrAB mRNA within the AOM (red) and the methanogenic (blue) zones for cores Jul 05-1, Jul 05-2, Dec 06, and Jul 08-2. Values are significantly different between AOM and methanogenesis zones (p > 99% for mcrA, p > 98% for dsrA) with a two-tailed chi-squared test, and the numbers written on the bars are the total numbers of amplification attempts. Only amplification attempts with primers and RTPCR conditions that had previously been shown to result in a positive amplification were included. Supplemental Figure S4. Map of the coast of North Carolina and the White Oak River, near Beaufort, North Carolina. Inset shows the location of station H as the river opens up into brackish estuarine sediments. Map made using the free Online Map Creation tool at http://www.aquarius.ifm-geomar.de. References 1. 2. Biddle JF, et al. (2006) Heterotrophic archaea dominate sedimentary subsurface ecosystems off Peru. Proc. Natl. Acad. Sci. USA 103(10):38463851. Teske A, et al. (2002) Microbial diversity of hydrothermal sediments in the Guaymas Basin: evidence for anaerobic methanotrophic communities. Appl. Environ. Microbiol. 68(4):1994-2007. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. DeLong EF (1992) Archaea in coastal marine environments. Proc. Natl. Acad. Sci. USA 89:5685-5689. Boetius A, et al. 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Hallam SJ, Girguis PR, Preston CM, Richardson PM, & DeLong EF (2003) Identification of methyl coenzyme M reductase A (mcrA) genes associated with methane-oxidizing archaea. Appl. Environ. Microbiol. 69(9):5483-5491. Leloup J, et al. (2007) Diversity and abundance of sulfate-reducing microorganisms in the sulfate and methane zones of a marine sediment, Black Sea. Environ. Microbiol. 9(1):131-142. Zverlov V, et al. (2005) Lateral gene transfer of dissimilatory (bi)sulfite reductase revisited. J. Bacteriol. 187(6):2203-2208.