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Python绘图 | Nature不同细胞类型中标记基因的表达点图复现(包含完整代码)

  • 2026-04-15 11:41:53
Python绘图 | Nature不同细胞类型中标记基因的表达点图复现(包含完整代码)
在单细胞测序论文中,标记基因表达点图是一项“标配”可视化内容。它能在同一张图中同时呈现四个关键信息:基因在哪种细胞中表达?表达量多高?表达细胞的比例是多少?以及如何区分功能相似的细胞类型?本期推文将使用Python,完整复现发表于 《Nature》 杂志的论文 “Single-cell spatiotemporal dissection of the human maternal–fetal interface” 中的标记基因表达点图,并附上完整可复现代码。
原文中的结果图:Fig. 1

R代码

下面展示了如何用Python复现的过程,包含了绘制的完整代码。
由于原文没有提供源数据,复现图是用模拟数据进行的可视化。
1. 导入绘图相关的Python包:
from pathlib import Pathimport pandas as pdimport numpy as npimport matplotlib as mplimport matplotlib.pyplot as pltfrom matplotlib.colors import LinearSegmentedColormapfrom matplotlib import transforms
2. 定义绘图相关的元素:
CELL_TYPES = [    "VCT""EVT""SCT""DSC""eS""FB""PV""eEpi""Cili",    "mVEC""fVEC""LEC""B""T""dNK""M""HB""DC""Ery"]GENES = [    "TP63""TIMP3""IFI6""HLA-G""PRG2""ERVW-1""HOPX""DKK1""VIM",    "PGR""IGF1""BMP5""DPPN""ACTA2""AFF2""POU5F1""PAEP""KRT7",    "TP73""PECAM1""VWF""MECOM""PROX1""CCL21""IGHM""BCL11A",    "CD3D""GNLY""NKG7""MS4A7""CD14""MRC1""LYVE1""HLA-DRA",    "CD74""HBA1""HBB"]LEFT_NUMBERS = [18, 19, 17, 15, 16, 14, 13, 8, 9, 10, 11, 12, 6, 7, 5, 2, 1, 3, 4]LEFT_COLORS = [    "#5a4a9c""#f06597""#3f7fbf""#4caf50""#33a37a",    "#8b5a3c""#c4876a""#6f8ed6""#2ba88f""#e55c30",    "#f0b44d""#c8bc2f""#a843a8""#8f8fbe""#8fa34d",    "#c0a28a""#d2b681""#9ea8b8""#8a7466"]mpl.rcParams["font.family"] = "sans-serif"mpl.rcParams["font.sans-serif"] = ["Arial""DejaVu Sans""Liberation Sans"]mpl.rcParams["pdf.fonttype"] = 42   mpl.rcParams["ps.fonttype"] = 42
3. 绘图主函数:
def plot(dot_df: pd.DataFrame, out_png: Path, out_pdf: Path | None = None) -> None:    required = {"cell_type""gene""pct_exp""avg_exp_scaled"}    missing = required - set(dot_df.columns)    df = dot_df.copy()    df["cell_type"] = pd.Categorical(df["cell_type"], categories=CELL_TYPES, ordered=True)    df["gene"] = pd.Categorical(df["gene"], categories=GENES, ordered=True)    df = df.dropna(subset=["cell_type""gene"]).sort_values(["cell_type""gene"]).reset_index(drop=True)    x_map = {g: i for i, g in enumerate(GENES)}    y_map = {c: i for i, c in enumerate(CELL_TYPES)}    df["x"] = df["gene"].map(x_map).astype(float)    df["y"] = df["cell_type"].map(y_map).astype(float)    fig = plt.figure(figsize=(105), dpi=300)    fig.patch.set_facecolor("white")    ax = fig.add_axes([0.100.140.710.76])    ax.set_facecolor("white")    cmap = LinearSegmentedColormap.from_list(        "nature_bwr",        ["#2c5aa0""#6f8fc8""#f5f5f5""#e89b8e""#c23a2b"],    )    p = np.clip(df["pct_exp"].to_numpy(), 0.060.0)    s_min, s_max = 5.0140.0    sizes = s_min + (s_max - s_min) * np.sqrt(p / 60.0)    sc = ax.scatter(        df["x"],        df["y"],        s=sizes,        c=np.clip(df["avg_exp_scaled"].to_numpy(), 0.01.0),        cmap=cmap,        vmin=0,        vmax=1,        edgecolors="#6e6e6e",        linewidths=0.6,        alpha=1.0,    )    ax.set_xlim(-0.8len(GENES) - 0.2)    ax.set_ylim(-0.8len(CELL_TYPES) - 0.2)    ax.invert_yaxis()    ax.set_xticks(range(len(GENES)))    ax.set_xticklabels(GENES, rotation=90, ha="center", va="top", fontsize=12, fontstyle="italic")    ax.set_yticks(range(len(CELL_TYPES)))    ax.set_yticklabels(CELL_TYPES, fontsize=14)    ax.tick_params(axis="y", pad=8)    ax.tick_params(axis="x", length=3, width=0.8, color="#666666")    ax.tick_params(axis="y", length=0)    for side in ["top""right""left""bottom"]:        ax.spines[side].set_visible(True)        ax.spines[side].set_color("#8d8d8d")        ax.spines[side].set_linewidth(1.0)    trans = transforms.blended_transform_factory(ax.transAxes, ax.transData)    x_out = -0.12    for i, ct in enumerate(CELL_TYPES):        y = y_map[ct]        ax.scatter(            x_out,            y,            s=160,            c=LEFT_COLORS[i],            edgecolors="#6d6d6d",            linewidths=0.6,            zorder=7,            transform=trans,            clip_on=False,        )        ax.text(            x_out,            y,            str(LEFT_NUMBERS[i]),            color="black",            fontsize=9,            ha="center",            va="center",            fontweight="bold",            zorder=8,            transform=trans,            clip_on=False,        )    leg_ax = fig.add_axes([0.8450.500.140.38])    leg_ax.set_axis_off()    levels = [605040302010]    ys = np.linspace(0.850.15len(levels))    for yv, lv in zip(ys, levels):        s = s_min + (s_max - s_min) * np.sqrt(lv / 60.0)        leg_ax.scatter(0.25, yv, s=s, c="#8f8f8f", edgecolors="#5e5e5e", linewidths=1.0)        leg_ax.text(0.42, yv, f"{lv}", va="center", fontsize=12)    leg_ax.text(0.000.50"Fraction of cells\nin group (%)", rotation=90,                va="center", ha="center", fontsize=13)    leg_ax.set_xlim(01)    leg_ax.set_ylim(01)    cax = fig.add_axes([0.8720.150.0160.24])    cb = plt.colorbar(sc, cax=cax)    cb.set_ticks([0.00.51.0])    cb.ax.tick_params(labelsize=12)    cb.outline.set_edgecolor("#5e5e5e")    cb.outline.set_linewidth(1.0)    fig.text(0.8420.27"Mean expression\nin group", rotation=90,             va="center", ha="center", fontsize=13)    plt.savefig(out_png, dpi=300)    if out_pdf is not None:        plt.savefig(out_pdf, format="pdf")    plt.close(fig)

复现图如下

好了,本期内容到此结束,喜欢的小伙伴可以转发分享,收藏,别忘了来个三连击啊~~~

往期回顾

Python绘图 | 复现顶刊中机器学习SHAP特征重要性交互网络与个性化解释图(包含完整代码)
R绘图 | Science网络相关性热图复现(包含完整代码)
R绘图 | NC相关性矩阵热图复现(包含完整代码)
R绘图 | CNS 级相关性矩阵热图复现进阶教程(含完整代码)

参考文献:Wang, C., Zhou, Y., Wang, Y. et al. Single-cell spatiotemporal dissection of the human maternal–fetal interface. Nature (2026). https://doi.org/10.1038/s41586-026-10316-x

以上内容为原创,转载需声明出处。

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  1. CONNECT:[ UseTime:0.001089s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001378s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010447s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000694s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001451s ]
  6. SELECT * FROM `set` [ RunTime:0.002020s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001513s ]
  8. SELECT * FROM `article` WHERE `id` = 486018 LIMIT 1 [ RunTime:0.004030s ]
  9. UPDATE `article` SET `lasttime` = 1776259359 WHERE `id` = 486018 [ RunTime:0.043961s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000696s ]
  11. SELECT * FROM `article` WHERE `id` < 486018 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001619s ]
  12. SELECT * FROM `article` WHERE `id` > 486018 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010889s ]
  13. SELECT * FROM `article` WHERE `id` < 486018 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005278s ]
  14. SELECT * FROM `article` WHERE `id` < 486018 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009694s ]
  15. SELECT * FROM `article` WHERE `id` < 486018 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012239s ]
0.270581s