A nucleic acid construct for increasing the yield of a biomolecule produced by a Chinese hamster ovary cell cultured in vitro, the nucleic acid construct comprising at least two different regions, wherein the regions are - a first region encoding for at least one miRNA stimulating cellular production of a biomolecule in a cell, the miRNA is selected from group 1, or - a second region encoding for at least one miRNA and/or miRNA inhibitor suppressing cell death, the miRNA is selected from group 2 and the miRNA-inhibitor inhibits a miRNA selected from group 3, and - a third region encoding for at least one miRNA regulating cell proliferation, wherein the miRNA is a miRNA of SEQ ID NO.: 160, wherein group 1 consists of SEQ ID NO.: 1, 2, 3, 4, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 25, 26, 27, 28, 29, 32, 34, 37, 39, 40, 41, 42, 44, 45, 46, 47, 48, 49, 51, 52, 53, 55, 56, 57, 58, 62, 63, 66, 67, 69, 70, 75, 76, 77, 80, 81, 82, 83, 86, 88, 90, 91, 93, 98, 99, 100, 101, 102, 103, 104, 106, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 120, 121, 128, 130, 132, 134, 136, 137, 138, 141, 142, 143, 147, 151, 152, 155, 158, 163, 165, 171, 174, 182, 183, 185, 186, 188, 190, 201, 203, 207, 211, 212, 214, 217, 222, 223, 228, 230, 233, 238, 239, 240, 254, 255, 269, 276, 278, 279, 285, and 294; group 2 consists of SEQ ID NO.: 1, 2, 3, 4, 6, 8, 9, 20, 52, 98, 5, 7, 24, 31, 33, 50, 54, 59, 60, 61, 64, 68, 71, 73, 74, 79, 85, 87, 89, 92, 94, 95 97, 145, 153, 154, 156, 159, 161, 166, 167, 168, 169, 170, 172, 175, 176, 178, 179, 180, 181, 184, 191, 192, 194, 195, 196, 197, 199, 200, 204, 205, 206, 208, 209, 210, 213, 216, 219, 220, 221, 224, 225, 226, 227, 229, 231, 236, 237, 241, 242, 243, 245, 247, 248, 251, 252, 253, 256, 257, 258, 259, 260, 262, 265, 266, 268, 271, 272, 273, 274, 277, 280, 282, 284, 289, 293, and 295; group 3 consists of SEQ ID NO.: 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 334, 335, 336, 337, 338, 339, 340, 341, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 361, 362, 363, 364, 365, 366, 367, 368, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 388, 389, 390, 391, 392, 393, 394, 395, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405, 406, 407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 433, 434, 435, 436, 437, 438, 439, 440, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 605, 607, 608, and 609, and wherein the miRNA inhibitor is an antagomir, a miRNA sponge or a miRNA decoy. - a first region encoding for at least one miRNA stimulating cellular production of a biomolecule in a cell, the miRNA is selected from group 1, or - a second region encoding for at least one miRNA and/or miRNA inhibitor suppressing cell death, the miRNA is selected from group 2 and the miRNA-inhibitor inhibits a miRNA selected from group 3, and - a third region encoding for at least one miRNA regulating cell proliferation,