Abstract
Developmental time is a key life-history trait with large effects on Darwinian fitness. In many insects, developmental time is currently under strong selection to minimize ecological mismatches in seasonal timing induced by climate change. The genetic basis of responses to such selection, however, is poorly understood. To address this problem, we set up a long-term evolve-and-resequence experiment in the beetle Tribolium castaneum and selected replicate, outbred populations for fast or slow embryonic development. The response to this selection was substantial and embryonic developmental timing of the selection lines started to diverge during dorsal closure. Pooled whole-genome resequencing, gene expression analysis and an RNAi screen pinpoint a 222 bp deletion containing binding sites for Broad and Tramtrack upstream of the ecdysone degrading enzyme Cyp18a1 as a main target of selection. Using CRISPR/Cas9 to reconstruct this allele in the homogenous genetic background of a laboratory strain, we unravel how this single deletion advances the embryonic ecdysone peak inducing dorsal closure and show that this allele accelerates larval development but causes a trade-off with fecundity. Our study uncovers a life-history allele of large effect and reveals the evolvability of developmental time in a natural insect population.
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Data availability
Sequencing reads have been deposited in NCBIs Sequencing Read Archive as BioProject PRJNA942224. All other data are provided as supplementary data files. Source data are provided with this paper.
Code availability
All custom code is available in Zenodo at https://doi.org/10.5281/zenodo.8395048 ref. 89. All other code used is referenced.
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Acknowledgements
We thank R. Jacobs for building the selection machine; K. Koops for taking care of the beetles; G. Lamers and J. Willemse for help with confocal live imaging; and M. Averof and B. Zwaan for experimental advice. M. Averof, P. Brakefield, M. Richardson and B. Zwaan substantially improved the manuscript. S.C. and D.C. were supported by the Chinese Scholarship Council (scholarship 201808210285 to S.C. and 201906280500 to D.C.).
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J.v.d.H. and M.v.d.Z. share last authorship of this work. S.C. analysed and performed developmental staging, qPCR, RNAi, genotyping, ecdysone measurements, microscopy and CRISPR/Cas9 gene editing. E.A.M.P. contributed to qPCR and data analysis. J.v.d.S. contributed to RNAi and genotyping. K.M.B., F.V. and J.S.B. collected life-history data. A.H. performed in situ hybridization. C.G.C.J. performed and analysed the artificial selection process. D.C. developed and analysed the dynamic model of Cyp18a1 and ecdysone regulation. R.M.H.M. supervised this mathematical modelling. J.v.d.H. analysed and visualized the pooled resequencing data and life-history data, and developed the population genetic model. C.G.C.J. and M.v.d.Z. conceived the study. S.C., C.G.C.J., J.v.d.H. and M.v.d.Z. designed the experiments. M.v.d.Z. wrote the paper with substantial input from J.v.d.H., and feedback from S.C., C.G.C.J., E.A.M.P. and R.M.H.M.
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Extended data
Extended Data Fig. 1 Life history traits of the selection lines.
(a) Pupal DT (days from pupation to eclosion; means ± 2 × s.e.m.) of the selection lines. Selection regime had an effect (χ2 = 10.75; df = 2; p = 0.046): pupae from the fast lines develop significantly faster than those of the non-selected lines (χ2 = 8.13; df = 1; p = 0.004). Sex had no effect (χ2 = 0.017; df = 1; p = 0.897). N = 48 for each selection line. b, Total postembryonic developmental time of the selection lines (days from hatching to eclosion; means ± 2 × s.e.m.). Selection regime had an effect (χ2 = 22.98; df = 2; p = 0.00001): fast lines develop significantly faster than the non-selected lines (χ2 = 19.43; df = 1; p = 0.00001). Sex had no effect (χ2 = 0.2647; df = 1; p = 0.61). N = 48 for each selection line. (c) Growth rate defined as adult weight (see e) divided by total postembryonic time (see b) of an individual (mg/day; means ± 2 x s.e.m.). Selection regime had an effect (χ2 = 11.099; df = 2; p = 0.0039), but the fast lines are not significantly different from the slow lines (χ2 = 2.34; df = 1; p = 0.127). Sex had no significant effect (χ2 = 3.42; df = 1; p = 0.065). N = 48 for each selection line. (d) Pupal weight in the selection lines (mg; means ± 2 x s.e.m). Sex had an effect; closed circles are male, open circles are female means (χ2 = 4.24; df = 1; p = 0.039). Selection regime also had an effect (χ2 = 17.84; df = 2; p = 0.00013): pupae from the slow lines are heavier than those of the non-selected lines (χ2 = 13.09; df = 1; p = 0.0003). N = 48 for each selection line. (e) Adult weight in the selection lines (mg; means ± 2 x s.e.m.). Sex had an effect (χ2 = 6.04; df = 1; p = 0.014), closed circles are male, open circles are female means. Selection regime also had an effect (χ2 = 11.08; df = 2; p = 0.039): adults of the slow lines are significantly heavier than adults of the non-selected lines (χ2 = 7.78; df = 1; p = 0.005). N = 48 for each selection line. (f) Life span in the selection lines (weeks as adult; means ± 2 × s.e.m). Selection regime had no effect (χ2 = 4.6, df = 2, p = 0.10). N = 90 for each selection line, see Methods.
Extended Data Fig. 2 Numerical staging table for Tribolium castaneum.
Largely based on93,94. (a) 0 = no nuclei at surface; (b) 1 = undifferentiated blastoderm (equal nuclei at the surface). (c) 2 = differentiated blastoderm (the large polyploid nuclei of the serosa can be distinguished from the more dense, smaller nuclei of the germ rudiment). (d) 3 = gastrulation (amnion and serosa fold over the embryo; serosal window not yet closed). (e) 4 = extending germband (serosa closed). (f) 5 = extended germ band (distance between posterior end and head is small, size bar; limbs are buds). (g) 6 = limbs growing and extending (head and posterior of the germband still close, see size bar; limbs well developing and extending). (h) 7 = retracting germband (dorsal distance between head and posterior end of the embryo increases again). (i) 8 = completely retracted germband. (j) 9 = start of dorsal closure (rupture of the extraembryonic membranes, dorsal organ formation). (k) 10 = dorsal closure in progress (dorsal organ flatter, lateral sides of the embryo have moved towards dorsal). (l) 11 = dorsal closure completed (lateral sides of the embryo dorsally fused). (m) 12 = hatching (still in vitelline membrane). (n) 13 = hatched (out of vitelline membrane). Scalebar in (a) = 200 µm and applies to all panels.
Extended Data Fig. 3 Manhattan plot of SNPs that differ in allele frequency between the Slow and Non-Selected lines.
P values of SNPs, based on a GLM contrasting the slow (n = 2) and the non-selected (n = 2) lines (see Methods), along the 10 chromosomes of Tribolium castaneum. In total, 1258 SNPs differ in frequency significantly (above the red line = q < 0.01, −logep > 33.0538).
Extended Data Fig. 4 Embryonic phenotypes upon Cyp18a1 pRNAi.
(a) Numbers (percentages) of the different phenotypic classes from one fixation analysis (upper 4 rows), in which Cyp18a1 dsRNA injected mothers were allowed to lay eggs for one day, and batches of 25-50 eggs were fixed every subsequent day for DAPI staining and microscopic analysis. Percentages of developmental arrests are indicated with dark grey background, normal development with white background. The total number of developmental arrests corresponded well to the number of unhatched eggs after the pRNAi screen for developmental time (lower two rows). In 20% of the embryos, we did not observe any start of development at all (upper row), compared to 7.8% in the control RNAi. No developmental arrests were observed upon control pRNAi. (b) Control RNAi, normal blastoderm stage. (c) Cyp18a1 RNAi. Developmental arrests at the blastoderm stage were recognized by irregular positioning of aberrant nuclei. (d) Control RNAi. Normal extending germband (fully extended in (d)). (e) Developmental arrests during germband extension were recognized by shortened and irregular germbands. (f) Control RNAi, normal dorsal closure. (g) Cyp18a1 RNAi. Embryos that were arrested during dorsal closure were still open at the dorsal side, but showed otherwise advanced development. Scale bar in (b) = 200 μm and applies to panels b-g.
Extended Data Fig. 5 Allele frequency of F in a natural population is 0.81.
Genotyping PCR (Ethidium bromide staining shown on agarose gel) of one sample of 48 beetles from the (expanded) wild population collected by Rentokil from a bakery in The Netherlands (see Methods). 31 show only a 740 bp band (homozygous F allele), 2 show only a 942 bp band (homozygous S allele), and 14 are heterozygote (both bands + a hybrid band present). Thus the allele frequency of F is 0.81, and S is 0.19. Ladder is GeneRuler 1kb plus DNA ladder (Invitrogen).
Supplementary information
Supplementary Information
Modelling theory.
Supplementary Tables 1–4
Supplementary Tables 1–4.
Supplementary Video 1
Live imaging of a representative GA-1/nGFP (upper) and a representative CRISPR/nGFP (lower) heterozygote embryo. Time since egg lay is indicated in the middle (hh:mm:ss). The completely retracted germband stage (indicated by appearing text) occurs at the same moment. However, the time interval between the completely retracted germband and the start of dorsal closure (indicated by appearing text) is shorter in the CRISPR/nGFP embryo.
Supplementary Data 1
Alignments of cloned Sanger-sequenced PCR products from the selection lines.
Supplementary Data 2
FIMO output. See Methods.
Supplementary Data 3
Aligned sequences of the CRISPR alleles present in our stock.
Source data
Source Data Fig. 1c,d, 2d, 3a,f, 5d,e and Extended Data Figs. 1a–e,f
Statistical source data.
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Cheng, S., Jacobs, C.G.C., Mogollón Pérez, E.A. et al. A life-history allele of large effect shortens developmental time in a wild insect population. Nat Ecol Evol 8, 70–82 (2024). https://doi.org/10.1038/s41559-023-02246-y
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DOI: https://doi.org/10.1038/s41559-023-02246-y