Evidence map›Paper›PMID 31767753›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2019

Photoperiodic and clock regulation of the vitamin A pathway in the brain mediates seasonal responsiveness in the monarch butterfly.

Samantha E Iiams, Aldrin B Lugena, Ying Zhang, Ashley N Hayden, Christine Merlin

Open access · bronzeAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 29 papers.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed
4.0field-weighted citation impact, top 5% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

29 citing papers in PubMed, 78 citations in OpenAlex.

  1. Article
  2. Article
  3. Emerging tools to advance neuroethology in butterflies and moths.Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology · 2026
    Review
  4. Review
  5. A Peptidergic Neural System Connects the Circadian Clock to the Photoperiodic Control of Reproductive Diapause in the BugThe Journal of neuroscience : the official journal of the Society for Neuroscience · 2025
    Article
  6. Article
  7. Noncanonical action of circadian clock genes controls winter diapause entry via the NuA4/TIP60 complex inProceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. The PBAP chromatin remodeling complex mediates summer diapause via H3K4me3-driven juvenile hormone regulation inProceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  13. Article
  14. Article
  15. Article
  16. Loss of functionaliScience · 2024
    Article
  17. Article
  18. Editorial: Rising stars in chronobiology 2022.Frontiers in physiology · 2024
    Article
  19. Article
  20. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 1 institution in 1 country.

Samantha E IiamsDepartment of Biology, Center for Biological Clocks Research, Texas A&M University, College Station, TX 77843.
Aldrin B LugenaDepartment of Biology, Center for Biological Clocks Research, Texas A&M University, College Station, TX 77843.
Ying ZhangDepartment of Biology, Center for Biological Clocks Research, Texas A&M University, College Station, TX 77843.ORCID 0000-0002-1238-0456
Ashley N HaydenDepartment of Biology, Center for Biological Clocks Research, Texas A&M University, College Station, TX 77843.
Christine MerlinDepartment of Biology, Center for Biological Clocks Research, Texas A&M University, College Station, TX 77843; cmerlin@bio.tamu.edu.
Texas A&M University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Seasonal adaptation to changes in light:dark regimes (i.e., photoperiod) allows organisms living at temperate latitudes to anticipate environmental changes. In nearly all animals studied so far, the circadian system has been implicated in measurement and response to the photoperiod. In insects, genetic evidence further supports the involvement of several clock genes in photoperiodic responses. Yet, the key molecular pathways linking clock genes or the circadian clock to insect photoperiodic responses remain largely unknown. Here, we show that inactivating the clock in the North American monarch butterfly using loss-of-function mutants for the circadian activators CLOCK and BMAL1 and the circadian repressor CRYPTOCHROME 2 abolishes photoperiodic responses in reproductive output. Transcriptomic approaches in the brain of monarchs raised in long and short photoperiods, summer monarchs, and fall migrants revealed a molecular signature of seasonal-specific rhythmic gene expression that included several genes belonging to the vitamin A pathway. We found that the rhythmic expression of these genes was abolished in clock-deficient mutants, suggesting that the vitamin A pathway operates downstream of the circadian clock. Importantly, we showed that a CRISPR/Cas9-mediated loss-of-function mutation in the gene encoding the pathway's rate-limiting enzyme,

Indexed as

PhotoperiodAnimalsBrainButterfliesCircadian ClocksInsect ProteinsPeriod Circadian ProteinsSeasonsVitamin AInsect ProteinsPeriod Circadian ProteinsVitamin Acircadian clocksCRISPR/Cas9insect photoperiodismmonarch butterflyvitamin A

Identifiers

PMID31767753
PMCPMC6911188
OpenAlexW2991515832

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.