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Gene

PER2

period circadian regulator 2

Summary

Cytogenetic location
2q37.3
Coordinates
Chromosome 2: 238,244,044–238,288,610 (GRCh38)
Exons
23 exons across 44.6 kb
Protein
1,255 amino acids
Also known as
KIAA0347
MANE Select transcript
ENST00000254657.8NM_022817.3
Locus type
gene with protein product
  • Very high
  • Confident
  • Low
  • Very low

Reference genomeGRCh38

Positions on gene and variant pages follow this choice, in this browser.

Curated reports relevant to this gene

No Genome Test report reads PER2 yet. The test sequences your whole genome, so your data includes it all the same.

How PER2 is laid out

  • Coding sequence
  • Untranslated region
  • Intron
  • Direction of transcription
  • Known disease-causing sites
  • Stretches short reads find hard
Chromosome 2, with a bracket where PER2 sits. PER2 and 13 genes near it on chromosome 2, from 237,766,327 to 238,766,326.Chromosome 22q37.3p25.3p25.2p25.1p24.3p24.2p24.1p23.3p23.2p23.1p22.3p22.2p22.1p21p16.3p16.2p16.1p15p14p13.3p13.2p13.1p12p11.2p11.1q11.1q11.2q12.1q12.2q12.3q13q14.1q14.2q14.3q21.1q21.2q21.3q22.1q22.2q22.3q23.1q23.2q23.3q24.1q24.2q24.3q31.1q31.2q31.3q32.1q32.2q32.3q33.1q33.2q33.3q34q35q36.1q36.2q36.3q37.1q37.2q37.3237.8 Mb238 Mb238.2 Mb238.4 Mb238.6 MbLRRFIP1: 237,627,550–237,813,682, forward strandLRRFIP1RBM44: 237,798,389–237,842,808, forward strandRBM44RAMP1: 237,858,893–237,923,438, forward strandRAMP1UBE2F: 237,966,827–238,051,730, forward strandUBE2FUBE2F-SCLY: 237,967,014–238,099,412, forward strandUBE2F-SCLYSCLY: 238,060,876–238,099,413, forward strandSCLYESPNL: 238,100,340–238,133,287, forward strandESPNLKLHL30: 238,138,649–238,152,947, forward strandKLHL30ERFE: 238,158,928–238,168,900, forward strandERFEILKAP: 238,170,399–238,203,761, reverse strandILKAPHES6: 238,237,903–238,240,680, reverse strandHES6PER2: 238,244,044–238,288,610, reverse strandPER2IFT54: 238,320,441–238,402,114, forward strandIFT54ASB1: 238,426,742–238,452,250, forward strandASB1Diagram of PER2: 23 exons on the reverse strand of chromosome 2Exon 6: 1 known disease-causing siteExon 23: 238,244,044–238,246,524, 2,481 basesExon 22: 238,249,062–238,249,212, 151 basesExon 21: 238,250,551–238,250,743, 193 basesExon 20: 238,251,599–238,251,761, 163 basesExon 19: 238,252,912–238,253,702, 791 basesExon 18: 238,255,657–238,255,911, 255 basesExon 17: 238,256,922–238,257,086, 165 basesExon 16: 238,258,276–238,258,400, 125 basesExon 15: 238,258,497–238,258,644, 148 basesExon 14: 238,259,969–238,260,053, 85 basesExon 13: 238,260,828–238,260,953, 126 basesExon 12: 238,261,729–238,261,837, 109 basesExon 11: 238,262,191–238,262,344, 154 basesExon 10: 238,262,952–238,263,058, 107 basesExon 9: 238,265,512–238,265,590, 79 basesExon 8: 238,268,056–238,268,198, 143 basesExon 7: 238,268,923–238,268,974, 52 basesExon 6: 238,271,312–238,271,513, 202 basesExon 5: 238,273,070–238,273,191, 122 basesExon 4: 238,275,743–238,275,897, 155 basesExon 3: 238,277,131–238,277,193, 63 basesExon 2: 238,277,707–238,277,955, 249 basesExon 1: 238,288,349–238,288,610, 262 bases2322201816141210864215′3′

Exons of the gene's MANE Select transcript (release v1.5), from NCBI and EMBL-EBI, on the GRCh38 reference genome.

Chromosome bands from UCSC's GRCh38 ideogram (2022-10-29).

Nearby genes from Ensembl release 116, on GRCh38.

Exons make up 6.4 kb of the gene's 44.6 kb; 3,768 of those bases code for the protein.

How a genome test reads PER2

1

position in PER2 where ClinVar classes a change as pathogenic or likely pathogenic

None of them falls in a region short reads find hard.

A whole genome covers all 44.6 kb of PER2, introns included, not only the 6.4 kb of exons.

Where this comes from

  • HGNC: the gene's symbol, name, other symbols and location.
  • MANE Select v1.5, from NCBI and EMBL-EBI: the transcript, its exons and coding sequence.
  • ClinVar and the GIAB stratifications: known disease-causing sites, and the regions short reads find hard.
  • The Human Phenotype Ontology, release 2026-09-01: the traits linked to the gene. Find out more at hpo.jax.org.
  • Data release 2026.10.16-c6eea6bf.

Cite this page

APA

Dante Labs. (n.d.). PER2 gene: period circadian regulator 2. Retrieved 17 October 2026, from https://dantelabs.com/genes/per2

Vancouver

Dante Labs. PER2 gene: period circadian regulator 2 [Internet]. [cited 17 October 2026]. Available from: https://dantelabs.com/genes/per2

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