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Gene

OPN1MW

opsin 1, medium wave sensitive

Summary

Cytogenetic location
Xq28
Coordinates
Chromosome X: 154,182,596–154,196,861 (GRCh38)
Exons
6 exons across 14.3 kb
Protein
364 amino acids
Inheritance
X-linked recessive
Also known as
OPN1MW1, COD5
Previous symbols
GCP, CBBM, CBD
MANE Select transcript
ENST00000595290.6NM_000513.2
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

  • Achromatopsia

    • Achromatopsia (ACHM) is a rare autosomal recessive retinal disorder characterized by color blindness, nystagmus, photophobia, and severely reduced visual acuity due to the absence or impairment of cone function.

      • 1 GenCC submitter rates it definitive or strong

  • Colour Vision Deficiency

    • Red-Green Colour Vision DeficiencyX-linked recessive

      An X-linked difference in colour vision caused by changes in the OPN1LW and OPN1MW genes for the red- and green-sensitive cone pigments.

      • ClinGen rates the link definitive
      • 2 GenCC submitters rate it definitive or strong
      What knowing changes

      Knowing about it can help with education and career choices, as some jobs require normal colour vision.

    • Blue Cone MonochromacyX-linked recessive

      A rare X-linked condition in which both red and green cones do not work, causing reduced vision, nystagmus and very poor colour vision from infancy.

      • 1 GenCC submitter rates it definitive or strong
      What knowing changes

      Low-vision support and tinted lenses can help, and female relatives can be offered carrier testing.

Inheritance

X-linked recessive
The change is on the X chromosome, so one copy affects males, who have one X, while females with one are usually carriers. A carrier mother passes it on to each child with a one-in-two chance.

How OPN1MW is laid out

  • Coding sequence
  • Untranslated region
  • Intron
  • Direction of transcription
  • Known disease-causing sites
  • Stretches short reads find hard
Chromosome X, with a bracket where OPN1MW sits. OPN1MW and 42 genes near it on chromosome X, from 153,689,729 to 154,689,728.Chromosome XXq28p22.33p22.32p22.31p22.2p22.13p22.12p22.11p21.3p21.2p21.1p11.4p11.3p11.23p11.22p11.21p11.1q11.1q11.2q12q13.1q13.2q13.3q21.1q21.2q21.31q21.32q21.33q22.1q22.2q22.3q23q24q25q26.1q26.2q26.3q27.1q27.2q27.3q28153.8 Mb154 Mb154.2 Mb154.4 Mb154.6 MbSLC6A8: 153,687,914–153,696,591, forward strandSLC6A8BCAP31: 153,698,006–153,725,957, reverse strandBCAP31ABCD1: 153,724,495–153,744,755, forward strandABCD1PLXNB3: 153,764,179–153,779,346, forward strandSRPK3: 153,781,001–153,785,768, forward strandSRPK3IDH3G: 153,785,735–153,794,535, reverse strandIDH3GSSR4: 153,793,516–153,798,510, forward strandSSR4PDZD4: 153,802,161–153,830,935, reverse strandPDZD4L1CAM: 153,861,511–153,886,204, reverse strandL1CAM: 153,872,221–153,909,223, reverse strandAVPR2: 153,902,531–153,907,169, forward strandAVPR2ARHGAP4: 153,907,367–153,934,999, reverse strandNAA10: 153,928,799–153,935,083, reverse strandNAA10RENBP: 153,935,269–153,944,688, reverse strandRENBPHCFC1: 153,946,434–153,972,427, reverse strandHCFC1TMEM187: 153,972,290–153,983,194, forward strandTMEM187IRAK1: 154,010,501–154,020,650, reverse strandIRAK1MECP2: 154,021,573–154,137,103, reverse strandMECP2OPN1LW: 154,144,243–154,159,032, forward strandOPN1LWOPN1MW: 154,182,596–154,196,861, forward strandOPN1MWOPN1MW2: 154,219,756–154,233,286, forward strandOPN1MW2OPN1MW3: 154,257,582–154,271,090, forward strandOPN1MW3TEX28: 154,271,265–154,295,853, reverse strandTEX28TKTL1: 154,295,795–154,330,350, forward strandTKTL1FLNA: 154,348,524–154,374,643, reverse strandFLNAEMD: 154,379,205–154,381,574, forward strandEMDRPL10: 154,389,955–154,409,168, forward strandRPL10DNASE1L1: 154,401,236–154,412,119, reverse strandDNASE1L1TAFAZZIN: 154,409,456–154,421,726, forward strandATP6AP1: 154,428,618–154,436,517, forward strandGDI1: 154,436,600–154,443,467, forward strandGDI1FAM50A: 154,444,103–154,450,655, forward strandPLXNA3: 154,458,275–154,477,779, forward strandPLXNA3LAGE3: 154,477,598–154,479,291, reverse strandLAGE3UBL4A: 154,483,717–154,486,661, reverse strandUBL4ASLC10A3: 154,487,306–154,490,690, reverse strandFAM3A: 154,505,019–154,516,882, reverse strandG6PD: 154,517,825–154,547,584, reverse strandG6PDIKBKG: 154,541,179–154,568,543, forward strandIKBKGCTAG1A: 154,585,133–154,586,816, forward strandCTAG1ACTAG1B: 154,617,609–154,619,282, reverse strandCTAG1BCTAG2: 154,651,972–154,653,579, reverse strandCTAG2GAB3: 154,675,249–154,751,583, reverse strandGAB3Diagram of OPN1MW: 6 exons on the forward strand of chromosome XExon 5: 1 known disease-causing siteExon 1: 154,182,596–154,182,789, 194 basesExon 2: 154,187,770–154,188,066, 297 basesExon 3: 154,190,054–154,190,222, 169 basesExon 4: 154,191,688–154,191,853, 166 basesExon 5: 154,193,408–154,193,647, 240 basesExon 6: 154,195,930–154,196,861, 932 bases1234565′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 2 kb of the gene's 14.3 kb; 1,095 of those bases code for the protein.

How a genome test reads OPN1MW

1

position in OPN1MW where ClinVar classes a change as pathogenic or likely pathogenic

1 of them (100%) falls in a region short reads find hard.

  • Low mappability (1 site)Regions where 100 bp or 250 bp reads cannot be placed uniquely.
  • Segmental duplications (1 site)Copies of at least 1 kb sharing at least 90% identity with another part of the genome (paralogues, pseudogenes); reads may align to the wrong copy.

A whole genome covers all 14.3 kb of OPN1MW, introns included, not only the 2 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.
  • GenCC and ClinGen, released 2026-10-16: which conditions the gene is linked to, and how strongly.
  • The ACMG secondary findings list, SF v3.2.
  • 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.). OPN1MW gene: opsin 1, medium wave sensitive. Retrieved 17 October 2026, from https://dantelabs.com/genes/opn1mw

Vancouver

Dante Labs. OPN1MW gene: opsin 1, medium wave sensitive [Internet]. [cited 17 October 2026]. Available from: https://dantelabs.com/genes/opn1mw

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