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SLC44 choline transporter-like family C

Unless otherwise stated all data on this page refer to the human proteins. Gene information is provided for human (Hs), mouse (Mm) and rat (Rn).


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Members of the choline transporter-like family are encoded by five genes (CTL1-CTL5) with further diversity occurring through alternative splicing of CTL1, 4 and 5 [9]. CTL family members are putative 10TM domain proteins with extracellular termini that mediate Na+-independent transport of choline with an affinity that is intermediate to that of the high affinity choline transporter CHT1 (SLC5A7) and the low affinity organic-cation transporters [OCT1 (SLC22A1) and OCT2 (SLC22A2)] [6]. CLT1 is expressed almost ubiquitously in human tissues [11] and mediates choline transport across the plasma and mitochondrial membranes [5]. Transport of choline by CTL2, which in rodents is expressed as two isoforms (CTL2P1 and CLTP2; [3]) in lung, colon, inner ear and spleen and to a lesser extent in brain, tongue, liver, and kidney, has only recently been demonstrated [3,8]. CTL3-5 remain to be characterized functionally.


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CTL1 (Choline transporter-like 1 / SLC44A1) C Show summary »

CTL2 (Choline transporter-like 2 / SLC44A2) Show summary »

Target Id 1205
Nomenclature Choline transporter-like 2
Systematic nomenclature SLC44A2
Common abbreviation CTL2
Previous and unofficial names choline transporter-like protein 2 | solute carrier family 44, member 2 | solute carrier family 44 (choline transporter), member 2 | solute carrier family 44 | solute carrier family 44 member 2
Genes SLC44A2 (Hs), Slc44a2 (Mm), Slc44a2 (Rn)
Ensembl ID ENSG00000129353 (Hs), ENSMUSG00000057193 (Mm), ENSRNOG00000031824 (Rn)
UniProtKB AC Q8IWA5 (Hs), Q8BY89 (Mm), B4F795 (Rn)
Bioparadigms SLC Tables SLC44A2 (Hs)

CTL3 (Choline transporter-like 3 / SLC44A3) Show summary »

CTL4 (Choline transporter-like 4 / SLC44A4) Show summary »

CTL5 (Choline transporter-like 5 / SLC44A5) Show summary »


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Further reading

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How to cite this family page

Database page citation:

SLC44 choline transporter-like family. Accessed on 16/04/2024. IUPHAR/BPS Guide to PHARMACOLOGY,

Concise Guide to PHARMACOLOGY citation:

Alexander SPH, Fabbro D, Kelly E, Mathie AA, Peters JA, Veale EL, Armstrong JF, Faccenda E, Harding SD, Davies JA et al. (2023) The Concise Guide to PHARMACOLOGY 2023/24: Transporters. Br J Pharmacol. 180 Suppl 2:S374-469.