DOLK

UniProt ID: Q9UPQ8
Organism: Homo sapiens
Review Status: INITIALIZED
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Gene Description

DOLK is dolichol kinase, a polytopic endoplasmic reticulum membrane enzyme that catalyzes the CTP-dependent phosphorylation of dolichol to dolichyl monophosphate (Dol-P), the terminal step in de novo Dol-P biosynthesis (EC 2.7.1.108). Dol-P is the essential lipid carrier that primes assembly of the dolichol-linked oligosaccharide for protein N-linked glycosylation and is also required for O-mannosylation, C-mannosylation and GPI-anchor biosynthesis, so DOLK supplies the activated lipid carrier used throughout the glycosylation system. The enzyme has a cytoplasmically oriented CTP-binding site and belongs to the polyprenol kinase family. Loss-of-function mutations cause DOLK-CDG (congenital disorder of glycosylation type Im), whose features include dilated cardiomyopathy (linked to deficient alpha-dystroglycan O-mannosylation), ichthyosis and neurological disease.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005789 endoplasmic reticulum membrane
IBA
GO_REF:0000033
ACCEPT
Summary: Phylogenetically inferred ER membrane localization, consistent with the experimentally demonstrated ER membrane localization of human dolichol kinase and its yeast ortholog SEC59.
Reason: DOLK is an experimentally validated polytopic ER membrane protein (PMID:16923818), so the IBA localization is correct and represents a core aspect of where the enzyme acts.
Supporting Evidence:
PMID:16923818
shown to be a polytopic membrane protein localized in the endoplasmic reticulum with an N terminus extended into the lumen and a cytoplasmically oriented C terminus.
GO:0004168 dolichol kinase activity
IBA
GO_REF:0000033
ACCEPT
Summary: Phylogenetically inferred dolichol kinase activity, the defining and experimentally established molecular function of DOLK.
Reason: This is the core molecular function of the gene, directly demonstrated biochemically (PMID:12213788, PMID:16923818) and by disease-variant enzyme assays (PMID:17273964, PMID:22242004). GOA carries this exact current term (GO:0004168, EC 2.7.1.108).
Supporting Evidence:
PMID:12213788
Dolichol kinase (DK) catalyzes the CTP-mediated phosphorylation of dolichol in eukaryotic cells, the terminal step in dolichyl monophosphate (Dol-P) biosynthesis de novo.
GO:0043048 dolichyl monophosphate biosynthetic process
IBA
GO_REF:0000033
ACCEPT
Summary: Phylogenetically inferred involvement in dolichyl monophosphate (Dol-P) biosynthesis, the pathway output of the dolichol kinase reaction.
Reason: Dol-P biosynthesis is the direct biological process to which the DOLK reaction contributes; this is well supported experimentally and the IBA is at an appropriate level of specificity.
Supporting Evidence:
PMID:12213788
the terminal step in dolichyl monophosphate (Dol-P) biosynthesis de novo.
GO:0004168 dolichol kinase activity
IEA
GO_REF:0000120
ACCEPT
Summary: Automated annotation of dolichol kinase activity from the RHEA/EC mapping (RHEA:13133, EC 2.7.1.108).
Reason: The EC/RHEA mapping is exactly correct for DOLK and matches the experimentally established catalytic activity. The reaction is documented in UniProt.
Supporting Evidence:
file:human/DOLK/DOLK-uniprot.txt
Reaction=a di-trans,poly-cis-dolichol + CTP = a di-trans,poly-cis-
GO:0005789 endoplasmic reticulum membrane
IEA
GO_REF:0000044
ACCEPT
Summary: Automated ER membrane localization from the UniProt subcellular-location keyword mapping, consistent with experimental data.
Reason: DOLK is an experimentally confirmed integral ER membrane protein; the SubCell mapping is accurate.
Supporting Evidence:
file:human/DOLK/DOLK-uniprot.txt
SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
GO:0005515 protein binding
IPI
PMID:25416956
A proteome-scale map of the human interactome network.
MARK AS OVER ANNOTATED
Summary: Interactor identified in a proteome-scale binary interactome map. The generic "protein binding" term is uninformative about DOLK's actual molecular function.
Reason: This annotation comes from a large-scale high-throughput interactome screen and only asserts the uninformative term GO:0005515 protein binding. Per curation guidelines this term should not be treated as core function; the physiologically meaningful function is dolichol kinase activity. Retained as an experimental IPI rather than removed.
Supporting Evidence:
PMID:25416956
A proteome-scale map of the human interactome network.
GO:0005515 protein binding
IPI
PMID:26871637
Widespread Expansion of Protein Interaction Capabilities by ...
MARK AS OVER ANNOTATED
Summary: Interactor reported in a large-scale alternative-splicing interactome study; the term is uninformative for DOLK function.
Reason: High-throughput protein-protein interaction annotation using the generic GO:0005515 term. It does not inform the molecular function of DOLK and is not a core annotation. Retained as an experimental IPI.
Supporting Evidence:
PMID:26871637
Widespread Expansion of Protein Interaction Capabilities by Alternative Splicing.
GO:0005515 protein binding
IPI
PMID:28514442
Architecture of the human interactome defines protein commun...
MARK AS OVER ANNOTATED
Summary: Interactors reported in a large-scale interactome map (e.g. KCNA6, LRRC4C); the generic term is uninformative for DOLK function.
Reason: High-throughput interactome annotation using the uninformative GO:0005515 term. DOLK's interactors here are largely co-resident ER membrane proteins and the binding data do not establish a specific molecular function. Retained as an experimental IPI.
Supporting Evidence:
PMID:28514442
Architecture of the human interactome defines protein communities and disease networks.
GO:0005515 protein binding
IPI
PMID:32296183
A reference map of the human binary protein interactome.
MARK AS OVER ANNOTATED
Summary: Multiple interactors reported in the HuRI binary interactome map; the generic term is uninformative for DOLK function.
Reason: High-throughput binary interactome annotation using the uninformative GO:0005515 term. The many interactors (largely ER/membrane proteins) do not define a specific molecular function for DOLK. Retained as an experimental IPI.
Supporting Evidence:
PMID:32296183
A reference map of the human binary protein interactome.
GO:0005515 protein binding
IPI
PMID:33961781
Dual proteome-scale networks reveal cell-specific remodeling...
MARK AS OVER ANNOTATED
Summary: Interactors reported in a proteome-scale AP-MS network study; the generic term is uninformative for DOLK function.
Reason: High-throughput proteome-scale interaction annotation using the uninformative GO:0005515 term. Does not inform DOLK molecular function and is not core. Retained as an experimental IPI.
Supporting Evidence:
PMID:33961781
Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.
GO:0043048 dolichyl monophosphate biosynthetic process
TAS
Reactome:R-HSA-446199
ACCEPT
Summary: Reactome-asserted involvement in dolichyl phosphate synthesis, matching the enzyme's pathway role.
Reason: DOLK catalyzes the terminal step producing Dol-P; the Reactome pathway "Synthesis of dolichyl-phosphate" correctly captures this biological process.
Supporting Evidence:
PMID:12213788
the terminal step in dolichyl monophosphate (Dol-P) biosynthesis de novo.
GO:0004168 dolichol kinase activity
TAS
Reactome:R-HSA-446195
ACCEPT
Summary: Reactome-asserted dolichol kinase activity (DOLK phosphorylates dolichol to Dol-P), matching the core molecular function.
Reason: Correct assignment of the enzyme's defining catalytic activity, corroborated by biochemical assays.
Supporting Evidence:
PMID:16923818
Human dolichol kinase, a polytopic endoplasmic reticulum membrane protein with a cytoplasmically oriented CTP-binding site.
GO:0004168 dolichol kinase activity
TAS
Reactome:R-HSA-4755600
ACCEPT
Summary: Reactome-asserted dolichol kinase activity (disease-annotated reaction), matching the core molecular function.
Reason: Correct assignment of the defining catalytic activity of DOLK.
Supporting Evidence:
PMID:16923818
Human dolichol kinase, a polytopic endoplasmic reticulum membrane protein with a cytoplasmically oriented CTP-binding site.
GO:0005730 nucleolus
IDA
GO_REF:0000052
MARK AS OVER ANNOTATED
Summary: Single high-throughput immunofluorescence (HPA) annotation to the nucleolus, inconsistent with the well-established integral ER membrane localization of this polytopic membrane kinase.
Reason: DOLK is a ~15-pass integral ER membrane protein (PMID:16923818); a nucleolar localization is biologically implausible for its function and is contradicted by IDA, IBA, IEA and Reactome ER membrane annotations. This is most likely background/off-target signal in the HPA immunofluorescence screen. Not removed (single experimental IF datum) but flagged as over-annotation.
Supporting Evidence:
PMID:16923818
shown to be a polytopic membrane protein localized in the endoplasmic reticulum with an N terminus extended into the lumen and a cytoplasmically oriented C terminus.
GO:0043048 dolichyl monophosphate biosynthetic process
IGI
PMID:12213788
Expression and characterization of a human cDNA that complem...
ACCEPT
Summary: Genetic interaction evidence: human DOLK (hDK1) complements the yeast sec59-1 (SEC59/dolichol kinase) mutant, restoring dolichol kinase activity, Dol-P levels and N-glycosylation, establishing its role in Dol-P biosynthesis.
Reason: Cross-species complementation (with yeast SEC59, UniProtKB:P20048) demonstrates DOLK functions in de novo Dol-P biosynthesis. This is a well-supported core biological process annotation.
Supporting Evidence:
PMID:12213788
hDK1 is capable of complementing the growth defect, elevating DK activity, and consequently increasing Dol-P levels in vivo and restoring normal N-glycosylation of carboxypeptidase Y at the restrictive temperature in the temperature-sensitive mutant sec59-1.
GO:0004168 dolichol kinase activity
EXP
PMID:17273964
A defect in dolichol phosphate biosynthesis causes a new inh...
ACCEPT
Summary: Experimental demonstration of dolichol kinase activity via disease-variant characterization: CDG1M variants Cys99Ser and Tyr441Ser have only 2-4% residual DK activity.
Reason: Direct experimental measurement of the enzyme's catalytic activity in patient cells and by yeast complementation; core molecular function.
Supporting Evidence:
PMID:17273964
The residual activity of mutant DK1 was 2%-4% when compared with control cells.
GO:0004168 dolichol kinase activity
IMP
PMID:22242004
Autosomal recessive dilated cardiomyopathy due to DOLK mutat...
ACCEPT
Summary: Mutant-phenotype evidence: pathogenic DOLK mutations cause a dolichol kinase deficiency confirmed by enzyme analysis in patient fibroblasts.
Reason: Loss of catalytic activity upon mutation directly supports the dolichol kinase molecular function of DOLK; core.
Supporting Evidence:
PMID:22242004
Enzyme analysis in patients' fibroblasts confirmed a dolichol kinase deficiency in all families.
GO:0043048 dolichyl monophosphate biosynthetic process
IMP
PMID:22242004
Autosomal recessive dilated cardiomyopathy due to DOLK mutat...
ACCEPT
Summary: Mutant-phenotype evidence that DOLK is required for dolichol-phosphate formation; DOLK mutations abolish dolichol kinase activity and downstream glycosylation.
Reason: DOLK mutations cause deficient formation of dolichol-phosphate and impaired N-glycosylation / O-mannosylation, supporting its role in Dol-P biosynthesis. Core biological process.
Supporting Evidence:
PMID:22242004
pathogenic mutations were identified in DOLK, encoding the dolichol kinase responsible for formation of dolichol-phosphate.
GO:0005789 endoplasmic reticulum membrane
TAS
Reactome:R-HSA-4755600
ACCEPT
Summary: Reactome-asserted ER membrane localization, consistent with experimental data.
Reason: Correct; matches the experimentally established ER membrane localization of DOLK.
Supporting Evidence:
PMID:16923818
localized in the endoplasmic reticulum
GO:0005789 endoplasmic reticulum membrane
TAS
Reactome:R-HSA-446195
ACCEPT
Summary: Reactome-asserted ER membrane localization, consistent with experimental data.
Reason: Correct; matches the experimentally established ER membrane localization of DOLK.
Supporting Evidence:
PMID:16923818
localized in the endoplasmic reticulum
GO:0004168 dolichol kinase activity
IDA
PMID:12213788
Expression and characterization of a human cDNA that complem...
ACCEPT
Summary: Direct assay evidence: overexpression of human DOLK (hDK1) increased dolichol kinase activity ~15-fold in microsomes and complemented the yeast DK-deficient mutant.
Reason: Biochemical demonstration of the enzyme's catalytic activity; the defining and core molecular function.
Supporting Evidence:
PMID:12213788
overexpression of hDK1p in Sf-9 cells resulted in a 15-fold increase in DK activity but not DAG kinase activity in crude microsomal fractions.
GO:0004168 dolichol kinase activity
IDA
PMID:16923818
Human dolichol kinase, a polytopic endoplasmic reticulum mem...
ACCEPT
Summary: Direct assay evidence with mapping of the CTP-binding site and kinetics (KM 22.8 uM dolichol; 3.5 uM CTP); G443D abolishes activity.
Reason: Detailed biochemical characterization of DOLK's dolichol kinase activity; core molecular function.
Supporting Evidence:
file:human/DOLK/DOLK-uniprot.txt
KM=22.8 uM for dolichol {ECO:0000269|PubMed:16923818};
GO:0043048 dolichyl monophosphate biosynthetic process
IDA
PMID:12213788
Expression and characterization of a human cDNA that complem...
ACCEPT
Summary: Direct evidence that DOLK produces Dol-P: expression elevates DK activity and increases in vivo Dol-P levels, restoring N-glycosylation.
Reason: DOLK catalyzes the terminal step of Dol-P biosynthesis; increased Dol-P upon expression directly supports this process. Core.
Supporting Evidence:
PMID:12213788
elevating DK activity, and consequently increasing Dol-P levels in vivo
GO:0043048 dolichyl monophosphate biosynthetic process
IDA
PMID:16923818
Human dolichol kinase, a polytopic endoplasmic reticulum mem...
ACCEPT
Summary: Direct evidence linking DOLK catalytic activity to dolichyl monophosphate biosynthesis, with functional mapping of catalytic residues.
Reason: DOLK catalyzes CTP-dependent dolichol phosphorylation, the terminal step of Dol-P biosynthesis; mutations abolishing activity confirm the requirement. Core.
Supporting Evidence:
PMID:16923818
Dolichol kinase (DK) catalyzes the CTP-dependent phosphorylation of dolichol in the biosynthesis de novo and possibly the recycling of dolichyl monophosphate
GO:0005789 endoplasmic reticulum membrane
IDA
PMID:16923818
Human dolichol kinase, a polytopic endoplasmic reticulum mem...
ACCEPT
Summary: Direct assay evidence that human DOLK is a polytopic ER membrane protein, from overexpression and topology mapping in CHO cells.
Reason: Experimentally demonstrated ER membrane localization by the primary characterization paper; this is the core location where DOLK acts.
Supporting Evidence:
PMID:16923818
shown to be a polytopic membrane protein localized in the endoplasmic reticulum with an N terminus extended into the lumen and a cytoplasmically oriented C terminus.
GO:0006488 dolichol-linked oligosaccharide biosynthetic process
IGI
PMID:12213788
Expression and characterization of a human cDNA that complem...
NEW
Summary: Proposed annotation capturing DOLK's role in supplying Dol-P for assembly of the dolichol-linked oligosaccharide (LLO) used in N-glycosylation. DOLK complementation of the yeast dolichol kinase mutant restores N-glycosylation, demonstrating this downstream involvement.
Reason: The existing GOA BP annotations stop at dolichyl monophosphate biosynthesis (GO:0043048). DOLK is upstream of, and required for, LLO assembly for protein N-linked glycosylation; adding GO:0006488 records this downstream biological role explicitly, supported by rescue of N-glycosylation in the yeast complementation assay.
Supporting Evidence:
PMID:12213788
restoring normal N-glycosylation of carboxypeptidase Y at the restrictive temperature in the temperature-sensitive mutant sec59-1.

Core Functions

CTP-dependent dolichol kinase activity: phosphorylates dolichol to dolichyl monophosphate (Dol-P) at the ER membrane, the terminal step of de novo Dol-P biosynthesis (EC 2.7.1.108).

Supporting Evidence:
  • PMID:16923818
    Dolichol kinase (DK) catalyzes the CTP-dependent phosphorylation of dolichol in the biosynthesis de novo and possibly the recycling of dolichyl monophosphate

Supplies dolichyl monophosphate, the activated lipid carrier that primes assembly of the dolichol-linked oligosaccharide for protein N-linked glycosylation (and is also required for O-/C-mannosylation and GPI-anchor biosynthesis).

Supporting Evidence:
  • PMID:12213788
    restoring normal N-glycosylation of carboxypeptidase Y at the restrictive temperature in the temperature-sensitive mutant sec59-1.

References

Annotation inferences using phylogenetic trees
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt
Gene Ontology annotation based on curation of immunofluorescence data
Combined Automated Annotation using Multiple IEA Methods
file:human/DOLK/DOLK-uniprot.txt
UniProtKB entry DOLK_HUMAN (Q9UPQ8)
Expression and characterization of a human cDNA that complements the temperature-sensitive defect in dolichol kinase activity in the yeast sec59-1 mutant: the enzymatic phosphorylation of dolichol and diacylglycerol are catalyzed by separate CTP-mediated kinase activities in Saccharomyces cerevisiae.
Human dolichol kinase, a polytopic endoplasmic reticulum membrane protein with a cytoplasmically oriented CTP-binding site.
A defect in dolichol phosphate biosynthesis causes a new inherited disorder with death in early infancy.
Autosomal recessive dilated cardiomyopathy due to DOLK mutations results from abnormal dystroglycan O-mannosylation.
A proteome-scale map of the human interactome network.
Widespread Expansion of Protein Interaction Capabilities by Alternative Splicing.
Architecture of the human interactome defines protein communities and disease networks.
A reference map of the human binary protein interactome.
Dual proteome-scale networks reveal cell-specific remodeling of the human interactome.
Reactome:R-HSA-446195
DOLK phosphorylates DCHOL to DOLP
Reactome:R-HSA-446199
Synthesis of dolichyl-phosphate
Reactome:R-HSA-4755600
Defective DOLK does not phosphorylate DCHOL

Suggested Questions for Experts

Q: Does DOLK activity contribute to Dol-P recycling in addition to de novo synthesis, and how is this partitioned in vivo?

Q: Why do some DOLK-CDG patients present predominantly with dilated cardiomyopathy (via alpha-dystroglycan O-mannosylation) while others show multisystem or purely neurological disease?

Suggested Experiments

Experiment: Tissue-specific conditional Dolk knockout in mouse heart to test whether dilated cardiomyopathy arises specifically from reduced alpha-dystroglycan O-mannosylation.

Experiment: Structure determination (cryo-EM) of human DOLK to define the dolichol- and CTP-binding pockets and rationalize CDG1M variant effects.

📚 Additional Documentation

Notes

(DOLK-notes.md)

DOLK (dolichol kinase, Q9UPQ8) — review notes

Summary of function

DOLK catalyses the CTP-dependent phosphorylation of dolichol to dolichyl monophosphate
(Dol-P), the terminal step of de novo Dol-P biosynthesis at the ER membrane. Dol-P is the
essential lipid carrier that primes dolichol-linked oligosaccharide (LLO) assembly for
protein N-glycosylation and is also required for O-mannosylation, C-mannosylation and
GPI-anchor biosynthesis.

  • EC 2.7.1.108; RHEA:13133 (di-trans,poly-cis-dolichol + CTP = di-trans,poly-cis-dolichyl
    phosphate + CDP + H+).
  • Polytopic ER membrane protein (~15 TM helices), cytoplasmically oriented CTP-binding site
    (loop between TMD11-12, (470)KKTXEG(475) motif). PMID:16923818
  • KM 22.8 uM dolichol, 3.5 uM CTP. [PMID:16923818, UniProt]
  • Belongs to the polyprenol kinase family; InterPro IPR032974; PANTHER PTHR13205:SF15.

Key experimental evidence

  • PMID:12213788 Human cDNA (hDK1) complements yeast sec59-1 ts defect in DK activity;
    elevates DK activity, increases Dol-P, restores N-glycosylation of carboxypeptidase Y.
    Dolichol and DAG phosphorylation are separate CTP-mediated kinase activities.
    "Dolichol kinase (DK) catalyzes the CTP-mediated phosphorylation of dolichol in eukaryotic
    cells, the terminal step in dolichyl monophosphate (Dol-P) biosynthesis de novo." GOA
    attaches IGI (with yeast SEC59 P20048) + IDA to this paper.
  • PMID:16923818 Overexpression in CHO; polytopic ER membrane protein; CTP-binding site
    mapped; G443D inactivates. IDA for MF and located_in ER membrane.
  • PMID:17273964 DOLK-CDG (CDG1M / DK1 deficiency); Cys99Ser, Tyr441Ser variants with
    2-4% residual activity; death in early infancy; two patients died of dilative
    cardiomyopathy. Dol-P "involved in several glycosylation reactions, such as
    N-glycosylation, glycosylphosphatidylinositol (GPI)-anchor biosynthesis, and C- and
    O-mannosylation." EXP for MF.
  • PMID:22242004 Autosomal recessive dilated cardiomyopathy from DOLK mutations; DK
    deficiency confirmed in patient fibroblasts; reduced alpha-dystroglycan O-mannosylation.
    IMP for MF and BP.
  • PMID:23890587 purely neurological DOLK-CDG (UniProt disease ref; not in GOA lines).
  • PMID:28816422 two new DOLK-CDG cases, phenotype expansion (UniProt; not in GOA).

Interactome / protein binding IPIs

IntAct GO:0005515 protein binding annotations derive from large-scale binary interactome /
AP-MS maps (PMID:25416956, 26871637, 28514442, 32296183, 33961781). Interactors are largely
co-ER membrane proteins (ion channels KCNA1/3/6/10, CD79A, GPX8, EDA, etc.). None establish a
specific molecular function for DOLK; per curation policy protein binding is uninformative
and these are MARK_AS_OVER_ANNOTATED (not REMOVE — experimental IPIs).

Localization

  • ER membrane: IDA (PMID:16923818), IBA, IEA (SubCell), Reactome TAS — all consistent. Core.
  • Nucleolus: single HPA IDA (GO_REF:0000052). Inconsistent with an integral polytopic ER
    membrane kinase; HPA IF can give background nucleolar signal. MARK_AS_OVER_ANNOTATED.

Term decisions

  • MF: GO:0004168 dolichol kinase activity — GOA current term, EC 2.7.1.108. Core. ACCEPT all
    (IBA, IEA/RHEA, EXP, IMP, IDA, Reactome TAS).
  • BP: GO:0043048 dolichyl monophosphate biosynthetic process — direct product of the reaction.
    Core. ACCEPT all. (Also relevant: GO:0006488 dolichol-linked oligosaccharide biosynthetic
    process for the downstream N-glycosylation role — used in core_functions.)
  • CC: GO:0005789 ER membrane — Core. ACCEPT.

📄 View Raw YAML

id: Q9UPQ8
gene_symbol: DOLK
product_type: PROTEIN
status: INITIALIZED
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  DOLK is dolichol kinase, a polytopic endoplasmic reticulum membrane enzyme that
  catalyzes the CTP-dependent phosphorylation of dolichol to dolichyl monophosphate
  (Dol-P), the terminal step in de novo Dol-P biosynthesis (EC 2.7.1.108). Dol-P is
  the essential lipid carrier that primes assembly of the dolichol-linked
  oligosaccharide for protein N-linked glycosylation and is also required for
  O-mannosylation, C-mannosylation and GPI-anchor biosynthesis, so DOLK supplies the
  activated lipid carrier used throughout the glycosylation system. The enzyme has a
  cytoplasmically oriented CTP-binding site and belongs to the polyprenol kinase
  family. Loss-of-function mutations cause DOLK-CDG (congenital disorder of
  glycosylation type Im), whose features include dilated cardiomyopathy (linked to
  deficient alpha-dystroglycan O-mannosylation), ichthyosis and neurological disease.
existing_annotations:
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: is_active_in
  review:
    summary: >-
      Phylogenetically inferred ER membrane localization, consistent with the
      experimentally demonstrated ER membrane localization of human dolichol kinase
      and its yeast ortholog SEC59.
    action: ACCEPT
    reason: >-
      DOLK is an experimentally validated polytopic ER membrane protein (PMID:16923818),
      so the IBA localization is correct and represents a core aspect of where the
      enzyme acts.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        shown to be a polytopic membrane protein localized in the endoplasmic
        reticulum with an N terminus extended into the lumen and a cytoplasmically
        oriented C terminus.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: enables
  review:
    summary: >-
      Phylogenetically inferred dolichol kinase activity, the defining and
      experimentally established molecular function of DOLK.
    action: ACCEPT
    reason: >-
      This is the core molecular function of the gene, directly demonstrated
      biochemically (PMID:12213788, PMID:16923818) and by disease-variant enzyme
      assays (PMID:17273964, PMID:22242004). GOA carries this exact current term
      (GO:0004168, EC 2.7.1.108).
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        Dolichol kinase (DK) catalyzes the CTP-mediated phosphorylation of dolichol
        in eukaryotic cells, the terminal step in dolichyl monophosphate (Dol-P)
        biosynthesis de novo.
- term:
    id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  qualifier: involved_in
  review:
    summary: >-
      Phylogenetically inferred involvement in dolichyl monophosphate (Dol-P)
      biosynthesis, the pathway output of the dolichol kinase reaction.
    action: ACCEPT
    reason: >-
      Dol-P biosynthesis is the direct biological process to which the DOLK reaction
      contributes; this is well supported experimentally and the IBA is at an
      appropriate level of specificity.
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        the terminal step in dolichyl monophosphate (Dol-P) biosynthesis de novo.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  qualifier: enables
  review:
    summary: >-
      Automated annotation of dolichol kinase activity from the RHEA/EC mapping
      (RHEA:13133, EC 2.7.1.108).
    action: ACCEPT
    reason: >-
      The EC/RHEA mapping is exactly correct for DOLK and matches the experimentally
      established catalytic activity. The reaction is documented in UniProt.
    supported_by:
    - reference_id: file:human/DOLK/DOLK-uniprot.txt
      supporting_text: >-
        Reaction=a di-trans,poly-cis-dolichol + CTP = a di-trans,poly-cis-
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  qualifier: located_in
  review:
    summary: >-
      Automated ER membrane localization from the UniProt subcellular-location
      keyword mapping, consistent with experimental data.
    action: ACCEPT
    reason: >-
      DOLK is an experimentally confirmed integral ER membrane protein; the SubCell
      mapping is accurate.
    supported_by:
    - reference_id: file:human/DOLK/DOLK-uniprot.txt
      supporting_text: >-
        SUBCELLULAR LOCATION: Endoplasmic reticulum membrane
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:25416956
  qualifier: enables
  review:
    summary: >-
      Interactor identified in a proteome-scale binary interactome map. The generic
      "protein binding" term is uninformative about DOLK's actual molecular function.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      This annotation comes from a large-scale high-throughput interactome screen and
      only asserts the uninformative term GO:0005515 protein binding. Per curation
      guidelines this term should not be treated as core function; the physiologically
      meaningful function is dolichol kinase activity. Retained as an experimental IPI
      rather than removed.
    supported_by:
    - reference_id: PMID:25416956
      supporting_text: A proteome-scale map of the human interactome network.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:26871637
  qualifier: enables
  review:
    summary: >-
      Interactor reported in a large-scale alternative-splicing interactome study;
      the term is uninformative for DOLK function.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      High-throughput protein-protein interaction annotation using the generic
      GO:0005515 term. It does not inform the molecular function of DOLK and is not a
      core annotation. Retained as an experimental IPI.
    supported_by:
    - reference_id: PMID:26871637
      supporting_text: >-
        Widespread Expansion of Protein Interaction Capabilities by Alternative
        Splicing.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:28514442
  qualifier: enables
  review:
    summary: >-
      Interactors reported in a large-scale interactome map (e.g. KCNA6, LRRC4C);
      the generic term is uninformative for DOLK function.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      High-throughput interactome annotation using the uninformative GO:0005515 term.
      DOLK's interactors here are largely co-resident ER membrane proteins and the
      binding data do not establish a specific molecular function. Retained as an
      experimental IPI.
    supported_by:
    - reference_id: PMID:28514442
      supporting_text: >-
        Architecture of the human interactome defines protein communities and disease
        networks.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:32296183
  qualifier: enables
  review:
    summary: >-
      Multiple interactors reported in the HuRI binary interactome map; the generic
      term is uninformative for DOLK function.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      High-throughput binary interactome annotation using the uninformative GO:0005515
      term. The many interactors (largely ER/membrane proteins) do not define a
      specific molecular function for DOLK. Retained as an experimental IPI.
    supported_by:
    - reference_id: PMID:32296183
      supporting_text: A reference map of the human binary protein interactome.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:33961781
  qualifier: enables
  review:
    summary: >-
      Interactors reported in a proteome-scale AP-MS network study; the generic term
      is uninformative for DOLK function.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      High-throughput proteome-scale interaction annotation using the uninformative
      GO:0005515 term. Does not inform DOLK molecular function and is not core.
      Retained as an experimental IPI.
    supported_by:
    - reference_id: PMID:33961781
      supporting_text: >-
        Dual proteome-scale networks reveal cell-specific remodeling of the human
        interactome.
- term:
    id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-446199
  qualifier: involved_in
  review:
    summary: >-
      Reactome-asserted involvement in dolichyl phosphate synthesis, matching the
      enzyme's pathway role.
    action: ACCEPT
    reason: >-
      DOLK catalyzes the terminal step producing Dol-P; the Reactome pathway
      "Synthesis of dolichyl-phosphate" correctly captures this biological process.
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        the terminal step in dolichyl monophosphate (Dol-P) biosynthesis de novo.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-446195
  qualifier: enables
  review:
    summary: >-
      Reactome-asserted dolichol kinase activity (DOLK phosphorylates dolichol to
      Dol-P), matching the core molecular function.
    action: ACCEPT
    reason: >-
      Correct assignment of the enzyme's defining catalytic activity, corroborated by
      biochemical assays.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        Human dolichol kinase, a polytopic endoplasmic reticulum membrane protein with
        a cytoplasmically oriented CTP-binding site.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-4755600
  qualifier: enables
  review:
    summary: >-
      Reactome-asserted dolichol kinase activity (disease-annotated reaction),
      matching the core molecular function.
    action: ACCEPT
    reason: >-
      Correct assignment of the defining catalytic activity of DOLK.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        Human dolichol kinase, a polytopic endoplasmic reticulum membrane protein with
        a cytoplasmically oriented CTP-binding site.
- term:
    id: GO:0005730
    label: nucleolus
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  qualifier: located_in
  review:
    summary: >-
      Single high-throughput immunofluorescence (HPA) annotation to the nucleolus,
      inconsistent with the well-established integral ER membrane localization of this
      polytopic membrane kinase.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      DOLK is a ~15-pass integral ER membrane protein (PMID:16923818); a nucleolar
      localization is biologically implausible for its function and is contradicted by
      IDA, IBA, IEA and Reactome ER membrane annotations. This is most likely
      background/off-target signal in the HPA immunofluorescence screen. Not removed
      (single experimental IF datum) but flagged as over-annotation.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        shown to be a polytopic membrane protein localized in the endoplasmic
        reticulum with an N terminus extended into the lumen and a cytoplasmically
        oriented C terminus.
- term:
    id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  evidence_type: IGI
  original_reference_id: PMID:12213788
  qualifier: involved_in
  review:
    summary: >-
      Genetic interaction evidence: human DOLK (hDK1) complements the yeast sec59-1
      (SEC59/dolichol kinase) mutant, restoring dolichol kinase activity, Dol-P levels
      and N-glycosylation, establishing its role in Dol-P biosynthesis.
    action: ACCEPT
    reason: >-
      Cross-species complementation (with yeast SEC59, UniProtKB:P20048) demonstrates
      DOLK functions in de novo Dol-P biosynthesis. This is a well-supported core
      biological process annotation.
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        hDK1 is capable of complementing the growth defect, elevating DK activity, and
        consequently increasing Dol-P levels in vivo and restoring normal
        N-glycosylation of carboxypeptidase Y at the restrictive temperature in the
        temperature-sensitive mutant sec59-1.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: EXP
  original_reference_id: PMID:17273964
  qualifier: enables
  review:
    summary: >-
      Experimental demonstration of dolichol kinase activity via disease-variant
      characterization: CDG1M variants Cys99Ser and Tyr441Ser have only 2-4% residual
      DK activity.
    action: ACCEPT
    reason: >-
      Direct experimental measurement of the enzyme's catalytic activity in patient
      cells and by yeast complementation; core molecular function.
    supported_by:
    - reference_id: PMID:17273964
      supporting_text: >-
        The residual activity of mutant DK1 was 2%-4% when compared with control cells.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: IMP
  original_reference_id: PMID:22242004
  qualifier: enables
  review:
    summary: >-
      Mutant-phenotype evidence: pathogenic DOLK mutations cause a dolichol kinase
      deficiency confirmed by enzyme analysis in patient fibroblasts.
    action: ACCEPT
    reason: >-
      Loss of catalytic activity upon mutation directly supports the dolichol kinase
      molecular function of DOLK; core.
    supported_by:
    - reference_id: PMID:22242004
      supporting_text: >-
        Enzyme analysis in patients' fibroblasts confirmed a dolichol kinase
        deficiency in all families.
- term:
    id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  evidence_type: IMP
  original_reference_id: PMID:22242004
  qualifier: involved_in
  review:
    summary: >-
      Mutant-phenotype evidence that DOLK is required for dolichol-phosphate formation;
      DOLK mutations abolish dolichol kinase activity and downstream glycosylation.
    action: ACCEPT
    reason: >-
      DOLK mutations cause deficient formation of dolichol-phosphate and impaired
      N-glycosylation / O-mannosylation, supporting its role in Dol-P biosynthesis.
      Core biological process.
    supported_by:
    - reference_id: PMID:22242004
      supporting_text: >-
        pathogenic mutations were identified in DOLK, encoding the dolichol kinase
        responsible for formation of dolichol-phosphate.
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-4755600
  qualifier: located_in
  review:
    summary: >-
      Reactome-asserted ER membrane localization, consistent with experimental data.
    action: ACCEPT
    reason: >-
      Correct; matches the experimentally established ER membrane localization of DOLK.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        localized in the endoplasmic reticulum
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-446195
  qualifier: located_in
  review:
    summary: >-
      Reactome-asserted ER membrane localization, consistent with experimental data.
    action: ACCEPT
    reason: >-
      Correct; matches the experimentally established ER membrane localization of DOLK.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        localized in the endoplasmic reticulum
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: IDA
  original_reference_id: PMID:12213788
  qualifier: enables
  review:
    summary: >-
      Direct assay evidence: overexpression of human DOLK (hDK1) increased dolichol
      kinase activity ~15-fold in microsomes and complemented the yeast DK-deficient
      mutant.
    action: ACCEPT
    reason: >-
      Biochemical demonstration of the enzyme's catalytic activity; the defining and
      core molecular function.
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        overexpression of hDK1p in Sf-9 cells resulted in a 15-fold increase in DK
        activity but not DAG kinase activity in crude microsomal fractions.
- term:
    id: GO:0004168
    label: dolichol kinase activity
  evidence_type: IDA
  original_reference_id: PMID:16923818
  qualifier: enables
  review:
    summary: >-
      Direct assay evidence with mapping of the CTP-binding site and kinetics
      (KM 22.8 uM dolichol; 3.5 uM CTP); G443D abolishes activity.
    action: ACCEPT
    reason: >-
      Detailed biochemical characterization of DOLK's dolichol kinase activity; core
      molecular function.
    supported_by:
    - reference_id: file:human/DOLK/DOLK-uniprot.txt
      supporting_text: >-
        KM=22.8 uM for dolichol {ECO:0000269|PubMed:16923818};
- term:
    id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  evidence_type: IDA
  original_reference_id: PMID:12213788
  qualifier: involved_in
  review:
    summary: >-
      Direct evidence that DOLK produces Dol-P: expression elevates DK activity and
      increases in vivo Dol-P levels, restoring N-glycosylation.
    action: ACCEPT
    reason: >-
      DOLK catalyzes the terminal step of Dol-P biosynthesis; increased Dol-P upon
      expression directly supports this process. Core.
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        elevating DK activity, and consequently increasing Dol-P levels in vivo
- term:
    id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  evidence_type: IDA
  original_reference_id: PMID:16923818
  qualifier: involved_in
  review:
    summary: >-
      Direct evidence linking DOLK catalytic activity to dolichyl monophosphate
      biosynthesis, with functional mapping of catalytic residues.
    action: ACCEPT
    reason: >-
      DOLK catalyzes CTP-dependent dolichol phosphorylation, the terminal step of
      Dol-P biosynthesis; mutations abolishing activity confirm the requirement. Core.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        Dolichol kinase (DK) catalyzes the CTP-dependent phosphorylation of dolichol
        in the biosynthesis de novo and possibly the recycling of dolichyl
        monophosphate
- term:
    id: GO:0005789
    label: endoplasmic reticulum membrane
  evidence_type: IDA
  original_reference_id: PMID:16923818
  qualifier: located_in
  review:
    summary: >-
      Direct assay evidence that human DOLK is a polytopic ER membrane protein, from
      overexpression and topology mapping in CHO cells.
    action: ACCEPT
    reason: >-
      Experimentally demonstrated ER membrane localization by the primary
      characterization paper; this is the core location where DOLK acts.
    supported_by:
    - reference_id: PMID:16923818
      supporting_text: >-
        shown to be a polytopic membrane protein localized in the endoplasmic
        reticulum with an N terminus extended into the lumen and a cytoplasmically
        oriented C terminus.
- term:
    id: GO:0006488
    label: dolichol-linked oligosaccharide biosynthetic process
  evidence_type: IGI
  original_reference_id: PMID:12213788
  qualifier: involved_in
  review:
    summary: >-
      Proposed annotation capturing DOLK's role in supplying Dol-P for assembly of
      the dolichol-linked oligosaccharide (LLO) used in N-glycosylation. DOLK
      complementation of the yeast dolichol kinase mutant restores N-glycosylation,
      demonstrating this downstream involvement.
    action: NEW
    reason: >-
      The existing GOA BP annotations stop at dolichyl monophosphate biosynthesis
      (GO:0043048). DOLK is upstream of, and required for, LLO assembly for protein
      N-linked glycosylation; adding GO:0006488 records this downstream biological
      role explicitly, supported by rescue of N-glycosylation in the yeast
      complementation assay.
    supported_by:
    - reference_id: PMID:12213788
      supporting_text: >-
        restoring normal N-glycosylation of carboxypeptidase Y at the restrictive
        temperature in the temperature-sensitive mutant sec59-1.
core_functions:
- description: >-
    CTP-dependent dolichol kinase activity: phosphorylates dolichol to dolichyl
    monophosphate (Dol-P) at the ER membrane, the terminal step of de novo Dol-P
    biosynthesis (EC 2.7.1.108).
  molecular_function:
    id: GO:0004168
    label: dolichol kinase activity
  directly_involved_in:
  - id: GO:0043048
    label: dolichyl monophosphate biosynthetic process
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: PMID:16923818
    supporting_text: >-
      Dolichol kinase (DK) catalyzes the CTP-dependent phosphorylation of dolichol
      in the biosynthesis de novo and possibly the recycling of dolichyl
      monophosphate
- description: >-
    Supplies dolichyl monophosphate, the activated lipid carrier that primes assembly
    of the dolichol-linked oligosaccharide for protein N-linked glycosylation (and is
    also required for O-/C-mannosylation and GPI-anchor biosynthesis).
  molecular_function:
    id: GO:0004168
    label: dolichol kinase activity
  directly_involved_in:
  - id: GO:0006488
    label: dolichol-linked oligosaccharide biosynthetic process
  locations:
  - id: GO:0005789
    label: endoplasmic reticulum membrane
  supported_by:
  - reference_id: PMID:12213788
    supporting_text: >-
      restoring normal N-glycosylation of carboxypeptidase Y at the restrictive
      temperature in the temperature-sensitive mutant sec59-1.
proposed_new_terms: []
suggested_questions:
- question: >-
    Does DOLK activity contribute to Dol-P recycling in addition to de novo synthesis,
    and how is this partitioned in vivo?
- question: >-
    Why do some DOLK-CDG patients present predominantly with dilated cardiomyopathy
    (via alpha-dystroglycan O-mannosylation) while others show multisystem or purely
    neurological disease?
suggested_experiments:
- description: >-
    Tissue-specific conditional Dolk knockout in mouse heart to test whether dilated
    cardiomyopathy arises specifically from reduced alpha-dystroglycan O-mannosylation.
- description: >-
    Structure determination (cryo-EM) of human DOLK to define the dolichol- and
    CTP-binding pockets and rationalize CDG1M variant effects.
references:
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location
    vocabulary mapping, accompanied by conservative changes to GO terms applied by
    UniProt
  findings: []
- id: GO_REF:0000052
  title: Gene Ontology annotation based on curation of immunofluorescence data
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: file:human/DOLK/DOLK-uniprot.txt
  title: UniProtKB entry DOLK_HUMAN (Q9UPQ8)
  findings: []
- id: PMID:12213788
  title: 'Expression and characterization of a human cDNA that complements the temperature-sensitive
    defect in dolichol kinase activity in the yeast sec59-1 mutant: the enzymatic
    phosphorylation of dolichol and diacylglycerol are catalyzed by separate CTP-mediated
    kinase activities in Saccharomyces cerevisiae.'
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: >-
      Primary paper establishing human DOLK/hDK1 as dolichol kinase via yeast sec59-1
      complementation; supports MF and Dol-P biosynthesis annotations. Abstract-only in
      cache but title/abstract fully support the cited claims.
- id: PMID:16923818
  title: Human dolichol kinase, a polytopic endoplasmic reticulum membrane protein
    with a cytoplasmically oriented CTP-binding site.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: >-
      Biochemical characterization of human DOLK: ER membrane topology, CTP-binding
      site, kinetics, inactivating mutations. Supports MF and ER membrane annotations.
- id: PMID:17273964
  title: A defect in dolichol phosphate biosynthesis causes a new inherited disorder
    with death in early infancy.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: >-
      Identifies DOLK/DK1 deficiency (DOLK-CDG); characterizes variants with 2-4%
      residual activity. Full text available; supports EXP MF annotation and disease role.
- id: PMID:22242004
  title: Autosomal recessive dilated cardiomyopathy due to DOLK mutations results
    from abnormal dystroglycan O-mannosylation.
  findings: []
  reference_review:
    relevance: HIGH
    correctness: VERIFIED
    review_notes: >-
      DOLK mutations cause dilated cardiomyopathy via deficient alpha-dystroglycan
      O-mannosylation; enzyme deficiency confirmed in fibroblasts. Supports IMP MF/BP.
- id: PMID:25416956
  title: A proteome-scale map of the human interactome network.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: >-
      Large-scale binary interactome map; source of a generic protein-binding IPI that
      does not inform DOLK molecular function.
- id: PMID:26871637
  title: Widespread Expansion of Protein Interaction Capabilities by Alternative Splicing.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: >-
      High-throughput interactome study; source of an uninformative protein-binding IPI.
- id: PMID:28514442
  title: Architecture of the human interactome defines protein communities and disease
    networks.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: >-
      High-throughput interactome study; source of uninformative protein-binding IPIs.
- id: PMID:32296183
  title: A reference map of the human binary protein interactome.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: >-
      HuRI binary interactome map; source of multiple uninformative protein-binding IPIs.
- id: PMID:33961781
  title: Dual proteome-scale networks reveal cell-specific remodeling of the human
    interactome.
  findings: []
  reference_review:
    relevance: LOW
    correctness: VERIFIED
    review_notes: >-
      Proteome-scale AP-MS network study; source of uninformative protein-binding IPIs.
- id: Reactome:R-HSA-446195
  title: DOLK phosphorylates DCHOL to DOLP
  findings: []
- id: Reactome:R-HSA-446199
  title: Synthesis of dolichyl-phosphate
  findings: []
- id: Reactome:R-HSA-4755600
  title: Defective DOLK does not phosphorylate DCHOL
  findings: []