IKZF1

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0003700 DNA-binding transcription factor activity	IBA GO_REF:0000033	ACCEPT	Summary: Ikaros is a well-established DNA-binding transcription factor that binds a/gGGAA motifs via its N-terminal zinc fingers and modulates transcription of target gene sets in lymphocytes. The IBA annotation at this level is appropriate. However, given that Ikaros predominantly acts as a transcriptional repressor via NuRD recruitment, the more specific term GO:0001227 (DNA-binding transcription repressor activity, RNA polymerase II-specific) would be more informative for the primary function. Ikaros can also activate some genes, so GO:0003700 is not wrong as a general annotation. Reason: Ikaros is unambiguously a DNA-binding transcription factor. The IBA annotation from phylogenetic inference is well-supported by extensive experimental evidence from multiple publications demonstrating sequence-specific DNA binding and transcriptional regulation. This term is at the right level of generality since Ikaros can both repress and activate transcription depending on context. Supporting Evidence: PMID:8543809 The Ikaros gene encodes a family of lymphocyte-restricted zinc finger DNA binding proteins, highly conserved in human and mouse PMID:23071339 Ikaros is a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis through transcriptional regulation of the earliest stages of lymphocyte ontogeny and differentiation file:human/IKZF1/IKZF1-deep-research-falcon.md Ikaros is a C2H2-type zinc finger transcription factor that serves as a master regulator of hematopoietic cell differentiation, particularly lymphocyte development
GO:0006357 regulation of transcription by RNA polymerase II	IBA GO_REF:0000033	ACCEPT	Summary: Ikaros regulates transcription of genes transcribed by RNA polymerase II, including genes involved in lymphocyte development (IL7R, FLT3, NOTCH1, RAG1, DNTT, HDAC9). This IBA annotation is well-supported by the known biology. Reason: As a DNA-binding transcription factor targeting Pol II-transcribed genes in lymphoid cells, Ikaros is clearly involved in regulation of transcription by RNA polymerase II. The IBA is phylogenetically sound and well-supported by experimental data. This is a core biological process for Ikaros. Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes [Ikaros targets NuRD and BAF complexes to regulate transcription] PMID:23071339 SYK-induced Ikaros activation is essential for its nuclear localization and optimal transcription factor function
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding	IBA GO_REF:0000033	ACCEPT	Summary: Ikaros binds specific a/gGGAA DNA motifs in cis-regulatory regions (enhancers and promoters) of target genes. This has been demonstrated by EMSA, ChIP-seq, and structural studies. The IBA annotation is well-supported. Reason: Ikaros recognizes a pentameric GGGAA core motif in cis-regulatory regions of Pol II-transcribed genes. This is its core DNA-binding function. The IBA from phylogenetic inference is consistent with extensive experimental evidence. Supporting Evidence: PMID:23071339 SYK phoshorylates Ikaros at unique C-terminal serine phosphorylation sites S358 and S361, thereby augmenting its nuclear localization and sequence-specific DNA binding activity
GO:0003677 DNA binding	IEA GO_REF:0000120	ACCEPT	Summary: IEA annotation for DNA binding. Ikaros is indeed a DNA-binding protein. This is broader than the IBA and IDA annotations for more specific DNA binding functions, but not incorrect. Reason: This is a valid broader IEA annotation. There are more specific IDA and IBA annotations (GO:0000978, GO:0003700) that capture the function more precisely, but the IEA at GO:0003677 is not wrong and is consistent with the more specific annotations.
GO:0005634 nucleus	IEA GO_REF:0000120	ACCEPT	Summary: IEA annotation for nuclear localization. Ikaros is a nuclear protein with experimentally verified nuclear localization by multiple studies. This IEA is well-supported. Reason: Nuclear localization of Ikaros is thoroughly established. There are also IDA annotations for nucleus (PMID:21548011, PMID:22106042) that provide direct experimental support. This IEA is consistent with the experimental evidence.
GO:0005737 cytoplasm	IEA GO_REF:0000044	ACCEPT	Summary: IEA annotation for cytoplasmic localization derived from UniProt subcellular location mapping. UniProt notes that isoform Ik6 localizes to the cytoplasm. The canonical full-length isoforms (Ik1, Ik2) are nuclear. This annotation appears to be based on isoform Ik6 behavior. Reason: While the canonical Ikaros isoforms are nuclear, the dominant-negative Ik6 isoform (lacking exons 4-7 and thus the DNA-binding zinc fingers) localizes to the cytoplasm. The IEA is derived from UniProt subcellular location which notes this. The annotation is technically correct but applies primarily to the Ik6 isoform.
GO:0006325 chromatin organization	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation from UniProt keyword mapping (Chromatin regulator). Ikaros recruits the NuRD chromatin remodeling complex and affects chromatin accessibility at target loci. This is well-supported by the biology. Reason: Ikaros is involved in chromatin organization through its recruitment of NuRD (CHD4/HDAC1/RBBP4) and BAF (SWI/SNF) chromatin remodeling complexes to target loci, causing changes in chromatin accessibility and histone modifications (loss of H3K27ac). The IEA keyword mapping is appropriate. Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes
GO:0007498 mesoderm development	IEA GO_REF:0000117	MARK AS OVER ANNOTATED	Summary: IEA annotation from ARBA machine learning model. Hematopoietic cells are derived from mesoderm, so there is an indirect connection, but Ikaros is not a core regulator of mesoderm development per se. Its role is specifically in lymphoid and hematopoietic cell differentiation. Reason: While hematopoietic cells are mesodermal derivatives, annotating Ikaros to mesoderm development is over-annotation. Ikaros functions specifically in hematopoietic and lymphoid lineage commitment and differentiation, not in broad mesoderm specification. The ARBA model likely inferred this from the association of lymphoid development with mesodermal lineage, but the annotation is too general and misleading for Ikaros's actual role.
GO:0008270 zinc ion binding	IEA GO_REF:0000043	ACCEPT	Summary: IEA from UniProt keyword mapping. Ikaros has six C2H2-type zinc fingers that coordinate zinc ions. This is structurally accurate. Reason: Ikaros contains six C2H2-type zinc finger domains (four N-terminal for DNA binding, two C-terminal for dimerization), each of which coordinates a zinc ion. This is a well-established structural feature confirmed by X-ray crystallography and cryo-EM structures (PDB: 6H0F, 8D7Z, 8RQC, 8TNQ).
GO:0030098 lymphocyte differentiation	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA model for lymphocyte differentiation. Ikaros is essential for lymphocyte differentiation, particularly B and T cell lineage commitment. This is a core function of Ikaros. There is also an IMP annotation for this term. Reason: Lymphocyte differentiation is the most fundamental biological process role of Ikaros. This IEA is consistent with extensive experimental evidence and the IMP annotation from PMID:17934067. Ikaros is absolutely required for B and T cell development.
GO:0046872 metal ion binding	IEA GO_REF:0000043	ACCEPT	Summary: IEA from UniProt keyword mapping (Metal-binding). This is a parent term of zinc ion binding (GO:0008270) and is redundant but not incorrect. Reason: This is a broader parent of the more specific zinc ion binding annotation. It is technically correct given the zinc finger domains, though less informative than GO:0008270.
GO:0005515 protein binding	IPI PMID:21516116 Next-generation sequencing to generate interactome datasets	MARK AS OVER ANNOTATED	Summary: IPI annotation from a high-throughput next-generation sequencing interactome study (Stelzl lab). The interactions include CTBP2, RAD51D, and others detected by Y2H. Reason: 'Protein binding' (GO:0005515) is uninformative and does not tell us about the actual molecular function. High-throughput Y2H studies can detect many interactions, some of which may not be physiologically relevant. Some of the detected interactors (e.g., CTBP2) are relevant to Ikaros transcriptional repression function (CtBP is a known co-repressor partner), but the generic 'protein binding' annotation does not capture this. Where specific interactions are functionally validated, more specific terms should be used.
GO:0005515 protein binding	IPI PMID:25416956 A proteome-scale map of the human interactome network	MARK AS OVER ANNOTATED	Summary: IPI annotation from a large-scale proteome-wide interactome mapping study (Rolland et al., 2014). This study detected many interactors including MTA1, CTBP1, CTBP2 (co-repressor complex partners), PIN1, and others. Some of these interactions are physiologically relevant (MTA1 is a NuRD component, CtBP1/2 are known Ikaros co-repressors). Reason: As with the previous protein binding annotation, GO:0005515 is uninformative. While some of the interactors (MTA1, CTBP1, CTBP2) validate known Ikaros functions in the NuRD complex and co-repressor recruitment, the generic protein binding term does not capture these meaningful interactions. High-throughput studies inherently include false positives.
GO:0005515 protein binding	IPI PMID:29892012 An interactome perturbation framework prioritizes damaging m...	MARK AS OVER ANNOTATED	Summary: IPI annotation from a study on interactome perturbation by missense mutations in developmental disorders (Sahni et al., 2015). Reason: Generic protein binding annotation from a high-throughput perturbation study. GO:0005515 is uninformative about the actual function of Ikaros.
GO:0005515 protein binding	IPI PMID:31515488 Extensive disruption of protein interactions by genetic vari...	MARK AS OVER ANNOTATED	Summary: IPI annotation from a study on disruption of protein interactions by genetic variants across allele frequency spectrum. Reason: Generic protein binding annotation from high-throughput study. GO:0005515 does not add informative functional annotation for Ikaros.
GO:0005515 protein binding	IPI PMID:33961781 Dual proteome-scale networks reveal cell-specific remodeling...	MARK AS OVER ANNOTATED	Summary: IPI from a dual proteome-scale network study (Huttlin et al., 2021). Detected interactors include CTBP2, MTA1, WTAP, and MCRS1. MTA1 is a validated NuRD subunit. Reason: Generic protein binding annotation from high-throughput study. While MTA1 and CTBP2 interactions validate known Ikaros biology, GO:0005515 is too general.
GO:0005515 protein binding	IPI PMID:39251607 Systematic identification of post-transcriptional regulatory...	MARK AS OVER ANNOTATED	Summary: IPI from a systematic post-transcriptional regulatory module study. The interactor is DDX6 (P26196). Reason: Generic protein binding annotation. DDX6 interaction with Ikaros lacks clear functional significance in the context of Ikaros's known transcriptional regulatory roles.
GO:0005515 protein binding	IPI PMID:40205054 Multimodal cell maps as a foundation for structural and func...	MARK AS OVER ANNOTATED	Summary: IPI from a multimodal cell maps study (Hein et al., 2024). Detected interactor is CTBP2. Reason: Generic protein binding annotation. While CTBP2 is a validated co-repressor partner of Ikaros, GO:0005515 does not capture this functional significance.
GO:0005654 nucleoplasm	IDA GO_REF:0000052	ACCEPT	Summary: IDA annotation based on immunofluorescence data from the Human Protein Atlas (HPA). Ikaros is detected in the nucleoplasm, consistent with its role as a nuclear transcription factor. Reason: Nucleoplasmic localization is consistent with Ikaros's function as a DNA-binding transcription factor. In resting lymphocytes, Ikaros is distributed diffusely throughout the nucleus (nucleoplasm), while in proliferating cells it concentrates at pericentromeric heterochromatin. The HPA immunofluorescence data support this nucleoplasmic localization.
GO:0005515 protein binding	IPI PMID:15491138 Structural studies on a protein-binding zinc-finger domain o...	MARK AS OVER ANNOTATED	Summary: IPI annotation for protein binding based on interaction with IQSEC2 (Q9H2S9). This is from a CAFA-curated annotation. The interaction was detected by protein-protein interaction assay. Reason: Generic protein binding annotation. The interaction with IQSEC2 does not have clear functional relevance to Ikaros's known transcriptional regulatory role. GO:0005515 is uninformative.
GO:0032991 protein-containing complex	IDA PMID:23071339 Serine phosphorylation by SYK is critical for nuclear locali...	MODIFY	Summary: IDA annotation indicating Ikaros is part of a protein-containing complex, curated by MGI based on the Uckun et al. (2012) study on SYK phosphorylation of Ikaros. The study demonstrates Ikaros exists in protein complexes (with SYK, and as part of larger complexes in the nucleus). Reason: While Ikaros is indeed part of protein complexes, GO:0032991 is extremely generic. The most well-characterized complex containing Ikaros is the NuRD complex (GO:0016581), which includes CHD4, HDAC1, HDAC2, RBBP4, RBBP7, MTA1/2, MBD2/3. Ikaros directly interacts with CHD4 within the NuRD complex. A more specific annotation to NuRD complex would be more informative. Proposed replacements: NuRD complex Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes [Ikaros is a component of the NuRD complex] PMID:23071339 Serine phosphorylation by SYK is critical for nuclear localization and transcription factor function of Ikaros
GO:0019904 protein domain specific binding	IPI PMID:15491138 Structural studies on a protein-binding zinc-finger domain o...	UNDECIDED	Summary: IPI annotation for protein domain specific binding, curated by CAFA. The interactor is IQSEC2 (Q9H2S9). This indicates that the Ikaros interaction with IQSEC2 involves a specific domain. Reason: The publication PMID:15491138 is not available in the publications cache so the details of the IQSEC2 interaction cannot be verified. IQSEC2 is a guanine nucleotide exchange factor for ARF GTPases and its functional relationship to Ikaros's transcriptional function is unclear.
GO:0032991 protein-containing complex	IMP PMID:15491138 Structural studies on a protein-binding zinc-finger domain o...	MODIFY	Summary: IMP annotation indicating Ikaros is part of a protein-containing complex, curated by CAFA from PMID:15491138. Mutant phenotype evidence for complex membership. Reason: As with the IDA annotation for GO:0032991, this term is too generic. Ikaros is a well-characterized component of the NuRD complex. The more specific term GO:0016581 (NuRD complex) should be used. Proposed replacements: NuRD complex
GO:0003677 DNA binding	IDA PMID:21548011 Congenital pancytopenia and absence of B lymphocytes in a ne...	ACCEPT	Summary: IDA annotation for DNA binding from Goldman et al. (2012), which studied a CVID13-causing mutation (Y210C) in IKZF1 and characterized wild-type vs. mutant DNA binding. The study confirmed that wild-type Ikaros binds DNA. Reason: DNA binding is a core molecular function of Ikaros, mediated by its N-terminal C2H2 zinc fingers. This IDA from PMID:21548011 provides direct experimental evidence. There are also more specific annotations (GO:0000978) that better describe the DNA-binding specificity.
GO:0005634 nucleus	IDA PMID:21548011 Congenital pancytopenia and absence of B lymphocytes in a ne...	ACCEPT	Summary: IDA annotation for nuclear localization from Goldman et al. (2012). The study demonstrated that wild-type Ikaros localizes to the nucleus, while the Y210C mutant shows diffuse nuclear localization (loss of pericentromeric foci). Reason: Nuclear localization is essential for Ikaros transcription factor function. The IDA from PMID:21548011 provides direct experimental evidence via confocal microscopy. Supporting Evidence: PMID:23071339 SYK-induced Ikaros activation is essential for its nuclear localization and optimal transcription factor function
GO:0005721 pericentric heterochromatin	IDA PMID:21548011 Congenital pancytopenia and absence of B lymphocytes in a ne...	ACCEPT	Summary: IDA annotation for pericentric heterochromatin localization from Goldman et al. (2012). Ikaros forms characteristic punctate foci at pericentromeric heterochromatin in proliferating lymphocytes. The Y210C mutant disrupts this localization. Reason: Pericentromeric heterochromatin localization is a distinctive and functionally important feature of Ikaros biology. In proliferating lymphocytes, Ikaros forms bright punctate foci at pericentromeric heterochromatin, which is thought to be important for gene silencing and heterochromatin maintenance. This localization requires intact zinc fingers 2 and 3.
GO:0003677 DNA binding	IDA PMID:22106042 Cell cycle-specific function of Ikaros in human leukemia	ACCEPT	Summary: IDA annotation for DNA binding from Li et al. (2012), which studied cell cycle-specific function of Ikaros in human leukemia. The study demonstrated that Ikaros DNA-binding ability varies through the cell cycle, with phosphorylation reducing DNA binding. Reason: This IDA provides additional experimental evidence for Ikaros DNA binding, with the important finding that DNA binding is cell-cycle regulated by phosphorylation.
GO:0005634 nucleus	IDA PMID:22106042 Cell cycle-specific function of Ikaros in human leukemia	ACCEPT	Summary: IDA annotation for nuclear localization from Li et al. (2012). The study showed that Ikaros nuclear localization varies through the cell cycle. Reason: Provides direct experimental evidence for nuclear localization. Consistent with other nucleus annotations.
GO:0030098 lymphocyte differentiation	IMP PMID:17934067 The role of Ikaros in human erythroid differentiation	ACCEPT	Summary: IMP annotation for lymphocyte differentiation from Dijon et al. (2008), which studied the role of Ikaros in human erythroid differentiation. The study used Ikaros isoform manipulation to demonstrate effects on differentiation of hematopoietic progenitors, including lymphoid lineages. Reason: Lymphocyte differentiation is a core biological process for Ikaros. Ikaros is absolutely required for B and T cell development. The IMP from PMID:17934067 provides human experimental evidence. Mouse knockouts completely lack lymphoid lineages, and human haploinsufficiency (CVID13) causes B cell deficiency. Supporting Evidence: PMID:23071339 Ikaros is a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis through transcriptional regulation of the earliest stages of lymphocyte ontogeny and differentiation
GO:0030218 erythrocyte differentiation	IMP PMID:17934067 The role of Ikaros in human erythroid differentiation	KEEP AS NON CORE	Summary: IMP annotation for erythrocyte differentiation from Dijon et al. (2008), titled "The role of Ikaros in human erythroid differentiation." The study demonstrated that Ikaros modulates erythroid differentiation of human hematopoietic progenitors. Reason: While Ikaros's primary role is in lymphocyte development, the Dijon et al. study provided evidence that Ikaros also plays a role in erythroid differentiation. UniProt notes that Ikaros "increases normal apoptosis in adult erythroid cells" and "targets NuRD and BAF complexes to the beta-globin locus in adult erythrocytes." This is a secondary, non-core function compared to the primary role in lymphopoiesis.
GO:0045892 negative regulation of DNA-templated transcription	ISS GO_REF:0000024	ACCEPT	Summary: ISS annotation from manual transfer of experimentally verified annotation from mouse ortholog (Q03267). Ikaros is well-established as a transcriptional repressor that recruits NuRD complex to target genes, causing loss of enhancer H3K27ac and chromatin accessibility. Reason: Transcriptional repression is the primary mode of action of Ikaros. Recent studies (Zhang et al., Blood 2025) have mapped conserved helical motifs in the Ikaros intrinsically disordered region that bind RBBP4 in NuRD, and time-resolved analyses show that downregulation of target transcripts precedes any activation events upon Ikaros induction. The ISS annotation based on mouse ortholog data is well-supported. Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes [forms NuRD repressor complex]
GO:0003677 DNA binding	TAS PMID:8543809 The Ikaros gene encodes a family of lymphocyte-restricted zi...	ACCEPT	Summary: TAS annotation for DNA binding from Molnar et al. (1996), the original characterization of the human Ikaros gene. This seminal paper established Ikaros as a family of lymphocyte-restricted zinc finger DNA binding proteins. Reason: This is the foundational publication establishing Ikaros as a DNA-binding protein. While there are now more specific annotations, this TAS annotation reflects established knowledge that remains accurate. Supporting Evidence: PMID:8543809 The Ikaros gene encodes a family of lymphocyte-restricted zinc finger DNA binding proteins, highly conserved in human and mouse
GO:0007498 mesoderm development	TAS PMID:8543809 The Ikaros gene encodes a family of lymphocyte-restricted zi...	MARK AS OVER ANNOTATED	Summary: TAS annotation for mesoderm development from Molnar et al. (1996). This early annotation likely reflected the connection between lymphoid development and mesodermal origin of hematopoietic cells. Reason: As with the IEA annotation for the same term, this is an over-annotation. Ikaros is specifically involved in hematopoietic/lymphoid differentiation, not in mesoderm development broadly. The original paper (Molnar et al., 1996) characterized Ikaros as a lymphoid transcription factor, not as a mesoderm regulator. The TAS annotation appears to have been applied too broadly.
GO:0001227 DNA-binding transcription repressor activity, RNA polymerase II-specific	ISS PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin re...	NEW	Summary: Ikaros predominantly functions as a transcriptional repressor. It recruits the NuRD chromatin remodeling/HDAC complex to target gene enhancers, causing rapid loss of chromatin accessibility and H3K27ac. Recent work (Zhang et al., Blood 2025) mapped the conserved helical motifs in the Ikaros disordered region that mediate NuRD binding. Time-resolved analyses show that repression (downregulation of targets, loss of H3K27ac) is the immediate dominant response upon Ikaros induction, preceding any activation events. This is the most specific and informative MF term for Ikaros's primary transcriptional activity, as recommended by the GO TF annotation guidelines. Reason: Per GO transcription factor annotation guidelines, the recommended MF annotation for a DNA-binding transcription factor is a child of GO:0000981 (RNA polymerase II-specific). Since Ikaros predominantly acts as a repressor via NuRD recruitment, GO:0001227 is the most accurate term. This is not currently annotated in the GOA dataset but is strongly supported by the literature. Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes [Ikaros recruits NuRD repressor complex] PMID:23071339 Ikaros is a zinc finger-containing DNA-binding protein that plays a pivotal role in immune homeostasis through transcriptional regulation
GO:0016581 NuRD complex	IDA PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin re...	NEW	Summary: Ikaros is a well-characterized component of the NuRD chromatin remodeling complex in lymphocytes. Kim et al. (1999) identified Ikaros in the NuRD complex and showed it interacts directly with CHD4. The NuRD complex containing Ikaros includes CHD4, HDAC1, HDAC2, RBBP4, RBBP7, MTA1/2, MBD2/3. This complex association is central to Ikaros's transcriptional repressor function. Reason: The existing annotations use the generic GO:0032991 (protein-containing complex). Ikaros's membership in the NuRD complex is its best-characterized complex association and is central to its function. This specific CC annotation should be added. Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes
GO:0042802 identical protein binding	IPI PMID:8543809 The Ikaros gene encodes a family of lymphocyte-restricted zi...	NEW	Summary: Ikaros forms homodimers via its C-terminal zinc fingers (F5-F6). This homodimerization is a well-established feature of Ikaros biology, documented in the original characterization papers and confirmed by subsequent structural and biochemical studies. The GOA dataset from IntAct includes the self-interaction (Q13422-7 with Q13422-7). This is functionally important as dimerization modulates transcriptional activity. Reason: Ikaros homodimerization via C-terminal zinc fingers is well-established and functionally important. This is more informative than generic GO:0005515 (protein binding) for capturing the self-interaction.
GO:0000981 DNA-binding transcription factor activity, RNA polymerase II-specific	IBA GO_REF:0000033	NEW	Summary: Ikaros functions as a DNA-binding transcription factor that regulates RNA polymerase II transcription. It can both repress (primarily) and activate transcription depending on context and target gene. The deep research review (IKZF1-deep-research-falcon.md) details that Ikaros directly regulates Pol II transcription at target genes including IL7R, FLT3, NOTCH1, RAG1, DNTT, and HDAC9. Reason: This Pol II-specific transcription factor activity term is used in core_functions to describe the broader transcription factor role of Ikaros (complementing the more specific repressor term GO:0001227). While GO:0003700 (the parent term) is present as an IBA, this more specific child term better captures that Ikaros targets are Pol II-transcribed genes. Supporting Evidence: PMID:10204490 Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes
GO:0030183 B cell differentiation	IMP PMID:26981933 Loss of B Cells in Patients with Heterozygous Mutations in I...	NEW	Summary: Ikaros is essential for B cell differentiation. Patients with heterozygous IKZF1 mutations (R162Q, R162L, H167R, R184Q) that abolish DNA binding show near-complete absence of B cells (Kuehn et al., 2016). The deep research review (IKZF1-deep-research-falcon.md) details that Ikaros-null mice lack all B cells, and haploinsufficient patients have dramatically reduced B cell counts. B cell differentiation is a more specific child of lymphocyte differentiation (GO:0030098) that more precisely captures Ikaros's most striking phenotype. Reason: While lymphocyte differentiation (GO:0030098) is already annotated, B cell differentiation (GO:0030183) specifically captures the most prominent phenotype of IKZF1 loss-of-function in both mice and humans. This specificity is warranted given the dramatic B cell deficiency phenotype. Supporting Evidence: PMID:26981933 Heterozygous mutations in the transcription factor IKAROS caused an autosomal dominant form of CVID that is associated with a striking decrease in B-cell numbers PMID:21548011 Congenital pancytopenia and absence of B lymphocytes in a neonate with a mutation in the Ikaros gene

Gene Description

Existing Annotations Review

Core Functions

References

Deep Research

Falcon

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