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05 Aug 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.62	NOX1	Achchuthan Shanmugasundram changed review comment from: PMID:26301257 (2015) reported targeted exome sequencing of epithelial NADPH oxidases NOX1 and DUOX2 on 209 children with very early onset inflammatory bowel disease (VEOIBD), of which three unrelated patients were identified with two different missense variants in NOX1 (c.988G>A, p.Pro330Ser; c.967G>A, p.Asp360Asn). The NOX1 p.Asp360Asn variant is a common polymorphism (rs34688635) and was replicated in a male Ashkenazi Jewish ulcerative colitis cohort. However, p.Pro330Ser is not found in gnomAD v4.1.1. PMID:29091079 (2018) reported eight male VEOIBD patients with six hemizygous non-synonymous NOX1 variants, identified via either whole-genome or whole-exome sequencing. Loss-of-function was validated in p.Asn122His and p.Thr497Ala, and to a lesser degree in p.Tyr470His, p.Arg287Gln, p.Ile67Met, p.Gln293Arg as well as the previously described p.Pro330Ser, and the common NOX1 SNP p.Asp360Asn (rs34688635) variant. The missense variant p.Asn122His abrogated reactive oxygen species (ROS) production in cell lines, ex vivo colonic explants, and patient-derived colonic organoid cultures. Within colonic crypts, NOX1 constitutively generates a high level of ROS in the crypt lumen. Analysis of 9,513 controls and 11,140 IBD patients of non-Jewish European ancestry did not reveal an association between p.Asp360Asn and IBD. The authors suggest that loss-of-function variants in NOX1 do not cause a Mendelian disorder of high penetrance but are a context-specific modifier. PMID:32064493 (2020) reported the identification of a stop-gain variant in NOX1 (c.160C>T, p.Arg54Ter) in two patients from a single family with early-onset IBD. Functional studies demonstrated that loss of NOX1 function causes abrogated ROS activity and is associated with complex alterations of cell migration dynamics, wound healing, and epithelial cytoskeletal function that affect barrier function and repair. This gene has not yet been associated with relevant phenotypes either in OMIM or in ClinGen (last accessed 05 August 2026).; to: PMID:26301257 (2015) reported targeted exome sequencing of epithelial NADPH oxidases NOX1 and DUOX2 on 209 children with very early onset inflammatory bowel disease (VEOIBD), of which three unrelated patients were identified with two different missense variants in NOX1 (c.988G>A, p.Pro330Ser in one patient; c.967G>A, p.Asp360Asn in two patients). The NOX1 p.Asp360Asn variant is a common polymorphism (rs34688635) and was replicated in a male Ashkenazi Jewish ulcerative colitis cohort. However, p.Pro330Ser is not found in gnomAD v4.1.1. PMID:29091079 (2018) reported eight male VEOIBD patients with six hemizygous non-synonymous NOX1 variants, identified via either whole-genome or whole-exome sequencing. Loss-of-function was validated in p.Asn122His and p.Thr497Ala, and to a lesser degree in p.Tyr470His, p.Arg287Gln, p.Ile67Met, p.Gln293Arg as well as the previously described p.Pro330Ser, and the common NOX1 SNP p.Asp360Asn (rs34688635) variant. The missense variant p.Asn122His abrogated reactive oxygen species (ROS) production in cell lines, ex vivo colonic explants, and patient-derived colonic organoid cultures. Within colonic crypts, NOX1 constitutively generates a high level of ROS in the crypt lumen. Analysis of 9,513 controls and 11,140 inflammatory bowel disease (IBD) patients of non-Jewish European ancestry did not reveal an association between p.Asp360Asn and IBD. The authors suggest that loss-of-function variants in NOX1 do not cause a Mendelian disorder of high penetrance but are a context-specific modifier. PMID:32064493 (2020) reported the identification of a stop-gain variant in NOX1 (c.160C>T, p.Arg54Ter) in two patients from a single family with early-onset IBD. Functional studies demonstrated that loss of NOX1 function causes abrogated ROS activity and is associated with complex alterations of cell migration dynamics, wound healing, and epithelial cytoskeletal function that affect barrier function and repair. This gene has not yet been associated with relevant phenotypes either in OMIM or in ClinGen (last accessed 05 August 2026).
05 Aug 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.62	NOX1	Achchuthan Shanmugasundram changed review comment from: PMID:26301257 (2015) reported targeted exome sequencing of epithelial NADPH oxidases NOX1 and DUOX2 on 209 children with very early onset inflammatory bowel disease (VEOIBD), of which three unrelated patients were identified with two different missense variants in NOX1 (c.988G>A, p.Pro330Ser; c.967G>A, p.Asp360Asn). The NOX1 p.Asp360Asn variant is a common polymorphism (rs34688635) and was replicated in a male Ashkenazi Jewish ulcerative colitis cohort. However, p.Pro330Ser is not found in gnomAD v4.1.1. PMID:29091079 (2018) reported eight male VEOIBD patients with six hemizygous non-synonymous NOX1 variants, identified via either whole-genome or whole-exome sequencing. Loss-of-function was validated in p.Asn122His and p.Thr497Ala, and to a lesser degree in p.Tyr470His, p.Arg287Gln, p.Ile67Met, p.Gln293Arg as well as the previously described p.Pro330Ser, and the common NOX1 SNP p.Asp360Asn (rs34688635) variant. The missense variant p.Asn122His abrogated reactive oxygen species (ROS) production in cell lines, ex vivo colonic explants, and patient-derived colonic organoid cultures. Within colonic crypts, NOX1 constitutively generates a high level of ROS in the crypt lumen. Analysis of 9,513 controls and 11,140 IBD patients of non-Jewish European ancestry did not reveal an association between p.Asp360Asn and IBD. The authors suggest that loss-of-function variants in NOX1 do not cause a Mendelian disorder of high penetrance but are a context-specific modifier. PMID:32064493 (2020) reported the identification of a stop-gain variant in NOX1 (c.160C>T, p.Arg54Ter) in two patients from a single family with early-onset IBD. Functional studies demonstrated that loss of NOX1 function causes abrogated ROS activity and is associated with complex alterations of cell migration dynamics, wound healing, and epithelial cytoskeletal function that affect barrier function and repair. This gene has not yet been associated with relevant phenotypes either in OMIM or in ClinGen. ; to: PMID:26301257 (2015) reported targeted exome sequencing of epithelial NADPH oxidases NOX1 and DUOX2 on 209 children with very early onset inflammatory bowel disease (VEOIBD), of which three unrelated patients were identified with two different missense variants in NOX1 (c.988G>A, p.Pro330Ser; c.967G>A, p.Asp360Asn). The NOX1 p.Asp360Asn variant is a common polymorphism (rs34688635) and was replicated in a male Ashkenazi Jewish ulcerative colitis cohort. However, p.Pro330Ser is not found in gnomAD v4.1.1. PMID:29091079 (2018) reported eight male VEOIBD patients with six hemizygous non-synonymous NOX1 variants, identified via either whole-genome or whole-exome sequencing. Loss-of-function was validated in p.Asn122His and p.Thr497Ala, and to a lesser degree in p.Tyr470His, p.Arg287Gln, p.Ile67Met, p.Gln293Arg as well as the previously described p.Pro330Ser, and the common NOX1 SNP p.Asp360Asn (rs34688635) variant. The missense variant p.Asn122His abrogated reactive oxygen species (ROS) production in cell lines, ex vivo colonic explants, and patient-derived colonic organoid cultures. Within colonic crypts, NOX1 constitutively generates a high level of ROS in the crypt lumen. Analysis of 9,513 controls and 11,140 IBD patients of non-Jewish European ancestry did not reveal an association between p.Asp360Asn and IBD. The authors suggest that loss-of-function variants in NOX1 do not cause a Mendelian disorder of high penetrance but are a context-specific modifier. PMID:32064493 (2020) reported the identification of a stop-gain variant in NOX1 (c.160C>T, p.Arg54Ter) in two patients from a single family with early-onset IBD. Functional studies demonstrated that loss of NOX1 function causes abrogated ROS activity and is associated with complex alterations of cell migration dynamics, wound healing, and epithelial cytoskeletal function that affect barrier function and repair. This gene has not yet been associated with relevant phenotypes either in OMIM or in ClinGen (last accessed 05 August 2026).
04 Aug 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.62	DUOX2	Arina Puzriakova Phenotypes for gene: DUOX2 were changed from inflammatory bowel disease; MONDO:0005265; IBD; VEOIBD to inflammatory bowel disease, MONDO:0005265
03 Aug 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.58	NOX1	Achchuthan Shanmugasundram changed review comment from: PMID:26301257 (2015) reported targeted exome sequencing of epithelial NADPH oxidases NOX1 and DUOX2 on 209 children with very early onset inflammatory bowel disease (VEOIBD), of which three unrelated patients were identified with two different missense variants in NOX1 (c.988G>A, p.Pro330Ser; c.967G>A, p.Asp360Asn). The NOX1 p.Asp360Asn variant is a common polymorphism (rs34688635) and was replicated in a male Ashkenazi Jewish ulcerative colitis cohort. However, p.Pro330Ser is not found in gnomAD v4.1.1. PMID:29091079 (2018) reported eight male VEOIBD patients with six hemizygous non-synonymous NOX1 variants, identified via either whole-genome or whole-exome sequencing. Loss-of-function was validated in p.Asn122His and p.Thr497Ala, and to a lesser degree in p.Tyr470His, p.Arg287Gln, p.Ile67Met, p.Gln293Arg as well as the previously described p.Pro330Ser, and the common NOX1 SNP p.Asp360Asn (rs34688635) variant. The missense variant p.Asn122His abrogated reactive oxygen species (ROS) production in cell lines, ex vivo colonic explants, and patient-derived colonic organoid cultures. Within colonic crypts, NOX1 constitutively generates a high level of ROS in the crypt lumen. Analysis of 9,513 controls and 11,140 IBD patients of non-Jewish European ancestry did not reveal an association between p.Asp360Asn and IBD. The authors suggest that loss-of-function variants in NOX1 do not cause a Mendelian disorder of high penetrance but are a context-specific modifier. PMID:32064493 (2020) reported the identification of a stop-gain variant in NOX1 (c.160C>T, p.Arg54Ter) in patients with pediatric-onset IBD.; to: PMID:26301257 (2015) reported targeted exome sequencing of epithelial NADPH oxidases NOX1 and DUOX2 on 209 children with very early onset inflammatory bowel disease (VEOIBD), of which three unrelated patients were identified with two different missense variants in NOX1 (c.988G>A, p.Pro330Ser; c.967G>A, p.Asp360Asn). The NOX1 p.Asp360Asn variant is a common polymorphism (rs34688635) and was replicated in a male Ashkenazi Jewish ulcerative colitis cohort. However, p.Pro330Ser is not found in gnomAD v4.1.1. PMID:29091079 (2018) reported eight male VEOIBD patients with six hemizygous non-synonymous NOX1 variants, identified via either whole-genome or whole-exome sequencing. Loss-of-function was validated in p.Asn122His and p.Thr497Ala, and to a lesser degree in p.Tyr470His, p.Arg287Gln, p.Ile67Met, p.Gln293Arg as well as the previously described p.Pro330Ser, and the common NOX1 SNP p.Asp360Asn (rs34688635) variant. The missense variant p.Asn122His abrogated reactive oxygen species (ROS) production in cell lines, ex vivo colonic explants, and patient-derived colonic organoid cultures. Within colonic crypts, NOX1 constitutively generates a high level of ROS in the crypt lumen. Analysis of 9,513 controls and 11,140 IBD patients of non-Jewish European ancestry did not reveal an association between p.Asp360Asn and IBD. The authors suggest that loss-of-function variants in NOX1 do not cause a Mendelian disorder of high penetrance but are a context-specific modifier. PMID:32064493 (2020) reported the identification of a stop-gain variant in NOX1 (c.160C>T, p.Arg54Ter) in two patients from a single family with early-onset IBD. Functional studies demonstrated that loss of NOX1 function causes abrogated ROS activity and is associated with complex alterations of cell migration dynamics, wound healing, and epithelial cytoskeletal function that affect barrier function and repair. This gene has not yet been associated with relevant phenotypes either in OMIM or in ClinGen.
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.37	DUOX2	Ida Ertmanska Tag watchlist_moi tag was added to gene: DUOX2.
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.37	DUOX2	Ida Ertmanska commented on gene: DUOX2: MONOALLELIC CASES: PMID: 26301257 Hayes et al., 2015 2 male probands, diagnosed with IBD / ulcerative colitis at 4.7 and 4.3 yrs. Het for DUOX2 missense variants. Adding watchlist_moi tag to monitor for heterozygous case reports.
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.37	DUOX2	Ida Ertmanska Phenotypes for gene: DUOX2 were changed from Inflammatory bowel disease; IBD; VEOIBD to inflammatory bowel disease; MONDO:0005265; IBD; VEOIBD
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.36	DUOX2	Ida Ertmanska Publications for gene: DUOX2 were set to 38075699; 26301257; 35429653
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.35	DUOX2	Ida Ertmanska Mode of inheritance for gene: DUOX2 was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.34	DUOX2	Ida Ertmanska Classified gene: DUOX2 as Amber List (moderate evidence)
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.34	DUOX2	Ida Ertmanska Gene: duox2 has been classified as Amber List (Moderate Evidence).
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.33	DUOX2	Ida Ertmanska Tag Q3_26_promote_green tag was added to gene: DUOX2.
29 Jul 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.33	DUOX2	Ida Ertmanska reviewed gene: DUOX2: Rating: GREEN; Mode of pathogenicity: None; Publications: 26301257, 28683258, 35429653, 38075699; Phenotypes: inflammatory bowel disease, MONDO:0005265; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
17 Jun 2026	Primary immunodeficiency or monogenic inflammatory bowel disease v9.9	DUOX2	Boaz Palterer gene: DUOX2 was added gene: DUOX2 was added to Primary immunodeficiency or monogenic inflammatory bowel disease. Sources: Literature Mode of inheritance for gene: DUOX2 was set to Unknown Publications for gene: DUOX2 were set to 38075699; 26301257; 35429653 Phenotypes for gene: DUOX2 were set to Inflammatory bowel disease; IBD; VEOIBD Penetrance for gene: DUOX2 were set to unknown Review for gene: DUOX2 was set to GREEN Added comment: DUOX2 encodes Dual Oxidase 2, an H2O2-producing NADPH oxidase primarily expressed at the apical membranes of enterocytes, where it plays a critical role in maintaining intestinal microbial homeostasis and innate immune defense. While biallelic variants in DUOX2 are classically associated with congenital hypothyroidism (Thyroid dyshormonogenesis 6; OMIM 607200), a distinct phenotype linking DUOX2 deficiency to Inborn Errors of Immunity (IEI) and very early-onset inflammatory bowel disease (VEO-IBD) has been reported in several case reports. The initial association was reported when inactivating missense variants in DUOX2 were identified in VEO-IBD patients, resulting in significantly reduced reactive oxygen species (ROS) production by intestinal epithelial cells and defective host resistance to enteric pathogens like Campylobacter jejuni (Hayes et al., 2015). More recently, the phenotypic spectrum has been expanded to include monogenic neonatal-onset IBD. Patients with compound heterozygous DUOX2 variants have presented with severe intestinal inflammation and colon stenosis shortly after birth, displaying significantly decreased catalytic activity without concurrent clinical hypothyroidism (Finocchi et al, Kyodo et al. Crawford et al. ). Hayes described 2 patient with heterozgous DUOX2 VUS and VEOIBD https://pmc.ncbi.nlm.nih.gov/articles/PMC4539615/ Finocchi et al described 1 month old with VEOIBD with compound heterozygous VUS in DUOX2 https://pubmed.ncbi.nlm.nih.gov/38075699/ Kyodo et al. described 1 year old with VEOIBD with compound heterozygous VUS in DUOX2 https://pubmed.ncbi.nlm.nih.gov/35429653/ Crawford et al, additional case report: 5-year-old male with compound heterozygous VUS in DUOX2 https://rupress.org/jhi/article/1/CIS2025/CIS2025abstract.49/277486/Biallelic-DUOX2-Variants-and-the-Link-to-Very Sources: Literature