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Primary immunodeficiency or monogenic inflammatory bowel disease v9.18 CD46 Ida Ertmanska changed review comment from: PMID: 33238263 Bamhraz et al., 2020
Saudi Arabian aHUS cohort.
Patient 1 homozygous for CD46: c.736T>A (p.Phe246Ile) variant, as well as het for CFI c.540A>G (p.Glu180Glu) - both labelled VUS. Disease onset at 10yrs, complete recovery after eculizumab treatment.
Patient 5 - homozygous for CD46: c.769 C>A (p.Cys 256*) - LP, as well as heterozygous for CFI c.803 C>T (p.Ser268Leu) variant (LB). Disease onset at 2.5yrs, developed into ESRD and required a post-kidney transplant.
Patient 7 - homozygous for CD46: c.350-351dup AC (p.Glu11ThfsX17) - LP. Disease onset at 21 months. Patient responded to plasma therapy leading to full recovery.

PMID: 29644059 Khandelwal et al., 2018
Cohort of Indian children with aHUS.
Sibling pairs 2–3 and 7–8 with familial disease showed a homozygous c.286 + 2T > G splice-site mutation; in both families, the parents were consanguineous. Patient 9 had a homozygous c.104G > A, p.Cys35Tyr; his affected sibling had died before genetic evaluation. 3 unrelated families total.; to: BIALLELIC CASES:
PMID: 40983966 Hu et al., 2025
Case of a 27-year-old Chinese male diagnosed with atypical Hemolytic Uremic Syndrome (aHUS) at the age of 8, who has experienced seven relapses over a span of 19 years. He was homozygous for a mutation in CD46: c.1127+2T>A (WES). CD46 mRNA and protein expression in the patient's peripheral blood were significantly reduced. Other modifier mutations may affect penetrance here.

PMID: 33238263 Bamhraz et al., 2020
Saudi Arabian aHUS cohort.
Patient 1 homozygous for CD46: c.736T>A (p.Phe246Ile) variant, as well as het for CFI c.540A>G (p.Glu180Glu) - both labelled VUS. Disease onset at 10yrs, complete recovery after eculizumab treatment.
Patient 5 - homozygous for CD46: c.769 C>A (p.Cys 256*) - LP, as well as heterozygous for CFI c.803 C>T (p.Ser268Leu) variant (LB). Disease onset at 2.5yrs, developed into ESRD and required a post-kidney transplant.
Patient 7 - homozygous for CD46: c.350-351dup AC (p.Glu11ThfsX17) - LP. Disease onset at 21 months. Patient responded to plasma therapy leading to full recovery.

PMID: 29644059 Khandelwal et al., 2018
Cohort of Indian children with aHUS.
Sibling pairs 2–3 and 7–8 with familial disease showed a homozygous c.286 + 2T > G splice-site mutation; in both families, the parents were consanguineous. Patient 9 had a homozygous c.104G > A, p.Cys35Tyr; his affected sibling had died before genetic evaluation. 3 unrelated families total.

PMID: 16762990 Fremeaux-Bacchi et al., 2006
3 homozygous aHUS patients (onset at 2, 5, and 27yrs).
Patient 1 - born with Pierre Robin sequence, presented with common variable immunodeficiency. Developed aHUS at 27yrs. Homozygous for CD46 R25X. MFI on granulocytes for CD46 expression was 0.
Patient 2 was homozygous for CD46 Y214X (no CD46 expression on granulocytes; Patient 3 homozygous for IVS2+2T>G - CD46 MFI level was 46 (normal range 600-1400). No mention of immunodeficiency in Patients 2 & 3.

PMID: 16621965 Caprioli et al., 2006
Family 099 - Sardinian origin, 2 individuals homozygous for CD46 IVS1-1G > C, and 1 heterozygous affected member (4 het carriers unaffected). The homozygous sibs developed aHUS early (before age 4 yrs); adult onset seen in heterozygous family members.
Family 024 - 2 comp het sibs CD46 variants c.218C>T, p.R25Stop & c.147G>A, p.C1Y - showed almost no MCP staining by FACS. Parents were carriers of 1 mutation each, unaffected.

PMID: 14566051 Richards et al., 2003
Family 3 - recessive aHUS, CD46 c.822T>C, p.Ser206Pro. Same mutation caused aHUS in Family 2 in a heterozygous state. Demonstrated that het patients had protein expression reduced by 50%, and it was absent in homozygotes.
Primary immunodeficiency or monogenic inflammatory bowel disease v1.94 CFI Louise Daugherty commented on gene: CFI: Gene rating submitted by Kimberly Gilmour and Austen Worth on behalf of London North GLH for the GMS Immunology specialist test group. As discussed with the GMS Immunology Specialist Test Group during webex call 28th March 2019 and confirmed in follow up email 6th September the Specialist Test Group all agreed there is enough evidence to rate this gene Green.
Primary immunodeficiency or monogenic inflammatory bowel disease v1.94 CFI Louise Daugherty commented on gene: CFI: Gene rating submitted by Tracy Briggs, David Gokhale and Abigal Rousseau on behalf of North West GLH for the GMS Immunology specialist test group. As discussed with the GMS Immunology Specialist Test Group during webex call 28th March 2019 and confirmed in follow up email on 20th June the Specialist Test Group all agreed there is enough evidence to rate this gene Green.
Primary immunodeficiency or monogenic inflammatory bowel disease v1.94 CFI Kimberly Gilmour reviewed gene: CFI: Rating: GREEN; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance:
Primary immunodeficiency or monogenic inflammatory bowel disease v1.94 CFI Tracy Briggs reviewed gene: CFI: Rating: GREEN; Mode of pathogenicity: ; Publications: ; Phenotypes: ; Mode of inheritance:
Primary immunodeficiency or monogenic inflammatory bowel disease v1.60 CFI Louise Daugherty Source NHS GMS was added to CFI.
Primary immunodeficiency or monogenic inflammatory bowel disease v1.59 CFI Louise Daugherty Source North West GLH was added to CFI.
Primary immunodeficiency or monogenic inflammatory bowel disease v1.58 CFI Louise Daugherty Source London North GLH was added to CFI.
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty commented on gene: CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty marked gene: CFI as ready
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Sophie Hambleton reviewed gene: CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty edited their review of gene: CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty classified CFI as Green List (high evidence)
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty commented on gene: CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty commented on gene: CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty commented on CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty commented on CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty commented on CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty reviewed CFI
Primary immunodeficiency or monogenic inflammatory bowel disease CFI Louise Daugherty Added gene to panel