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Undiagnosed metabolic disorders v1.631 PPOX Sharon Whatley changed review comment from: Relevant metabolic investigation: urine porphobilinogen and plasma porphyrin fluorescence emission
PMID: 38940544 Aarsand reports that the acute porphyrias are a group of rare inborn errors of metabolism caused by abnormal functioning of haem biosynthesis enzymes and are associated with acute neurovisceral attacks characterized by severe abdominal pain and neuropsychiatric symptoms that may require highly specialized intensive care. The acute porphyrias, acute intermittent porphyria (AIP), variegate porphyria (VP) and hereditary coproporphyria (HCP), usually become symptomatic in early adulthood.
PMID: 10486317 Whatley found that skin lesions were the only manifestation of VP in 59% of patients whereas 21% of patients had acute attacks and skin lesions. The remainder having only acute attacks.
PMID: 8290408 Hift reports that the cutaneous VP presents with photosensitivity which may result in blistering, erosions, a fragile skin with chronic scarring and pigmentary changes
PMID: 38940544 Aarsand reports that VP is an autosomal dominant disorder and estimates that individuals with a predisposition for VP in the general population is 1/3,000 (except where founder effects occur e.g. South Africa). A rough estimate of the penetrance of pathogenic variants in this gene is given as 1%. Due to this low penetrance, genetic testing alone may be misleading and cause misdiagnosis. IPNET advises that VP is diagnosed using biochemical tests (urine porphobilinogen during an acute attack followed by plasma porphyrin fluorescence emission or if the patient only has cutaneous symptoms plasma porphyrin fluorescence emission) as the penetrance of variegate porphyria is so low
PMID: 37879139 Assaleh reports that biallelic VP is rare. To the best of our knowledge there are 25 patients (in 21 families) reported with homozygous VP (PMID: 40114189 Kaiser, 37879139 Assaleh, 33159949 Cho and references therein). It usually presents in infancy with severe cutaneous manifestations. In some cases, patients may have hand deformities, nystagmus, growth delay and intellectual disability.
Careful consideration should be given to the reporting of a single pathogenic variant as an incidental finding in the PPOX gene, due to its low clinical penetrance.; to: Relevant metabolic investigation: urine porphobilinogen and plasma porphyrin fluorescence emission
PMID: 38940544 Aarsand reports that the acute porphyrias are a group of rare inborn errors of metabolism caused by abnormal functioning of haem biosynthesis enzymes and are associated with acute neurovisceral attacks characterized by severe abdominal pain and neuropsychiatric symptoms that may require highly specialized intensive care. The acute porphyrias, acute intermittent porphyria (AIP), variegate porphyria (VP) and hereditary coproporphyria (HCP), usually become symptomatic in early adulthood.
PMID: 10486317 Whatley found that skin lesions were the only manifestation of VP in 59% of patients whereas 21% of patients had acute attacks and skin lesions. The remainder having only acute attacks.
PMID: 8290408 Hift reports that the cutaneous VP presents with photosensitivity which may result in blistering, erosions, a fragile skin with chronic scarring and pigmentary changes
PMID: 38940544 Aarsand reports that VP is an autosomal dominant disorder and estimates that individuals with a predisposition for VP in the general population is 1/3,000 (except where founder effects occur e.g. South Africa). A rough estimate of the penetrance of pathogenic variants in this gene is given as 1%. Due to this low penetrance, genetic testing alone may be misleading and cause misdiagnosis. IPNET advises that VP is diagnosed using biochemical tests (urine porphobilinogen during an acute attack followed by plasma porphyrin fluorescence emission or if the patient only has cutaneous symptoms plasma porphyrin fluorescence emission) as the penetrance of VP is so low
PMID: 37879139 Assaleh reports that biallelic VP is rare. To the best of our knowledge there are 25 patients (in 21 families) reported with homozygous VP (PMID: 40114189 Kaiser, 37879139 Assaleh, 33159949 Cho and references therein). It usually presents in infancy with severe cutaneous manifestations. In some cases, patients may have hand deformities, nystagmus, growth delay and intellectual disability.
Careful consideration should be given to the reporting of a single pathogenic variant as an incidental finding in the PPOX gene, due to its low clinical penetrance.
Undiagnosed metabolic disorders v1.607 PIGM Sarah Leigh Tag non-coding-known-pathogenic tag was added to gene: PIGM.
Undiagnosed metabolic disorders v1.607 PIGM Sarah Leigh changed review comment from: A single PIGM variant (NM_145167.2(PIGM):c.-270C>G) has been associated with Glycosylphosphatidylinositol deficiency, (OMIM:610293) and as limited Gen2Phen gene for the same condition.
To date, this variant has only been reported in people of Arab or Turkish descent. Microsatellite- and SNP-based haplotypes encompassing PIGM reported in PMID:19168132, suggested that a founder effect in the two families (one Arab and one Turkish) was unlikely. However, subsequent occurrences of the variant in two additional unrelated Arab families (PMID: 31445883) might suggest that this variant is confined within the Middle Eastern populations.
Functional studies have shown that this variant reduces transcription of PIGM and blocks mannosylation of glycosylphosphatidylinositol anchor (PMID: 16767100).; to: A single PIGM variant (NM_145167.2(PIGM):c.-270C>G)(rs587776528) has been associated with Glycosylphosphatidylinositol deficiency, (OMIM:610293) and as limited Gen2Phen gene for the same condition.
To date, this variant has only been reported in people of Arab or Turkish descent. Microsatellite- and SNP-based haplotypes encompassing PIGM reported in PMID:19168132, suggested that a founder effect in the two families (one Arab and one Turkish) was unlikely. However, subsequent occurrences of the variant in two additional unrelated Arab families (PMID: 31445883) might suggest that this variant is confined within the Middle Eastern populations.
Functional studies have shown that this variant reduces transcription of PIGM and blocks mannosylation of glycosylphosphatidylinositol anchor (PMID: 16767100).
Undiagnosed metabolic disorders v1.607 PIGM Sarah Leigh Classified gene: PIGM as Green List (high evidence)
Undiagnosed metabolic disorders v1.607 PIGM Sarah Leigh Gene: pigm has been classified as Green List (High Evidence).
Undiagnosed metabolic disorders v1.606 PIGM Sarah Leigh edited their review of gene: PIGM: Added comment: A single PIGM variant (NM_145167.2(PIGM):c.-270C>G) has been associated with Glycosylphosphatidylinositol deficiency, (OMIM:610293) and as limited Gen2Phen gene for the same condition.
To date, this variant has only been reported in people of Arab or Turkish descent. Microsatellite- and SNP-based haplotypes encompassing PIGM reported in PMID:19168132, suggested that a founder effect in the two families (one Arab and one Turkish) was unlikely. However, subsequent occurrences of the variant in two additional unrelated Arab families (PMID: 31445883) might suggest that this variant is confined within the Middle Eastern populations.
Functional studies have shown that this variant reduces transcription of PIGM and blocks mannosylation of glycosylphosphatidylinositol anchor (PMID: 16767100).; Changed rating: GREEN
Undiagnosed metabolic disorders v1.606 PIGM Sarah Leigh Publications for gene: PIGM were set to 27604308; 16767100; 25293775; 17442906
Undiagnosed metabolic disorders v1.605 PIGM Sarah Leigh Phenotypes for gene: PIGM were changed from Glycosylphosphatidylinositol deficiency 610293 to Glycosylphosphatidylinositol deficiency, OMIM:610293
Undiagnosed metabolic disorders v1.488 DHDDS Arina Puzriakova Phenotypes for gene: DHDDS were changed from Retinitis pigmentosa 59, OMIM:613861; ?Congenital disorder of glycosylation, type 1bb, OMIM:613861; Posterior segment abnormalities to Retinitis pigmentosa 59, OMIM:613861; ?Congenital disorder of glycosylation, type 1bb, OMIM:613861
Undiagnosed metabolic disorders v1.487 DHDDS Arina Puzriakova Phenotypes for gene: DHDDS were changed from Retinitis pigmentosa (other congenital disorders of glycosylation); Posterior segment abnormalities to Retinitis pigmentosa 59, OMIM:613861; ?Congenital disorder of glycosylation, type 1bb, OMIM:613861; Posterior segment abnormalities
Undiagnosed metabolic disorders v1.256 ABHD12 Sarah Leigh edited their review of gene: ABHD12: Added comment: Associated with phenotype in OMIM and not in Gen2Phen. At least 7 variants identified in at least 6 unrelated cases; Changed rating: GREEN; Changed publications: 27604308, 20797687, 24697911 ; Changed phenotypes: Polyneuropathy, hearing loss, ataxia, retinitis pigmentosa, and cataract 612674, Hereditary ataxia, Posterior segment abnormalities, Congenital hearing impairment (profound/severe), PHARC syndrome (Disorders of complex lipid synthesis)
Undiagnosed metabolic disorders v1.237 PIGM Sarah Leigh Classified gene: PIGM as Amber List (moderate evidence)
Undiagnosed metabolic disorders v1.237 PIGM Sarah Leigh Added comment: Comment on list classification: Associated with relevant phenotype in OMIM and as possible Gen2Phen gene. At least 1 variant was reported in 2 unrelated families (PMID 16767100), together with supportive functional studies (PMID 17442906 & 25293775).
Undiagnosed metabolic disorders v1.237 PIGM Sarah Leigh Gene: pigm has been classified as Amber List (Moderate Evidence).
Undiagnosed metabolic disorders v1.236 PIGM Sarah Leigh Publications for gene: PIGM were set to 27604308; 25293775; 16767100
Undiagnosed metabolic disorders v1.235 PIGM Sarah Leigh Added comment: Comment on phenotypes: Disorders of glycosphingolipid and glycosylphosphatidylinositol anchor glycosylation;Hypercoagulability syndrome due to glycosylphosphatidylinositol deficiency
Undiagnosed metabolic disorders v1.235 PIGM Sarah Leigh Phenotypes for gene: PIGM were changed from Phosphatidylinositolglycan, class M deficiency (Disorders of glycosphingolipid and glycosylphosphatidylinositol anchor glycosylation); Glycosylphosphatidylinositol deficiency 610293 to Glycosylphosphatidylinositol deficiency 610293
Undiagnosed metabolic disorders PIGM Ellen McDonagh commented on PIGM
Undiagnosed metabolic disorders PIGM Olivia Niblock reviewed PIGM