Hypoparathyroidism
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Inheritance
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Gene mutation
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Clinical features
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Autoimmune[1]
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Autoimmune polyglandular hypoparathyroidism
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Autoimmune polyglandular endocrinopathy type 1
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Autosomal recessive disease
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Mutation in AIRE gene
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- Also known as autosomal recessive disease called autoimmune polyendocrinopathy-candidiasis-ectodermal dystrophy (APECED).
- Presents with a variable combination of:
- Failure of the parathyroid glands, adrenal cortex, gonads, pancreatic beta cells, gastric parietal cells, and thyroid gland, and hepatitis
- Chronic mucocutaneous candidiasis
- Dystrophy of dental enamel and nails, alopecia, vitiligo, and keratopath
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Isolated
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Familial Isolated hypoparathyroidism
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Autosomal dominant
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PTH gene
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GCM2 gene
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Autosomal recessive
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PTH gene[2]
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GCM2 gene[3][4]
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X-linked
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FHL1 gene (exon 4, c.C283T, p.R95W) on chromosome locus Xq26-q27.[5]
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Autosomal dominant hypercalcemia[6]
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Autosomal dominant hypocalcemia type 1
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Autosomal dominant
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Calcium-sensing receptor gene mutation
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- Calcium-sensing receptor gene activating mutation.
- Most common genetic form of hypoparathyroidism.
- Also known as familial hypercalciuric hypocalcemia.
- The activating mutation results in gain in function.
- Calcium-sensing receptor gene activating mutation can also cause Bartter syndrome type 5.This mutation cause the inhibition of apical potassium channel in the thick ascending limb of the loop of Henle in the kidney.[7][8]
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Autosomal dominant hypocalcemia type 2
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Autosomal dominant
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G protein G11 (GNA11) mutation
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Congenital multisystem syndromes
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DiGeorge syndrome[9]
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Autosomal dominant
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22q11.2 deletion.
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- Also known as 22q11.2DS, CATCH 22 syndrome, Cayler cardiofacial syndrome, conotruncal anomaly face syndrome (CTAF), deletion 22q11.2 syndrome, Sedlackova syndrome, Shprintzen syndrome, VCFS, velocardiofacial syndrome, and velo-cardio-facial syndrome.
- CATCH 22 stands for cardiac defects, abnormal facies, thymic aplasia, cleft palate, and hypocalcemia with 22q11.2 deletion.
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CHARGE syndrome[10]
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Autosomal dominant
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CHD7 G744S missense mutation
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Kenny-Caffey syndrome type 1[11]
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Autosomal recessive
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Deletion of the TBCE gene
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- Presents with hypoparathyroidism due to absent parathyroid tissue, growth retardation, medullary stenosis of tubular bones.
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Kenny-Caffey syndrome type 2[12]
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Autosomal dominant
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Mutation of “family with sequence similarity 111, member A″ (FAM111A) gene located on chromosome locus 11q12.1
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- Patients with Kenny-Caffey sundrome type 2 have same clinical features as Kenny-Caffey syndrome type 1 except for mental retardation.
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Sanjad-Sakati syndrome[13]
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Autosomal recessive
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Mutation in TBCE gene.
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Barakat syndrome[14][15]
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Autosomal recessive
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Mutations in the GATA3 gene
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- Also known as hypoparathyroidism, deafness, and renal dysplasia (HDR) syndrome
- Presents with primary hypoparathyroidism, nerve deafness, steroid-resistant nephrosis.
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Metabolic diseases
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Mitochondiral polyneuropathies[16]
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Kearns–Sayre syndrome
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Mitochondrial inheritence
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mtDNA deletion
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- Progressive external ophthalmoplegia
- Retinitis pigmentosa
- Cardiomyopathy,
- Heart block
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Maternally inherited diabetes and deafness (MIDD)
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Mitochondrial inheritence
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MT‑TL1
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- Diabetes mellitus and deafness
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Mitochondrial enzyme deficiencies
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Mitochondrial trifunctional protein deficiency (MTP deficiency)[17]
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Long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency (LCHAD deficiency)[18]
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Autosomal recessive
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G1528C mutation
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- Hypoglycemia
- Hepatopathy
- Hypotonia
- Cardiomyopathy,
- Retinopathy
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Heavy metal storage disorders
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Hemochromatosis[19]
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Wilson's disease[20]
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