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Pathway Description
Lactose Intolerance
Homo sapiens
Disease Pathway
Created: 2022-12-20
Last Updated: 2023-10-25
Lactose intolerance is a condition in which the body does not support the ingestion of lactose through the consumption of milk, cheese, and other dairy products. This intolerance occurs due to the lack of the enzyme intestinal lactase, which is an enzyme found in newborns. The frequency of this enzyme declines rapidly after the child stops breastfeeding. Lactase deficiency is most prevalent in Asia, Africa and Indigenous populations in North and South America. The symptoms of lactose intolerance include diarrhea, bloating, abdominal pain and excessive flatus. The cause of these symptoms is the processing of the ingested lactose being fermented by intestinal bacteria instead of in the small intestine, where lactose is meant to be processed.
References
Lactose Intolerance References
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Pubmed: 26715083
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Pubmed: 1916106
Mantei N, Villa M, Enzler T, Wacker H, Boll W, James P, Hunziker W, Semenza G: Complete primary structure of human and rabbit lactase-phlorizin hydrolase: implications for biosynthesis, membrane anchoring and evolution of the enzyme. EMBO J. 1988 Sep;7(9):2705-13.
Pubmed: 2460343
Boll W, Wagner P, Mantei N: Structure of the chromosomal gene and cDNAs coding for lactase-phlorizin hydrolase in humans with adult-type hypolactasia or persistence of lactase. Am J Hum Genet. 1991 May;48(5):889-902.
Pubmed: 1902057
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Pubmed: 2430951
Ruiz A, Bhat SP, Bok D: Characterization and quantification of full-length and truncated Na,K-ATPase alpha 1 and beta 1 RNA transcripts expressed in human retinal pigment epithelium. Gene. 1995 Apr 3;155(2):179-84. doi: 10.1016/0378-1119(94)00812-7.
Pubmed: 7536695
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Pubmed: 14702039
Vanmolkot KR, Kors EE, Hottenga JJ, Terwindt GM, Haan J, Hoefnagels WA, Black DF, Sandkuijl LA, Frants RR, Ferrari MD, van den Maagdenberg AM: Novel mutations in the Na+, K+-ATPase pump gene ATP1A2 associated with familial hemiplegic migraine and benign familial infantile convulsions. Ann Neurol. 2003 Sep;54(3):360-6. doi: 10.1002/ana.10674.
Pubmed: 12953268
De Fusco M, Marconi R, Silvestri L, Atorino L, Rampoldi L, Morgante L, Ballabio A, Aridon P, Casari G: Haploinsufficiency of ATP1A2 encoding the Na+/K+ pump alpha2 subunit associated with familial hemiplegic migraine type 2. Nat Genet. 2003 Feb;33(2):192-6. doi: 10.1038/ng1081. Epub 2003 Jan 21.
Pubmed: 12539047
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Pubmed: 15174025
Heinzen EL, Swoboda KJ, Hitomi Y, Gurrieri F, Nicole S, de Vries B, Tiziano FD, Fontaine B, Walley NM, Heavin S, Panagiotakaki E, Fiori S, Abiusi E, Di Pietro L, Sweney MT, Newcomb TM, Viollet L, Huff C, Jorde LB, Reyna SP, Murphy KJ, Shianna KV, Gumbs CE, Little L, Silver K, Ptacek LJ, Haan J, Ferrari MD, Bye AM, Herkes GK, Whitelaw CM, Webb D, Lynch BJ, Uldall P, King MD, Scheffer IE, Neri G, Arzimanoglou A, van den Maagdenberg AM, Sisodiya SM, Mikati MA, Goldstein DB: De novo mutations in ATP1A3 cause alternating hemiplegia of childhood. Nat Genet. 2012 Sep;44(9):1030-4. doi: 10.1038/ng.2358. Epub 2012 Jul 29.
Pubmed: 22842232
Ishii A, Saito Y, Mitsui J, Ishiura H, Yoshimura J, Arai H, Yamashita S, Kimura S, Oguni H, Morishita S, Tsuji S, Sasaki M, Hirose S: Identification of ATP1A3 mutations by exome sequencing as the cause of alternating hemiplegia of childhood in Japanese patients. PLoS One. 2013;8(2):e56120. doi: 10.1371/journal.pone.0056120. Epub 2013 Feb 8.
Pubmed: 23409136
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Pubmed: 24468074
Keryanov S, Gardner KL: Physical mapping and characterization of the human Na,K-ATPase isoform, ATP1A4. Gene. 2002 Jun 12;292(1-2):151-66. doi: 10.1016/s0378-1119(02)00647-9.
Pubmed: 12119109
Hlivko JT, Chakraborty S, Hlivko TJ, Sengupta A, James PF: The human Na,K-ATPase alpha 4 isoform is a ouabain-sensitive alpha isoform that is expressed in sperm. Mol Reprod Dev. 2006 Jan;73(1):101-15. doi: 10.1002/mrd.20383.
Pubmed: 16175638
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Pubmed: 16710414
Kawakami K, Nojima H, Ohta T, Nagano K: Molecular cloning and sequence analysis of human Na,K-ATPase beta-subunit. Nucleic Acids Res. 1986 Apr 11;14(7):2833-44. doi: 10.1093/nar/14.7.2833.
Pubmed: 3008098
Lane LK, Shull MM, Whitmer KR, Lingrel JB: Characterization of two genes for the human Na,K-ATPase beta subunit. Genomics. 1989 Oct;5(3):445-53.
Pubmed: 2559024
Hernando N, Martin-Vasallo P, Ghosh S, Ghosh PK, Swaroop A, Coca-Prados M: Nucleotide sequence of a cDNA for the beta 2 subunit isoform of Na+,K(+)-ATPase from human retina. Biochim Biophys Acta. 1994 Jan 3;1189(1):109-11. doi: 10.1016/0005-2736(94)90287-9.
Pubmed: 8305453
Ruiz A, Bhat SP, Bok D: Expression and synthesis of the Na,K-ATPase beta 2 subunit in human retinal pigment epithelium. Gene. 1996 Oct 17;176(1-2):237-42. doi: 10.1016/0378-1119(96)00258-2.
Pubmed: 8918259
Avila J, Alvarez de la Rosa D, Gonzalez-Martinez LM, Lecuona E, Martin-Vasallo P: Structure and expression of the human Na,K-ATPase beta 2-subunit gene. Gene. 1998 Feb 27;208(2):221-7. doi: 10.1016/s0378-1119(97)00661-6.
Pubmed: 9524271
Malik N, Canfield VA, Beckers MC, Gros P, Levenson R: Identification of the mammalian Na,K-ATPase 3 subunit. J Biol Chem. 1996 Sep 13;271(37):22754-8. doi: 10.1074/jbc.271.37.22754.
Pubmed: 8798450
Malik N, Canfield V, Sanchez-Watts G, Watts AG, Scherer S, Beatty BG, Gros P, Levenson R: Structural organization and chromosomal localization of the human Na,K-ATPase beta 3 subunit gene and pseudogene. Mamm Genome. 1998 Feb;9(2):136-43.
Pubmed: 9457675
Sweadner KJ, Wetzel RK, Arystarkhova E: Genomic organization of the human FXYD2 gene encoding the gamma subunit of the Na,K-ATPase. Biochem Biophys Res Commun. 2000 Dec 9;279(1):196-201. doi: 10.1006/bbrc.2000.3907.
Pubmed: 11112438
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Pubmed: 9048881
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Pubmed: 11062458
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