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Tubulin alpha-1A chain

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TUBA1A
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesTUBA1A, B-ALPHA-1, LIS3, TUBA3, tubulin alpha 1a
External IDsOMIM: 602529; MGI: 98869; HomoloGene: 68498; GeneCards: TUBA1A; OMA:TUBA1A - orthologs
Orthologs
SpeciesHumanMouse
Entrez

7846

22142

Ensembl

ENSG00000167552

ENSMUSG00000072235

UniProt

Q71U36

P68369

RefSeq (mRNA)

NM_006009
NM_001270399
NM_001270400

NM_011653

RefSeq (protein)

NP_001257328
NP_001257329
NP_006000

NP_035783

Location (UCSC)Chr 12: 49.18 – 49.19 MbChr 15: 98.85 – 98.85 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Tubulin alpha-1A chain is a protein that in humans is encoded by the TUBA1A gene.[5][6][7]

Tubulin alpha-1A chain is a type of alpha-tubulin involved in the formation of microtubules, which are structural proteins that play a role in the cytoskeletal structure. Microtubules are composed of heterodimers of alpha- and beta-tubulin molecules. Tubulin alpha-1A (TUBA1A) is a primary alpha-tubulin expressed in the human fetal brain, specifically found in that structure.[8]

Function

Microtubules of the eukaryotic cytoskeleton perform essential and diverse functions and are composed of a heterodimer of alpha and beta tubulins. The genes encoding these microtubule constituents belong to the tubulin superfamily, which is composed of six distinct families. Genes from the alpha, beta and gamma tubulin families are found in all eukaryotes. The alpha and beta tubulins represent the major components of microtubules, while gamma tubulin plays a critical role in the nucleation of microtubule assembly. There are multiple alpha and beta tubulin genes, which are highly conserved among species. This gene encodes alpha tubulin and is highly similar to mouse and rat Tuba1 gene. Northern blotting studies have shown that the gene expression is predominantly found in morphologically differentiated neurologic cells. This gene is one of three alpha-tubulin genes in a cluster on chromosome 12q.[7]

Alpha-tubulins, including TUBA1A, are involved in neuronal development and maturation. Studies have shown that the rat homologs of human TUBA1A, such as Tα1, exhibit elevated expression during the extension of neuronal processes. In experiments where pheochromocytoma cells were cultured with Nerve Growth Factor (NGF), differentiation and the development of neuronal processes were observed, accompanied by a significant increase in Tα1 mRNA expression, while T26 mRNA expression showed minimal change.[9]

TUBA1A is believed to play a role in neuronal migration by regulating microtubule dynamics, enabling the rapid formation and disassembly of polymers, which allows for the extension and retraction of processes necessary for nucleokinesis.[10]

RNA in situ hybridization studies demonstrated the expression of TUBA1A in mouse embryos. Embryonic day 16.5 sections showed strong labeling in the telencephalon, diencephalon, mesencephalon, developing cerebellum, brainstem, spinal cord, and dorsal root ganglia.[11]

Interactions

TUBA1A has been shown to interact with PAFAH1B1.[12]

Animal models

Keays et al. describe a mouse with a mutation of the TUBA1A gene induced by N-ethyl-N-nitrosourea. The relevant point mutation resulted in S140G;[13] the site of the mutation participates in the N-site of the formed α-tubulin, and participates in stabilizing the α-β tubulin polymer by binding GTP at this site.[14] The S140G mutation resulted in the formation of a “compromised GTP binding pocket”. Authors note defects associated with cortical layers II/III and IV, especially in cortical neuronal migration (with respect to wild-type counterparts), showing that the S140G mutation has value as a model for detailing disease associated with the Human TUBA homolog.[13]

Clinical significance

Mutations to the TUBA1A gene manifest clinically as Type 3 Lissencephaly. In general, lissencephaly is characterized by agyria (lacking of gyri and sulci to the brain – a smooth brain), seizure activity, failure to thrive, as well as intellectual disability and psychomotor retardation, often to a profound degree.[11] The symptoms of Lis3 Lissencephaly are not especially different from generalized lissencephaly (Lis1, related to PAFAH1B1). Diagnosis of lissencephaly generally is made from the symptom profile, while attribution to a specific type is obtained by microarray. Treatment is symptomatic; anti-convulsive drugs for seizure activity, g-button gastrostomy to feed the child, physical therapy for muscle disorders. TUBA1A mutation is common in microlissencephaly

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000167552 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000072235 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Crabtree DV, Ojima I, Geng X, Adler AJ (August 2001). "Tubulins in the primate retina: evidence that xanthophylls may be endogenous ligands for the paclitaxel-binding site". Bioorganic & Medicinal Chemistry. 9 (8): 1967–1976. doi:10.1016/S0968-0896(01)00103-1. PMID 11504633.
  6. ^ Hall JL, Cowan NJ (January 1985). "Structural features and restricted expression of a human alpha-tubulin gene". Nucleic Acids Research. 13 (1): 207–223. doi:10.1093/nar/13.1.207. PMC 340985. PMID 3839072.
  7. ^ a b "Entrez Gene: TUBA1A tubulin, alpha 1a".
  8. ^ Cowan NJ, Dobner PR, Fuchs EV, Cleveland DW (October 1983). "Expression of human alpha-tubulin genes: interspecies conservation of 3' untranslated regions". Molecular and Cellular Biology. 3 (10): 1738–1745. doi:10.1128/mcb.3.10.1738. PMC 370035. PMID 6646120.
  9. ^ Miller FD, Naus CC, Durand M, Bloom FE, Milner RJ (December 1987). "Isotypes of alpha-tubulin are differentially regulated during neuronal maturation". The Journal of Cell Biology. 105 (6 Pt 2): 3065–3073. doi:10.1083/jcb.105.6.3065. PMC 2114727. PMID 3693406.
  10. ^ Sakakibara A, Ando R, Sapir T, Tanaka T (July 2013). "Microtubule dynamics in neuronal morphogenesis". Open Biology. 3 (7): 130061. doi:10.1098/rsob.130061. PMC 3728923. PMID 23864552.
  11. ^ a b Poirier K, Keays DA, Francis F, Saillour Y, Bahi N, Manouvrier S, et al. (November 2007). "Large spectrum of lissencephaly and pachygyria phenotypes resulting from de novo missense mutations in tubulin alpha 1A (TUBA1A)". Human Mutation. 28 (11): 1055–1064. doi:10.1002/humu.20572. PMID 17584854. S2CID 22681290.
  12. ^ Sapir T, Elbaum M, Reiner O (December 1997). "Reduction of microtubule catastrophe events by LIS1, platelet-activating factor acetylhydrolase subunit". The EMBO Journal. 16 (23): 6977–6984. doi:10.1093/emboj/16.23.6977. PMC 1170301. PMID 9384577.
  13. ^ a b Keays DA, Tian G, Poirier K, Huang GJ, Siebold C, Cleak J, et al. (January 2007). "Mutations in alpha-tubulin cause abnormal neuronal migration in mice and lissencephaly in humans". Cell. 128 (1): 45–57. doi:10.1016/j.cell.2006.12.017. PMC 1885944. PMID 17218254.
  14. ^ Löwe J, Li H, Downing KH, Nogales E (November 2001). "Refined structure of alpha beta-tubulin at 3.5 A resolution". Journal of Molecular Biology. 313 (5): 1045–1057. doi:10.1006/jmbi.2001.5077. PMID 11700061.

Further reading

  • Overview of all the structural information available in the PDB for UniProt: Q71U36 (Human Tubulin alpha-1A chain) at the PDBe-KB.
  • Overview of all the structural information available in the PDB for UniProt: P68369 (Mouse Tubulin alpha-1A chain) at the PDBe-KB.
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