|Forkhead box P2|
PDB rendering based on 2a07.
|Symbols||; CAGH44; SPCH1; TNRC10|
|RNA expression pattern|
Forkhead box protein P2 (FOXP2) is a protein that, in humans, is encoded by the FOXP2 gene, also known as CAGH44, SPCH1 or TNRC10, and is required for proper development of speech and language. Initially identified as the genetic factor of speech disorder in KE family, its gene is the first gene discovered associated with speech and language. The gene is located on chromosome 7 (7q31, at the SPCH1 locus), and is expressed in fetal and adult brain, heart, lung and gut. FOXP2 orthologs have also been identified in other mammals for which complete genome data are available. The FOXP2 protein contains a forkhead-box DNA-binding domain, making it a member of the FOX group of transcription factors, involved in regulation of gene expression. In addition to this characteristic forkhead-box domain, the protein contains a polyglutamine tract, a zinc finger and a leucine zipper. The gene is more active in females than in males, to which could be attributed better language learning in females.
In humans, mutations of FOXP2 cause a severe speech and language disorder. Versions of FOXP2 exist in similar forms in distantly related vertebrates; functional studies of the gene in mice and in songbirds indicate that it is important for modulating plasticity of neural circuits. Outside the brain FOXP2 has also been implicated in development of other tissues such as the lung and gut.
FOXP2 is popularly dubbed the "language gene", but this is only partly correct since there are other genes involved in language development. It directly regulates a number of other genes, including CNTNAP2, CTBP1, and SRPX2.
Two amino acid substitutions distinguish the human FOXP2 protein from that found in chimpanzees, but only one of these two changes is unique to humans. Evidence from genetically manipulated mice and human neuronal cell models suggests that these changes affect the neural functions of FOXP2.
FOXP2 and its gene were discovered as a result of investigations on an English family known as the KE family, half of whom (fifteen individuals across three generations) suffered from a speech and language disorder called developmental verbal dyspraxia. Their case was studied at the Institute of Child Health of University London College. In 1990 Myrna Gopnik, Professor of Linguistics at McGill University, reported that the disorder-affected KE family had severe speech impediment with incomprehensible talk, largely characterized by grammatical deficits. She hypothesized that the basis was not of learning or cognitive disability, but due to genetic factors affecting mainly grammatical ability. (Her hypothesis led to a popularised existence of "grammar gene" and a controversial notion of grammar-specific disorder.) In 1995, the University of Oxford and the Institute of Child Health researchers found that the disorder was purely genetic. Remarkably, the inheritance of the disorder from one generation to the next was consistent with autosomal dominant inheritance, i.e., mutation of only a single gene on an autosome (non-sex chromosome) acting in a dominant fashion. This is one of the few known examples of Mendelian (monogenic) inheritance for a disorder affecting speech and language skills, which typically have a complex basis involving multiple genetic risk factors.
In 1998, Oxford University geneticists Simon Fisher, Anthony Monaco, Cecilia S. L. Lai, Jane A. Hurst, and Faraneh Vargha-Khadem identified an autosomal dominant monogenic inheritance that is localized on a small region of chromosome 7 from DNA samples taken from the affected and unaffected members. The chromosomal region (locus) contained 70 genes. The locus was given the official name "SPCH1" (for speech-and-language-disorder-1) by the Human Genome Nomenclature committee. Mapping and sequencing of the chromosomal region was performed with the aid of bacterial artificial chromosome clones. Around this time, the researchers identified an individual who was unrelated to the KE family, but had a similar type of speech and language disorder. In this case the child, known as CS, carried a chromosomal rearrangement (a translocation) in which part of chromosome 7 had become exchanged with part of chromosome 5. The site of breakage of chromosome 7 was located within the SPCH1 region.
In 2001, the team identified in CS that the mutation is in the middle of a protein-coding gene. Using a combination of bioinformatics and RNA analyses, they discovered that the gene codes for a novel protein belonging to the forkhead-box (FOX) group of transcription factors. As such, it was assigned with the official name of FOXP2. When the researchers sequenced the FOXP2 gene in the KE family, they found a heterozygous point mutation shared by all the affected individuals, but not in unaffected members of the family and other people. This mutation is due to an amino-acid substitution that inhibits the DNA-binding domain of the FOXP2 protein. Further screening of the gene identified multiple additional cases of FOXP2 disruption, including different point mutations and chromosomal rearrangements, providing evidence that damage to one copy of this gene is sufficient to derail speech and language development.
FOXP2 is required for proper brain and lung development. Knockout mice with only one functional copy of the FOXP2 gene have significantly reduced vocalizations as pups. Knockout mice with no functional copies of FOXP2 are runted, display abnormalities in brain regions such as the Purkinje layer, and die an average of 21 days after birth from inadequate lung development.
A knockout mouse model has been used to examine FOXP2’s role in brain development and how mutations in the two copies of FOXP2 affect vocalization. Mutations in one copy result in reduced speech while abnormalities in both copies cause major brain and lung developmental issues.
There are several abnormalities linked to FOXP2. The most common mutation results in severe speech impairment known as developmental verbal dyspraxia which is caused by a translocation in the 7q31.2 region [t(5;7)(q22;q31.2)]. A missense mutation causing an arginine-to-histidine substitution (R553H) in the DNA-binding domain is thought to be the abnormality in KE. A heterozygous nonsense mutation, R328X variant, produces a truncated protein involved in speech and language difficulties in an individual and two of their close family members. R553H and R328X mutations also affected nuclear localization, DNA-binding, and the transactivation (increased gene expression) properties of FOXP2. Although DVD associated with FOXP2 disruptions are thought to be rare (~2% by one estimate), a faulty copy of FOXP2 in individuals always causes speech and language problems.
Several cases of developmental verbal dyspraxia in humans have been linked to mutations in the FOXP2 gene. Such individuals have little or no cognitive handicaps but are unable to correctly perform the coordinated movements required for speech. fMRI analysis of these individuals performing silent verb generation and spoken word repetition tasks showed underactivation of Broca's area and the putamen, brain centers thought to be involved in language tasks. Because of this, FOXP2 has been dubbed the "language gene". People with this mutation also experience symptoms not related to language (not surprisingly, as FOXP2 is known to affect development in other parts of the body as well). Scientists have also looked for associations between FOXP2 and autism, and both positive and negative findings have been reported.
There is some evidence that the linguistic impairments associated with a mutation of the FOXP2 gene are not simply the result of a fundamental deficit in motor control. For examples, the impairments include difficulties in comprehension. Brain imaging of affected individuals indicates functional abnormalities in language-related cortical and basal/ganglia regions, demonstrating that the problems extend beyond the motor system.
The FOXP2 gene is highly conserved in mammals. Human gene differs from non-human primates by the substitution of two amino acids, threonine to asparagine substitution at position 303 (T303N) and asparagine to serine substitution at position 325 (N325S). In mice it differs from that of humans by three substitutions, and in zebra finch by seven amino acids. One of the two amino acid difference between human and chimps also arose independently in carnivores and bats. Similar FOXP2 proteins can be found in songbirds, fish, and reptiles such as alligators.
The FOXP2 gene showed indications of recent positive selection. Some researchers have speculated that positive selection is crucial for the evolution of language in humans. Others, however, have been unable to find a clear association between species with learned vocalizations and similar mutations in FOXP2. Insertion of both human mutations into mice, whose version of FOXP2 otherwise differs from the human and chimpanzee versions in only one additional base pair, causes changes in vocalizations as well as other behavioral changes, such as a reduction in exploratory tendencies. A reduction in dopamine levels and changes in the morphology of certain nerve cells are also observed.
However, FOXP2 is extremely diverse in echolocating bats. Twenty-two sequences of non-bat eutherian mammals revealed a total number of 20 nonsynonymous mutations in contrast to half that number of bat sequences, which showed 44 nonsynonymous mutations. Interestingly, all cetaceans share three amino acid substitutions, but there are not differences between echolocating and non-echolocating baleen cetaceans. Within bats, however, amino acid variation correlated with different echolocating types.
FOXP2 interacts with a regulatory gene CTBP1. It also downregulates CNTNAP2 gene, a member of the neurexin family found in neurons. The target gene is associated with common forms of language impairment. It regulates the repeat-containing protein X-linked 2 (SRPX2), which is an epilepsy and language-associated gene in humans, and sound-controlling gene in mice.
In a mouse FOXP2 knockout study, loss of both copies of the gene caused severe motor impairment related to cerebellar abnormalities and lack of ultrasonic vocalisations normally elicited when pups are removed from their mothers. These vocalizations have important communicative roles in mother-offspring interactions. Loss of one copy was associated with impairment of ultrasonic vocalisations and a modest developmental delay. Male mice on encountering female mice produce complex ultrasonic vocalisations that have characteristics of song. Mice that have the R552H point mutation carried by the KE family show cerebellar reduction and abnormal synaptic plasticity in striatal and cerebellar circuits.
In songbirds, such as parrots and hummingbirds, FOXP2 most likely regulates genes involved in neuroplasticity. Gene knockdown of FOXP2 in Area X of the basal ganglia in songbirds results in incomplete and inaccurate song imitation. Similarly, in adult canaries higher FOXP2 levels also correlate with song changes. Levels of FOXP2 in adult zebra finches are significantly higher when males direct their song to females than when they sing song in other contexts. Differences between song-learning and non-song-learning birds have been shown to be caused by differences in FOXP2 gene expression, rather than differences in the amino acid sequence of the FOXP2 protein. Knockout of FOXP2 reduced dendritic spines of spiny neurons in Area X which was even more pronounced when knockout occurred before they differentiated into spiny neurons.
- Lai CS, Fisher SE, Hurst JA, Vargha-Khadem F, Monaco AP (2001). "A forkhead-domain gene is mutated in a severe speech and language disorder". Nature 413 (6855): 519–23. doi:10.1038/35097076. PMID 11586359.
- Nudel R, Newbury DF (2013). "FOXP2". Wiley Interdiscip Rev Cogn Sci 4 (5): 547–560. doi:10.1002/wcs.1247. PMC 3992897. PMID 24765219.
- Fisher SE, Vargha-Khadem F, Watkins KE, Monaco AP, Pembrey ME (1998). "Localisation of a gene implicated in a severe speech and language disorder". Nat. Genet. 18 (2): 168–70. doi:10.1038/ng0298-168. PMID 9462748.
- Lai CS, Fisher SE, Hurst JA, Levy ER, Hodgson S, Fox M, Jeremiah S, Povey S, Jamison DC, Green ED, Vargha-Khadem F, Monaco AP (2000). "The SPCH1 region on human 7q31: genomic characterization of the critical interval and localization of translocations associated with speech and language disorder". Am. J. Hum. Genet. 67 (2): 357–68. doi:10.1086/303011. PMC 1287211. PMID 10880297.
- "OrthoMaM phylogenetic marker: FOXP2 coding sequence".
- Pennisi, Elizabeth (31 October 2013). "'Language Gene' Has a Partner". Science. Retrieved 30 October 2014.
- MacDermot KD, Bonora E, Sykes N, Coupe AM, Lai CS, Vernes SC, Vargha-Khadem F, McKenzie F, Smith RL, Monaco AP, Fisher SE (2005). "Identification of FOXP2 truncation as a novel cause of developmental speech and language deficits". Am. J. Hum. Genet. 76 (6): 1074–80. doi:10.1086/430841. PMC 1196445. PMID 15877281.
- Groszer M, Keays DA, Deacon RM, de Bono JP, Prasad-Mulcare S, Gaub S, Baum MG, French CA, Nicod J, Coventry JA, Enard W, Fray M, Brown SD, Nolan PM, Pääbo S, Channon KM, Costa RM, Eilers J, Ehret G, Rawlins JN, Fisher SE (2008). "Impaired synaptic plasticity and motor learning in mice with a point mutation implicated in human speech deficits". Curr. Biol. 18 (5): 354–62. doi:10.1016/j.cub.2008.01.060. PMC 2917768. PMID 18328704.
- Haesler S, Rochefort C, Georgi B, Licznerski P, Osten P, Scharff C (2007). "Incomplete and inaccurate vocal imitation after knockdown of FoxP2 in songbird basal ganglia nucleus Area X". PLoS Biol. 5 (12): e321. doi:10.1371/journal.pbio.0050321. PMC 2100148. PMID 18052609.
- Fisher SE, Scharff C (2009). "FOXP2 as a molecular window into speech and language". Trends Genet. 25 (4): 166–77. doi:10.1016/j.tig.2009.03.002. PMID 19304338.
- Shu W, Lu MM, Zhang Y, Tucker PW, Zhou D, Morrisey EE (2007). "Foxp2 and Foxp1 cooperatively regulate lung and esophagus development". Development 134 (10): 1991–2000. doi:10.1242/dev.02846. PMID 17428829.
- Harpaz, Yehouda. "Language gene found". human-brain.org. Retrieved 31 October 2014.
- Spiteri E, Konopka G, Coppola G, Bomar J, Oldham M, Ou J, Vernes SC, Fisher SE, Ren B, Geschwind DH (2007). "Identification of the transcriptional targets of FOXP2, a gene linked to speech and language, in developing human brain". Am. J. Hum. Genet. 81 (6): 1144–57. doi:10.1086/522237. PMC 2276350. PMID 17999357.
- Vernes SC, Spiteri E, Nicod J, Groszer M, Taylor JM, Davies KE, Geschwind DH, Fisher SE (2007). "High-throughput analysis of promoter occupancy reveals direct neural targets of FOXP2, a gene mutated in speech and language disorders". Am. J. Hum. Genet. 81 (6): 1232–50. doi:10.1086/522238. PMC 2276341. PMID 17999362.
- Enard W, Przeworski M, Fisher SE, Lai CS, Wiebe V, Kitano T, Monaco AP, Pääbo S (2002). "Molecular evolution of FOXP2, a gene involved in speech and language". Nature 418 (6900): 869–72. doi:10.1038/nature01025. PMID 12192408.
- Enard W, Gehre S, Hammerschmidt K, Hölter SM, Blass T, Somel M, Brückner MK, Schreiweis C, Winter C, Sohr R, Becker L, Wiebe V, Nickel B, Giger T, Müller U, Groszer M, Adler T, Aguilar A, Bolle I, Calzada-Wack J, Dalke C, Ehrhardt N, Favor J, Fuchs H, Gailus-Durner V, Hans W, Hölzlwimmer G, Javaheri A, Kalaydjiev S, Kallnik M, Kling E, Kunder S, Mossbrugger I, Naton B, Racz I, Rathkolb B, Rozman J, Schrewe A, Busch DH, Graw J, Ivandic B, Klingenspor M, Klopstock T, Ollert M, Quintanilla-Martinez L, Schulz H, Wolf E, Wurst W, Zimmer A, Fisher SE, Morgenstern R, Arendt T, de Angelis MH, Fischer J, Schwarz J, Pääbo S (2009). "A humanized version of Foxp2 affects cortico-basal ganglia circuits in mice". Cell 137 (5): 961–71. doi:10.1016/j.cell.2009.03.041. PMID 19490899.
- Konopka G, Bomar JM, Winden K, Coppola G, Jonsson ZO, Gao F, Peng S, Preuss TM, Wohlschlegel JA, Geschwind DH (2009). "Human-specific transcriptional regulation of CNS development genes by FOXP2". Nature 462 (7270): 213–7. doi:10.1038/nature08549. PMC 2778075. PMID 19907493.
- Hurst JA, Baraitser M, Auger E, Graham F, Norell S (1990). "An extended family with a dominantly inherited speech disorder". Dev Med Child Neurol 32 (4): 352–5. doi:10.1111/j.1469-8749.1990.tb16948.x. PMID 2332125.
- Gopnik M (1990). "Genetic basis of grammar defect". Nature 347 (6288): 26. doi:10.1038/347026a0. PMID 2395458.
- Gopnik M (1990). "Feature-blind grammar and dysphagia". Nature 344 (6268): 715. doi:10.1038/344715a0. PMID 2330028.
- Cowie, Fiona (1999). What's Within?: Nativism Reconsidered. New York, US: Oxford University Press. pp. 290–291. ISBN 978-0-1951-5978-3.
- Jenkins, Lyle (2000). Biolinguistics: Exploring the Biology of Language (Revised ed.). Cambridge, UK: Cambridge University Press. pp. 98–99. ISBN 978-0-5210-0391-9.
- Vargha-Khadem F, Watkins K, Alcock K, Fletcher P, Passingham R (1995). "Praxic and nonverbal cognitive deficits in a large family with a genetically transmitted speech and language disorder". Proc. Natl. Acad. Sci. U.S.A. 92 (3): 930–3. doi:10.1073/pnas.92.3.930. PMC 42734. PMID 7846081.
- Fisher SE, Lai CS, Monaco AP (2003). "Deciphering the genetic basis of speech and language disorders". Annu. Rev. Neurosci. 26: 57–80. doi:10.1146/annurev.neuro.26.041002.131144. PMID 12524432.
- "Genes that are essential for speech". The Brain from Top to Bottom. Retrieved 31 October 2014.
- Vernes SC, Nicod J, Elahi FM, Coventry JA, Kenny N, Coupe AM, Bird LE, Davies KE, Fisher SE (2006). "Functional genetic analysis of mutations implicated in a human speech and language disorder" (PDF). Hum. Mol. Genet. 15 (21): 3154–67. doi:10.1093/hmg/ddl392. PMID 16984964.
- Feuk L, Kalervo A, Lipsanen-Nyman M, Skaug J, Nakabayashi K, Finucane B, Hartung D, Innes M, Kerem B, Nowaczyk MJ, Rivlin J, Roberts W, Senman L, Summers A, Szatmari P, Wong V, Vincent JB, Zeesman S, Osborne LR, Cardy JO, Kere J, Scherer SW, Hannula-Jouppi K (2006). "Absence of a paternally inherited FOXP2 gene in developmental verbal dyspraxia". Am. J. Hum. Genet. 79 (5): 965–72. doi:10.1086/508902. PMC 1698557. PMID 17033973.
- Shu W, Cho JY, Jiang Y, Zhang M, Weisz D, Elder GA, Schmeidler J, De Gasperi R, Sosa MA, Rabidou D, Santucci AC, Perl D, Morrisey E, Buxbaum JD (2005). "Altered ultrasonic vocalization in mice with a disruption in the Foxp2 gene". Proc. Natl. Acad. Sci. U.S.A. 102 (27): 9643–8. doi:10.1073/pnas.0503739102. PMC 1160518. PMID 15983371.
- Clovis YM, Enard W, Marinaro F, Huttner WB, De Pietri Tonelli D (2012). "Convergent repression of Foxp2 3'UTR by miR-9 and miR-132 in embryonic mouse neocortex: implications for radial migration of neurons". Development 139 (18): 3332–42. doi:10.1242/dev.078063. PMID 22874921.
- Preuss TM (2012). "Human brain evolution: from gene discovery to phenotype discovery". Proc. Natl. Acad. Sci. U.S.A. 109 Suppl 1 (Suppl 1): 10709–16. doi:10.1073/pnas.1201894109. PMC 3386880. PMID 22723367.
- Vernes SC, Nicod J, Elahi FM, Coventry JA, Kenny N, Coupe AM, Bird LE, Davies KE, Fisher SE (2006). "Functional genetic analysis of mutations implicated in a human speech and language disorder". Hum. Mol. Genet. 15 (21): 3154–67. doi:10.1093/hmg/ddl392. PMID 16984964.
- Tanabe Y, Fujita E, Momoi T (2011). "FOXP2 promotes the nuclear translocation of POT1, but FOXP2(R553H), mutation related to speech-language disorder, partially prevents it". Biochem. Biophys. Res. Commun. 410 (3): 593–6. doi:10.1016/j.bbrc.2011.06.032. PMID 21684252.
- Shriberg LD, Ballard KJ, Tomblin JB, Duffy JR, Odell KH, Williams CA (2006). "Speech, prosody, and voice characteristics of a mother and daughter with a 7;13 translocation affecting FOXP2". J. Speech Lang. Hear. Res. 49 (3): 500–25. doi:10.1044/1092-4388(2006/038). PMID 16787893.
- Zeesman S, Nowaczyk MJ, Teshima I, Roberts W, Cardy JO, Brian J, Senman L, Feuk L, Osborne LR, Scherer SW (2006). "Speech and language impairment and oromotor dyspraxia due to deletion of 7q31 that involves FOXP2". Am. J. Med. Genet. A 140 (5): 509–14. doi:10.1002/ajmg.a.31110. PMID 16470794.
- Vargha-Khadem F, Gadian DG, Copp A, Mishkin M (2005). "FOXP2 and the neuroanatomy of speech and language". Nat. Rev. Neurosci. 6 (2): 131–8. doi:10.1038/nrn1605. PMID 15685218.
- Carroll SB (2005). "Evolution at two levels: on genes and form". PLoS Biol. 3 (7): e245. doi:10.1371/journal.pbio.0030245. PMC 1174822. PMID 16000021.
- Scherer SW, Cheung J, MacDonald JR, Osborne LR, Nakabayashi K, Herbrick JA, Carson AR, Parker-Katiraee L, Skaug J, Khaja R, Zhang J, Hudek AK, Li M, Haddad M, Duggan GE, Fernandez BA, Kanematsu E, Gentles S, Christopoulos CC, Choufani S, Kwasnicka D, Zheng XH, Lai Z, Nusskern D, Zhang Q, Gu Z, Lu F, Zeesman S, Nowaczyk MJ, Teshima I, Chitayat D, Shuman C, Weksberg R, Zackai EH, Grebe TA, Cox SR, Kirkpatrick SJ, Rahman N, Friedman JM, Heng HH, Pelicci PG, Lo-Coco F, Belloni E, Shaffer LG, Pober B, Morton CC, Gusella JF, Bruns GA, Korf BR, Quade BJ, Ligon AH, Ferguson H, Higgins AW, Leach NT, Herrick SR, Lemyre E, Farra CG, Kim HG, Summers AM, Gripp KW, Roberts W, Szatmari P, Winsor EJ, Grzeschik KH, Teebi A, Minassian BA, Kere J, Armengol L, Pujana MA, Estivill X, Wilson MD, Koop BF, Tosi S, Moore GE, Boright AP, Zlotorynski E, Kerem B, Kroisel PM, Petek E, Oscier DG, Mould SJ, Döhner H, Döhner K, Rommens JM, Vincent JB, Venter JC, Li PW, Mural RJ, Adams MD, Tsui LC (2003). "Human chromosome 7: DNA sequence and biology". Science 300 (5620): 767–72. doi:10.1126/science.1083423. PMC 2882961. PMID 12690205.
- Newbury DF, Bonora E, Lamb JA, Fisher SE, Lai CS, Baird G, Jannoun L, Slonims V, Stott CM, Merricks MJ, Bolton PF, Bailey AJ, Monaco AP (2002). "FOXP2 is not a major susceptibility gene for autism or specific language impairment". Am. J. Hum. Genet. 70 (5): 1318–27. doi:10.1086/339931. PMC 447606. PMID 11894222.
- Enard W, Przeworski M, Fisher SE, Lai CS, Wiebe V, Kitano T, Monaco AP, Pääbo S (2002). "Molecular evolution of FOXP2, a gene involved in speech and language" (PDF). Nature 418 (6900): 869–72. doi:10.1038/nature01025. PMID 12192408.
- Teramitsu I, Kudo LC, London SE, Geschwind DH, White SA (2004). "Parallel FoxP1 and FoxP2 expression in songbird and human brain predicts functional interaction". J. Neurosci. 24 (13): 3152–63. doi:10.1523/JNEUROSCI.5589-03.2004. PMID 15056695.
- Haesler S, Wada K, Nshdejan A, Morrisey EE, Lints T, Jarvis ED, Scharff C (2004). "FoxP2 expression in avian vocal learners and non-learners". J. Neurosci. 24 (13): 3164–75. doi:10.1523/JNEUROSCI.4369-03.2004. PMID 15056696.
- Li G, Wang J, Rossiter SJ, Jones G, Zhang S (2007). Ellegren H, ed. "Accelerated FoxP2 evolution in echolocating bats". PLoS ONE 2 (9): e900. doi:10.1371/journal.pone.0000900. PMC 1976393. PMID 17878935.
- Webb DM, Zhang J (2005). "FoxP2 in song-learning birds and vocal-learning mammals". J. Hered. 96 (3): 212–6. doi:10.1093/jhered/esi025. PMID 15618302.
- Scharff C, Haesler S (2005). "An evolutionary perspective on FoxP2: strictly for the birds?". Curr. Opin. Neurobiol. 15 (6): 694–703. doi:10.1016/j.conb.2005.10.004. PMID 16266802.
- Krause J, Lalueza-Fox C, Orlando L, Enard W, Green RE, Burbano HA, Hublin JJ, Hänni C, Fortea J, de la Rasilla M, Bertranpetit J, Rosas A, Pääbo S (2007). "The derived FOXP2 variant of modern humans was shared with Neandertals". Curr. Biol. 17 (21): 1908–12. doi:10.1016/j.cub.2007.10.008. PMID 17949978. Lay summary – New York Times (19 October 2007). See also Benítez-Burraco A, Longa VM, Lorenzo G, Uriagereka J (November 2008). "Also sprach Neanderthalis... Or Did She?". Biolinguistics 2 (2): 225–232.
- Toda M, Okubo S, Ikigai H, Suzuki T, Suzuki Y, Hara Y, Shimamura T (1992). "The protective activity of tea catechins against experimental infection by Vibrio cholerae O1". Microbiol. Immunol. 36 (9): 999–1001. doi:10.1111/j.1348-0421.1992.tb02103.x. PMC 1461156.
- Li G, Wang J, Rossiter SJ, Jones G, Zhang S (2007). "Accelerated FoxP2 evolution in echolocating bats". PLoS ONE 2 (9): e900. doi:10.1371/journal.pone.0000900. PMC 1976393. PMID 17878935.
- Li S, Weidenfeld J, Morrisey EE (2004). "Transcriptional and DNA binding activity of the Foxp1/2/4 family is modulated by heterotypic and homotypic protein interactions". Mol. Cell. Biol. 24 (2): 809–22. doi:10.1128/MCB.24.2.809-822.2004. PMC 343786. PMID 14701752.
- Vernes SC, Newbury DF, Abrahams BS, Winchester L, Nicod J, Groszer M, Alarcón M, Oliver PL, Davies KE, Geschwind DH, Monaco AP, Fisher SE (2008). "A functional genetic link between distinct developmental language disorders". N. Engl. J. Med. 359 (22): 2337–45. doi:10.1056/NEJMoa0802828. PMC 2756409. PMID 18987363.
- Sia GM, Clem RL, Huganir RL (2013). "The human language-associated gene SRPX2 regulates synapse formation and vocalization in mice". Science 342 (6161): 987–91. doi:10.1126/science.1245079. PMC 3903157. PMID 24179158.
- Holy TE, Guo Z (2005). "Ultrasonic songs of male mice". PLoS Biol. 3 (12): e386. doi:10.1371/journal.pbio.0030386. PMC 1275525. PMID 16248680.
- Teramitsu I, White SA (2006). "FoxP2 regulation during undirected singing in adult songbirds". J. Neurosci. 26 (28): 7390–4. doi:10.1523/JNEUROSCI.1662-06.2006. PMC 2683919. PMID 16837586.
- Schulz SB, Haesler S, Scharff C, Rochefort C (2010). "Knockdown of FoxP2 alters spine density in Area X of the zebra finch". Genes Brain Behav. 9 (7): 732–40. doi:10.1111/j.1601-183X.2010.00607.x. PMID 20528955.
- Wilbrecht L, Nottebohm F (2003). "Vocal learning in birds and humans". Ment Retard Dev Disabil Res Rev 9 (3): 135–48. doi:10.1002/mrdd.10073. PMID 12953292.
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