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John C DeFries

TitleSr Research Associate
InstitutionUniversity of Colorado Boulder
DepartmentInstitute for Behav Genetics
Phone303/492-2839

    Collapse Research 
    Collapse research activities and funding
    R01HD010333     (WADSWORTH, SALLY J)Apr 1, 1977 - Jul 31, 2012
    NIH/NICHD
    Determinants of Behavioral Development
    Role: Co-Principal Investigator

    P01HD011681     (DEFRIES, JOHN)Jul 1, 1979 - Jun 30, 1992
    NIH/NICHD
    DIFFERENTIAL DIAGNOSIS IN READING DISABILITY
    Role: Principal Investigator

    T32MH016880     (HEWITT, JOHN K.)Aug 1, 1981 - Jun 30, 2020
    NIH/NIMH
    Research Training: Mental Health Behavior Genetics
    Role: Co-Principal Investigator

    P50DA005131     (DEFRIES, JOHN)Sep 30, 1988 - Aug 31, 1997
    NIH/NIDA
    BEHAVIORAL GENETIC STUDIES OF DRUG ABUSE VULNERABILITY
    Role: Principal Investigator

    S15AA008902     (DEFRIES, JOHN)Sep 17, 1990 - Aug 31, 1991
    NIH/NIAAA
    ASIP- UNIVERSITY OF COLORADO AT BOULDER
    Role: Principal Investigator

    P50HD027802     (WILLCUTT, ERIK G)Sep 30, 1990 - Jul 31, 2022
    NIH/NICHD
    Differential Diagnosis in Learning Disabilities
    Role: Co-Principal Investigator

    S15GM047062     (DEFRIES, JOHN)Jun 1, 1991 - May 31, 1992
    NIH/NIGMS
    SMALL INSTRUMENTATION GRANT
    Role: Principal Investigator

    S15AA009259     (DEFRIES, JOHN)Sep 30, 1991 - Aug 31, 1992
    NIH/NIAAA
    SMALL INSTRUMENTATION GRANT
    Role: Principal Investigator

    R01MH053480     (DEFRIES, JOHN)Jun 1, 1997 - May 31, 2001
    NIH/NIMH
    QTL ANALYSIS OF FEAR-RELATED BEHAVIOR IN RODENTS
    Role: Principal Investigator

    R01HD036773     (STALLINGS, MICHAEL C)Aug 1, 1998 - May 31, 2009
    NIH/NICHD
    Nature &Nurture in Social Demography: An Adoption Study
    Role: Co-Principal Investigator

    Collapse Bibliographic 
    Collapse selected publications
    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Faculty can login to make corrections and additions.
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    1. Ricker AA, Corley R, DeFries JC, Wadsworth SJ, Reynolds CA. Examining the influence of perceived stress on developmental change in memory and perceptual speed for adopted and nonadopted individuals. Dev Psychol. 2018 01; 54(1):138-150. PMID: 28981301.
      View in: PubMed
    2. Adams AK, Smith SD, Truong DT, Willcutt EG, Olson RK, DeFries JC, Pennington BF, Gruen JR. Enrichment of putatively damaging rare variants in the DYX2 locus and the reading-related genes CCDC136 and FLNC. Hum Genet. 2017 11; 136(11-12):1395-1405. PMID: 28866788.
      View in: PubMed
    3. Ayorech Z, Selzam S, Smith-Woolley E, Knopik VS, Neiderhiser JM, DeFries JC, Plomin R. Erratum to: Publication Trends Over 55 Years of Behavioral Genetic Research. Behav Genet. 2017 Jul; 47(4):468. PMID: 28474239.
      View in: PubMed
    4. Selzam S, Dale PS, Wagner RK, DeFries JC, Cederlöf M, O'Reilly PF, Krapohl E, Plomin R. Genome-Wide Polygenic Scores Predict Reading Performance Throughout the School Years. Sci Stud Read. 2017 Jul 04; 21(4):334-349. PMID: 28706435.
      View in: PubMed
    5. Arnett AB, Pennington BF, Peterson RL, Willcutt EG, DeFries JC, Olson RK. Explaining the sex difference in dyslexia. J Child Psychol Psychiatry. 2017 Jun; 58(6):719-727. PMID: 28176347.
      View in: PubMed
    6. Wadsworth SJ, DeFries JC, Willcutt EG, Pennington BF, Olson RK. Genetic Etiologies of Comorbidity and Stability for Reading Difficulties and ADHD: A Replication Study. Twin Res Hum Genet. 2016 12; 19(6):647-651. PMID: 27748217.
      View in: PubMed
    7. Gialluisi A, Visconti A, Willcutt EG, Smith SD, Pennington BF, Falchi M, DeFries JC, Olson RK, Francks C, Fisher SE. Investigating the effects of copy number variants on reading and language performance. J Neurodev Disord. 2016; 8:17. PMID: 27186239; PMCID: PMC4868026.
    8. Huibregtse BM, Corley RP, Wadsworth SJ, Vandever JM, DeFries JC, Stallings MC. A Longitudinal Adoption Study of Substance Use Behavior in Adolescence. Twin Res Hum Genet. 2016 08; 19(4):330-40. PMID: 27161024; PMCID: PMC4956534 [Available on 08/01/17].
    9. Christopher ME, Keenan JM, Hulslander J, DeFries JC, Miyake A, Wadsworth SJ, Willcutt E, Pennington B, Olson RK. The genetic and environmental etiologies of the relations between cognitive skills and components of reading ability. J Exp Psychol Gen. 2016 Apr; 145(4):451-66. PMID: 26974208; PMCID: PMC4792094 [Available on 04/01/17].
    10. Ayorech Z, Selzam S, Smith-Woolley E, Knopik VS, Neiderhiser JM, DeFries JC, Plomin R. Publication Trends Over 55 Years of Behavioral Genetic Research. Behav Genet. 2016 09; 46(5):603-607. PMID: 26992731.
      View in: PubMed
    11. Plomin R, DeFries JC, Knopik VS, Neiderhiser JM. Top 10 Replicated Findings From Behavioral Genetics. Perspect Psychol Sci. 2016 Jan; 11(1):3-23. PMID: 26817721; PMCID: PMC4739500 [Available on 01/01/17].
    12. Wadsworth SJ, DeFries JC, Willcutt EG, Pennington BF, Olson RK. The Colorado Longitudinal Twin Study of Reading Difficulties and ADHD: Etiologies of Comorbidity and Stability. Twin Res Hum Genet. 2015 Dec; 18(6):755-61. PMID: 26537134; PMCID: PMC4684790 [Available on 12/01/16].
    13. Arnett AB, Pennington BF, Willcutt EG, DeFries JC, Olson RK. Sex differences in ADHD symptom severity. J Child Psychol Psychiatry. 2015 Jun; 56(6):632-9. PMID: 25283790; PMCID: PMC4385512.
    14. Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, DeFries JC, Wadsworth SJ, Willcutt E, Olson RK. Genetic and environmental etiologies of the longitudinal relations between prereading skills and reading. Child Dev. 2015 Mar-Apr; 86(2):342-61. PMID: 25263167; PMCID: PMC4375099.
    15. Eicher JD, Powers NR, Miller LL, Mueller KL, Mascheretti S, Marino C, Willcutt EG, DeFries JC, Olson RK, Smith SD, Pennington BF, Tomblin JB, Ring SM, Gruen JR. Characterization of the DYX2 locus on chromosome 6p22 with reading disability, language impairment, and IQ. Hum Genet. 2014 Jul; 133(7):869-81. PMID: 24509779.
      View in: PubMed
    16. Willcutt EG, Chhabildas N, Kinnear M, DeFries JC, Olson RK, Leopold DR, Keenan JM, Pennington BF. The internal and external validity of sluggish cognitive tempo and its relation with DSM-IV ADHD. J Abnorm Child Psychol. 2014 Jan; 42(1):21-35. PMID: 24122408; PMCID: PMC3947432.
    17. Power RA, Nagoshi C, DeFries JC, Plomin R. Genome-wide estimates of inbreeding in unrelated individuals and their association with cognitive ability. Eur J Hum Genet. 2014 Mar; 22(3):386-90. PMID: 23860046.
      View in: PubMed
    18. Brant AM, Munakata Y, Boomsma DI, Defries JC, Haworth CM, Keller MC, Martin NG, McGue M, Petrill SA, Plomin R, Wadsworth SJ, Wright MJ, Hewitt JK. The nature and nurture of high IQ: an extended sensitive period for intellectual development. Psychol Sci. 2013 Aug; 24(8):1487-95. PMID: 23818653; PMCID: PMC4511162.
    19. Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, Defries JC, Wadsworth SJ, Willcutt E, Olson RK. The genetic and environmental etiologies of individual differences in early reading growth in Australia, the United States, and Scandinavia. J Exp Child Psychol. 2013 Jul; 115(3):453-67. PMID: 23665180; PMCID: PMC3661747.
    20. Trzaskowski M, Davis OS, DeFries JC, Yang J, Visscher PM, Plomin R. DNA evidence for strong genome-wide pleiotropy of cognitive and learning abilities. Behav Genet. 2013 Jul; 43(4):267-73. PMID: 23609157; PMCID: PMC3690183.
    21. Fujisawa KK, Wadsworth SJ, Kakihana S, Olson RK, Defries JC, Byrne B, Ando J. A multivariate twin study of early literacy in Japanese Kana. Learn Individ Differ. 2013 Apr 01; 24:160-167. PMID: 23997545.
      View in: PubMed
    22. Willcutt EG, Petrill SA, Wu S, Boada R, Defries JC, Olson RK, Pennington BF. Comorbidity between reading disability and math disability: concurrent psychopathology, functional impairment, and neuropsychological functioning. J Learn Disabil. 2013 Nov-Dec; 46(6):500-16. PMID: 23449727; PMCID: PMC3749272.
    23. Christopher ME, Hulslander J, Byrne B, Samuelsson S, Keenan JM, Pennington B, Defries JC, Wadsworth SJ, Willcutt E, Olson RK. Modeling the Etiology of Individual Differences in Early Reading Development: Evidence for Strong Genetic Influences. Sci Stud Read. 2013; 17(5):350-368. PMID: 24489459.
      View in: PubMed
    24. Rhea SA, Bricker JB, Corley RP, Defries JC, Wadsworth SJ. Design, Utility, and History of the Colorado Adoption Project: Examples Involving Adjustment Interactions. Adopt Q. 2013; 16(1):17-39. PMID: 23833552.
      View in: PubMed
    25. Christopher ME, Miyake A, Keenan JM, Pennington B, DeFries JC, Wadsworth SJ, Willcutt E, Olson RK. Predicting word reading and comprehension with executive function and speed measures across development: a latent variable analysis. J Exp Psychol Gen. 2012 Aug; 141(3):470-88. PMID: 22352396; PMCID: PMC3360115.
    26. Astrom RL, Wadsworth SJ, Olson RK, Willcutt EG, Defries JC. Genetic and environmental etiologies of reading difficulties: DeFries-Fulker analysis of reading performance data from twin pairs and their nontwin siblings. Learn Individ Differ. 2012 Jun 01; 22(3):365-369. PMID: 22927712.
      View in: PubMed
    27. Wadsworth SJ, Olson RK, Willcutt EG, DeFries JC. Multiple regression analysis of reading performance data from twin pairs with reading difficulties and nontwin siblings: the augmented model. Twin Res Hum Genet. 2012 Feb; 15(1):116-9. PMID: 22784461; PMCID: PMC3398740.
    28. Willcutt EG, Boada R, Riddle MW, Chhabildas N, DeFries JC, Pennington BF. Colorado Learning Difficulties Questionnaire: validation of a parent-report screening measure. Psychol Assess. 2011 Sep; 23(3):778-91. PMID: 21574721; PMCID: PMC3164385.
    29. Olson RK, Hulslander J, Christopher M, Keenan JM, Wadsworth SJ, Willcutt EG, Pennington BF, DeFries JC. Genetic and environmental influences on writing and their relations to language and reading. Ann Dyslexia. 2013 Apr; 63(1):25-43. PMID: 21842316; PMCID: PMC3218215.
    30. Astrom RL, Wadsworth SJ, Olson RK, Willcutt EG, DeFries JC. DeFries-Fulker analysis of longitudinal reading performance data from twin pairs ascertained for reading difficulties and from their nontwin siblings. Behav Genet. 2011 Sep; 41(5):660-7. PMID: 21259040; PMCID: PMC3085049.
    31. Bidwell LC, Willcutt EG, McQueen MB, DeFries JC, Olson RK, Smith SD, Pennington BF. A family based association study of DRD4, DAT1, and 5HTT and continuous traits of attention-deficit hyperactivity disorder. Behav Genet. 2011 Jan; 41(1):165-74. PMID: 21207241; PMCID: PMC3674022.
    32. Nilsson R, Rhee SH, Corley RP, Rhea SA, Wadsworth SJ, Defries JC. Conduct Problems in Adopted and Non-adopted Adolescents and Adoption Satisfaction as a Protective Factor. Adopt Q. 2011; 14(3):181-198. PMID: 22259226.
      View in: PubMed
    33. Olson RK, Keenan JM, Byrne B, Samuelsson S, Coventry WL, Corley R, Wadsworth SJ, Willcutt EG, Defries JC, Pennington BF, Hulslander J. Genetic and Environmental Influences on Vocabulary and Reading Development. Sci Stud Read. 2011; 15(1):26-46. PMID: 21132077.
      View in: PubMed
    34. Betjemann RS, Keenan JM, Olson RK, Defries JC. Choice of Reading Comprehension Test Influences the Outcomes of Genetic Analyses. Sci Stud Read. 2011 Jan 01; 15(4):363-382. PMID: 21804757.
      View in: PubMed
    35. McGrath LM, Pennington BF, Shanahan MA, Santerre-Lemmon LE, Barnard HD, Willcutt EG, Defries JC, Olson RK. A multiple deficit model of reading disability and attention-deficit/hyperactivity disorder: searching for shared cognitive deficits. J Child Psychol Psychiatry. 2011 May; 52(5):547-57. PMID: 21126246; PMCID: PMC3079018.
    36. Scerri TS, Paracchini S, Morris A, MacPhie IL, Talcott J, Stein J, Smith SD, Pennington BF, Olson RK, DeFries JC, Monaco AP, Richardson AJ. Identification of candidate genes for dyslexia susceptibility on chromosome 18. PLoS One. 2010 Oct 28; 5(10):e13712. PMID: 21060895.
      View in: PubMed
    37. Smith SD, Grigorenko E, Willcutt E, Pennington BF, Olson RK, DeFries JC. Etiologies and molecular mechanisms of communication disorders. J Dev Behav Pediatr. 2010 Sep; 31(7):555-63. PMID: 20814255; PMCID: PMC2943674.
    38. Willcutt EG, Pennington BF, Duncan L, Smith SD, Keenan JM, Wadsworth S, Defries JC, Olson RK. Understanding the complex etiologies of developmental disorders: behavioral and molecular genetic approaches. J Dev Behav Pediatr. 2010 Sep; 31(7):533-44. PMID: 20814254; PMCID: PMC2953861.
    39. Willcutt EG, Betjemann RS, McGrath LM, Chhabildas NA, Olson RK, DeFries JC, Pennington BF. Etiology and neuropsychology of comorbidity between RD and ADHD: the case for multiple-deficit models. Cortex. 2010 Nov-Dec; 46(10):1345-61. PMID: 20828676; PMCID: PMC2993430.
    40. Betjemann RS, Johnson EP, Barnard H, Boada R, Filley CM, Filipek PA, Willcutt EG, DeFries JC, Pennington BF. Genetic covariation between brain volumes and IQ, reading performance, and processing speed. Behav Genet. 2010 Mar; 40(2):135-45. PMID: 20072853; PMCID: PMC3608477.
    41. DeFries JC. Haseman and Elston sib-pair linkage analysis: a brief historical note. Behav Genet. 2010 Jan; 40(1):1-2. PMID: 19707863.
      View in: PubMed
    42. Hawke JL, Olson RK, Willcut EG, Wadsworth SJ, DeFries JC. Gender ratios for reading difficulties. Dyslexia. 2009 Aug; 15(3):239-42. PMID: 19367616; PMCID: PMC2739722.
    43. Byrne B, Coventry WL, Olson RK, Samuelsson S, Corley R, Willcutt EG, Wadsworth S, Defries JC. Genetic and Environmental Influences on Aspects of Literacy and Language in Early Childhood: Continuity and Change from Preschool to Grade 2. J Neurolinguistics. 2009 May; 22(3):219-236. PMID: 20161176.
      View in: PubMed
    44. Brant AM, Haberstick BC, Corley RP, Wadsworth SJ, DeFries JC, Hewitt JK. The developmental etiology of high IQ. Behav Genet. 2009 Jul; 39(4):393-405. PMID: 19377873; PMCID: PMC3086674.
    45. Friend A, DeFries JC, Olson RK, Pennington B, Harlaar N, Byrne B, Samuelsson S, Willcutt EG, Wadsworth SJ, Corley R, Keenan JM. Heritability of high reading ability and its interaction with parental education. Behav Genet. 2009 Jul; 39(4):427-36. PMID: 19296213; PMCID: PMC3387983.
    46. Pennington BF, McGrath LM, Rosenberg J, Barnard H, Smith SD, Willcutt EG, Friend A, Defries JC, Olson RK. Gene X environment interactions in reading disability and attention-deficit/hyperactivity disorder. Dev Psychol. 2009 Jan; 45(1):77-89. PMID: 19209992; PMCID: PMC2743891.
    47. Friend A, DeFries JC, Olson RK. Parental education moderates genetic influences on reading disability. Psychol Sci. 2008 Nov; 19(11):1124-30. PMID: 19076484; PMCID: PMC2605635.
    48. Friedman NP, Miyake A, Young SE, Defries JC, Corley RP, Hewitt JK. Individual differences in executive functions are almost entirely genetic in origin. J Exp Psychol Gen. 2008 May; 137(2):201-25. PMID: 18473654; PMCID: PMC2762790.
    49. Hawke JL, Stallings MC, Wadsworth SJ, DeFries JC. DeFries-Fulker and Pearson-Aitken model-fitting analyses of reading performance data from selected and unselected twin pairs. Behav Genet. 2008 Mar; 38(2):101-7. PMID: 18213514.
      View in: PubMed
    50. Samuelsson S, Byrne B, Olson RK, Hulslander J, Wadsworth S, Corley R, Willcutt EG, Defries JC. Response to early literacy instruction in the United States, Australia, and Scandinavia: A behavioral-genetic analysis. Learn Individ Differ. 2008; 18(3):289-295. PMID: 19122888.
      View in: PubMed
    51. Wadsworth SJ, DeFries JC, Olson RK, Willcutt EG. Colorado longitudinal twin study of reading disability. Ann Dyslexia. 2007 Dec; 57(2):139-60. PMID: 18060583.
      View in: PubMed
    52. Willcutt EG, Pennington BF, Olson RK, DeFries JC. Understanding comorbidity: a twin study of reading disability and attention-deficit/hyperactivity disorder. Am J Med Genet B Neuropsychiatr Genet. 2007 Sep 05; 144B(6):709-14. PMID: 17440942.
      View in: PubMed
    53. Rhee SH, Willcutt EG, Hartman CA, Pennington BF, DeFries JC. Test of alternative hypotheses explaining the comorbidity between attention-deficit/hyperactivity disorder and conduct disorder. J Abnorm Child Psychol. 2008 Jan; 36(1):29-40. PMID: 17636436.
      View in: PubMed
    54. Bidwell LC, Willcutt EG, Defries JC, Pennington BF. Testing for neuropsychological endophenotypes in siblings discordant for attention-deficit/hyperactivity disorder. Biol Psychiatry. 2007 Nov 01; 62(9):991-8. PMID: 17585884; PMCID: PMC2687149.
    55. Astrom RL, Wadsworth SJ, DeFries JC. Etiology of the stability of reading difficulties: the longitudinal twin study of reading disabilities. Twin Res Hum Genet. 2007 Jun; 10(3):434-9. PMID: 17564501.
      View in: PubMed
    56. Friend A, DeFries JC, Wadsworth SJ, Olson RK. Genetic and environmental influences on word recognition and spelling deficits as a function of age. Behav Genet. 2007 May; 37(3):477-86. PMID: 17345157.
      View in: PubMed
    57. Shanahan MA, Pennington BF, Yerys BE, Scott A, Boada R, Willcutt EG, Olson RK, DeFries JC. Processing speed deficits in attention deficit/hyperactivity disorder and reading disability. J Abnorm Child Psychol. 2006 Oct; 34(5):585-602. PMID: 16850284.
      View in: PubMed
    58. Hawke JL, Wadsworth SJ, DeFries JC. Genetic influences on reading difficulties in boys and girls: the Colorado twin study. Dyslexia. 2006 Feb; 12(1):21-9. PMID: 16512171.
      View in: PubMed
    59. Friedman NP, Miyake A, Corley RP, Young SE, Defries JC, Hewitt JK. Not all executive functions are related to intelligence. Psychol Sci. 2006 Feb; 17(2):172-9. PMID: 16466426.
      View in: PubMed
    60. Wadsworth SJ, DeFries JC. Genetic etiology of reading difficulties in boys and girls. Twin Res Hum Genet. 2005 Dec; 8(6):594-601. PMID: 16354501.
      View in: PubMed
    61. Meng H, Smith SD, Hager K, Held M, Liu J, Olson RK, Pennington BF, DeFries JC, Gelernter J, O'Reilly-Pol T, Somlo S, Skudlarski P, Shaywitz SE, Shaywitz BA, Marchione K, Wang Y, Paramasivam M, LoTurco JJ, Page GP, Gruen JR. DCDC2 is associated with reading disability and modulates neuronal development in the brain. Proc Natl Acad Sci U S A. 2005 Nov 22; 102(47):17053-8. PMID: 16278297; PMCID: PMC1278934.
    62. Meng H, Hager K, Held M, Page GP, Olson RK, Pennington BF, DeFries JC, Smith SD, Gruen JR. TDT-association analysis of EKN1 and dyslexia in a Colorado twin cohort. Hum Genet. 2005 Oct; 118(1):87-90. PMID: 16133186.
      View in: PubMed
    63. Francks C, Paracchini S, Smith SD, Richardson AJ, Scerri TS, Cardon LR, Marlow AJ, MacPhie IL, Walter J, Pennington BF, Fisher SE, Olson RK, DeFries JC, Stein JF, Monaco AP. A 77-kilobase region of chromosome 6p22.2 is associated with dyslexia in families from the United Kingdom and from the United States. Am J Hum Genet. 2004 Dec; 75(6):1046-58. PMID: 15514892; PMCID: PMC1182140.
    64. Petrill SA, Lipton PA, Hewitt JK, Plomin R, Cherny SS, Corley R, DeFries JC. Genetic and environmental contributions to general cognitive ability through the first 16 years of life. Dev Psychol. 2004 Sep; 40(5):805-12. PMID: 15355167; PMCID: PMC3710702.
    65. Williams RW, Bennett B, Lu L, Gu J, DeFries JC, Carosone-Link PJ, Rikke BA, Belknap JK, Johnson TE. Genetic structure of the LXS panel of recombinant inbred mouse strains: a powerful resource for complex trait analysis. Mamm Genome. 2004 Aug; 15(8):637-47. PMID: 15457343.
      View in: PubMed
    66. Hulslander J, Talcott J, Witton C, DeFries J, Pennington B, Wadsworth S, Willcutt E, Olson R. Sensory processing, reading, IQ, and attention. J Exp Child Psychol. 2004 Jul; 88(3):274-95. PMID: 15203301.
      View in: PubMed
    67. Tiu RD, Wadsworth SJ, Olson RK, DeFries JC. Causal models of reading disability: a twin study. Twin Res. 2004 Jun; 7(3):275-83. PMID: 15193172.
      View in: PubMed
    68. Deffenbacher KE, Kenyon JB, Hoover DM, Olson RK, Pennington BF, DeFries JC, Smith SD. Refinement of the 6p21.3 quantitative trait locus influencing dyslexia: linkage and association analyses. Hum Genet. 2004 Jul; 115(2):128-38. PMID: 15138886.
      View in: PubMed
    69. Henderson ND, Turri MG, DeFries JC, Flint J. QTL analysis of multiple behavioral measures of anxiety in mice. Behav Genet. 2004 May; 34(3):267-93. PMID: 14990867.
      View in: PubMed
    70. Turri MG, DeFries JC, Henderson ND, Flint J. Multivariate analysis of quantitative trait loci influencing variation in anxiety-related behavior in laboratory mice. Mamm Genome. 2004 Feb; 15(2):69-76. PMID: 15058378.
      View in: PubMed
    71. Flint J, DeFries JC, Henderson ND. Little epistasis for anxiety-related measures in the DeFries strains of laboratory mice. Mamm Genome. 2004 Feb; 15(2):77-82. PMID: 15058379.
      View in: PubMed
    72. O'Connor TG, Caspi A, Defries JC, Plomin R. Genotype-environment interaction in children's adjustment to parental separation. J Child Psychol Psychiatry. 2003 Sep; 44(6):849-56. PMID: 12959493.
      View in: PubMed
    73. Fisher SE, DeFries JC. Developmental dyslexia: genetic dissection of a complex cognitive trait. Nat Rev Neurosci. 2002 Oct; 3(10):767-80. PMID: 12360321.
      View in: PubMed
    74. Knopik VS, Smith SD, Cardon L, Pennington B, Gayan J, Olson RK, DeFries JC. Differential genetic etiology of reading component processes as a function of IQ. Behav Genet. 2002 May; 32(3):181-98. PMID: 12141780.
      View in: PubMed
    75. Willcutt EG, Pennington BF, Smith SD, Cardon LR, Gayán J, Knopik VS, Olson RK, DeFries JC. Quantitative trait locus for reading disability on chromosome 6p is pleiotropic for attention-deficit/hyperactivity disorder. Am J Med Genet. 2002 Apr 08; 114(3):260-8. PMID: 11920845.
      View in: PubMed
    76. Young SE, Smolen A, Corley RP, Krauter KS, DeFries JC, Crowley TJ, Hewitt JK. Dopamine transporter polymorphism associated with externalizing behavior problems in children. Am J Med Genet. 2002 Mar 08; 114(2):144-9. PMID: 11857574.
      View in: PubMed
    77. Francks C, Fisher SE, Olson RK, Pennington BF, Smith SD, DeFries JC, Monaco AP. Fine mapping of the chromosome 2p12-16 dyslexia susceptibility locus: quantitative association analysis and positional candidate genes SEMA4F and OTX1. Psychiatr Genet. 2002 Mar; 12(1):35-41. PMID: 11901358.
      View in: PubMed
    78. Fisher SE, Francks C, Marlow AJ, MacPhie IL, Newbury DF, Cardon LR, Ishikawa-Brush Y, Richardson AJ, Talcott JB, Gayán J, Olson RK, Pennington BF, Smith SD, DeFries JC, Stein JF, Monaco AP. Independent genome-wide scans identify a chromosome 18 quantitative-trait locus influencing dyslexia. Nat Genet. 2002 Jan; 30(1):86-91. PMID: 11743577.
      View in: PubMed
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