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2.
J Clin Transl Sci ; 7(1): e227, 2023.
Article in English | MEDLINE | ID: mdl-38028344

ABSTRACT

Well-being is a multifaceted construct that is used across disciplines to portray a state of wellness, health, and happiness. While aspects of well-being seem universal, how it is depicted in the literature has substantial variation. The aim of this scoping review was to identify conceptual and operational definitions of well-being within the field of occupational health. Broad search terms were used related to well-being and scale/assessment. Inclusion criteria were (1) peer-reviewed articles, (2) published in English, (3) included a measure of well-being in the methods and results section of the article, and (4) empirical paper. The searches resulted in 4394 articles, 3733 articles were excluded by reading the abstract, 661 articles received a full review, and 273 articles were excluded after a full review, leaving 388 articles that met our inclusion criteria and were used to extract well-being assessment information. Many studies did not define well-being or link their conceptual definition to the operational assessment tool being used. There were 158 assessments of well-being represented across studies. Results highlight the lack of a consistent definitions of well-being and standardized measurements.

3.
Female Pelvic Med Reconstr Surg ; 28(6): e195-e200, 2022 06 01.
Article in English | MEDLINE | ID: mdl-35536671

ABSTRACT

IMPORTANCE: In the United States, pelvic floor disorders affect 25% of women. Despite facing unique occupational risk factors that may increase the risk of pelvic floor disorders, there is little research on the prevalence of these disorders in active-duty service women. OBJECTIVES: This study sought to identify the prevalence of and risk factors for pelvic floor disorders in active-duty service women in the United States from diagnostic codes through service utilization. STUDY DESIGN: Utilizing the Military Health System Data Repository, a cross-sectional study was conducted of all active-duty service women in the United States Army, Air Force, Navy, and Marine Corps during fiscal years 2010 to 2019. RESULTS: This study identified 497,255 active-duty service women of whom 9.93% had pelvic floor disorders. Adjusted regression model analyses indicated increasing parity and body mass index significantly affect the risk of pelvic floor disorders. Active-duty women with 3 or more births were 3 times more likely to have pelvic floor disorders compared with the nulliparous group. Finally, subset analysis indicates the risk of pelvic floor disorders were increased 250% in obese women and decreased 20% for underweight women. The rate of pelvic floor disorders appears to be increasing among active-duty women. CONCLUSIONS: Active-duty service women have significantly lower rates of pelvic floor disorders compared with the general population, possibly due to the protective effects of improved weight management and physical fitness requirements for their job performance. However, pelvic floor disorders may be uptrending and need continued monitoring.


Subject(s)
Military Personnel , Pelvic Floor Disorders , Body Mass Index , Cross-Sectional Studies , Female , Humans , Pelvic Floor Disorders/epidemiology , Pregnancy , Prevalence , United States/epidemiology
4.
Mil Med ; 187(7-8): e814-e820, 2022 07 01.
Article in English | MEDLINE | ID: mdl-34159385

ABSTRACT

INTRODUCTION: Physical and medical readiness have emerged as a top priority in the army over the last decade. With this emphasis on deployment readiness, it is important to understand key risk factors attributed to common medical problems that arise in our soldiers, including low back pain. The purpose of this study is to elucidate demographic and lifestyle risk factors which would result in seeking medical care for musculoskeletal low back pain among active duty army personnel. MATERIALS AND METHODS: A cross-sectional retrospective study investigating all active duty soldiers between October 1, 2016 and September 30, 2018 was performed using the existing Military Health System Data Repository to retrospectively review administrative claims data. Our study queried 39 unique International Classification of Disease codes, 10th Revision codes for low back pain to determine a positive case. We compared those with and without back pain across all variables using a chi-square analysis in SAS. Multivariate logistic analysis was performed to adjust for confounding within any single proposed risk factor and the six other proposed risk factors. RESULTS: Six hundred fifty seven thousand and six thirty soldiers met inclusion criteria; 228,184 of whom had a medical encounter for low back pain (34.7%). All of the proposed risk factors included statistically significant unadjusted and adjusted odds ratios (ORs) with age conferring the greatest risk in soldiers aged 50-59 with an OR of 2.89 (2.73-3.05) compared to those aged 20-29. Obesity-adjusted OR was 1.77 (1.74-1.80) compared to those who were normal weight. Senior Enlisted status-adjusted OR was 1.34 (1.32-1.36). Females were 66% more likely to have low back pain compared to males with an OR of 1.66 (1.63-1.68). CONCLUSION: Disease burden for low back pain tends to be high in the U.S. Army with 34.7% of service members experiencing low back pain. Older age, obesity, and being an enlisted, female service member are risk factors for these musculoskeletal injuries, which is in agreement with previously reported literature on the topic. To mitigate the burden of low back pain, policies and incentives to encourage healthy body mass index and lifestyle are needed. The results of this work inform future studies aimed at further delineating the risk factors found in this study.


Subject(s)
Back Injuries , Low Back Pain , Military Personnel , Musculoskeletal Diseases , Back Injuries/epidemiology , Back Injuries/etiology , Cross-Sectional Studies , Female , Humans , Low Back Pain/epidemiology , Low Back Pain/etiology , Male , Musculoskeletal Diseases/complications , Musculoskeletal Diseases/etiology , Obesity/complications , Prevalence , Retrospective Studies , Risk Factors , United States/epidemiology
5.
Mil Med ; 187(7-8): e856-e861, 2022 07 01.
Article in English | MEDLINE | ID: mdl-34050366

ABSTRACT

INTRODUCTION: The polytrauma clinical triad (PCT), encompassing traumatic brain injury, PTSD, and chronic pain, has been identified as a significant concern in the Military Health System (MHS). Conditions in this triad mutually reinforce one another and can pose a significant challenge to treatment for patients and providers. Polytrauma clinical triad has previously been studied in deployed veterans but remains understudied in the active duty military population. Therefore, this novel study seeks to determine the prevalence of PCT among active duty service members and to identify the subpopulations most at risk for PCT. MATERIALS AND METHODS: This cross-section study used the MHS Data Repository in order to retrospectively review all administrative claim data for active duty service members within the Army, Navy, Air Force, and Marine Corps from fiscal years 2010 to 2015. Specific ICD-9 codes were extracted that correlated with traumatic brain injury, PTSD, and chronic pain to determine the risk of PCT. We used logistic regression to compare individuals presenting with the PCT conditions to those service members without any of the PCT diagnoses codes. RESULTS: The study identified 2,441,698 active duty service members eligible for inclusion. The prevalence of all three conditions of PCT was 5.99 per 1,000 patients. Patients with PCT were most likely to be 20-29 years old (52.15%), male (89.83%), White (59.07%), married (64.18%), Junior Enlisted (55.27%), and serving in the Army (74.71%). CONCLUSION: This study is the first to identify the risk of PCT in the active duty military population. Awareness of the risk and subsequent prompt identification of the triad will enable treatment through an integrated, team approach, which should alleviate potential patient suffering and improve the efficiency of care and readiness of service members.


Subject(s)
Brain Injuries, Traumatic , Chronic Pain , Military Personnel , Multiple Trauma , Adult , Brain Injuries, Traumatic/epidemiology , Humans , Male , Multiple Trauma/epidemiology , Prevalence , Retrospective Studies , United States/epidemiology , Young Adult
6.
Mil Med ; 186(3-4): e373-e378, 2021 02 26.
Article in English | MEDLINE | ID: mdl-33175967

ABSTRACT

INTRODUCTION: The U.S. Preventive Services Task Force recommends regular cervical cancer screening for women aged 21-65 years. Such screening is key to reducing mortality and morbidity. Despite improvement in the screening rate, cervical cancer still disproportionately affects women of minority groups because of access to quality health care. The Military Health System (MHS) mitigates this barrier through universal healthcare coverage for all active duty service members and their families. However, such racial/ethnic disparities, seen in civilian population, have not been studied in the MHS. MATERIALS AND METHODS: This is a retrospective cross-sectional study utilizing fiscal years 2011-2016 claims data obtained from the MHS Data Repository for 112,572 active duty service women aged 21-64 years. Study analyses included descriptive statistics on patient demographics, calculations of the proportion of patients who received cervical cancer screenings as well as the proportion of patients in compliance with USPSTF guidelines, and unadjusted odds ratios for the likelihood of compliance by race and military service. RESULTS: Of the study population, 50.0% of active duty women were screened for cervical cancer. When compared to White women, Black (1.05 OR, 1.03-1.08 CI), Native American/Alaskan Native (1.26 OR, 1.15-1.39 CI), and Other (1.12 OR, 1.06-1.18 CI) women were significantly more likely to receive cervical cancer screenings. The proportions of 3-year compliance were relatively equal within each race category (ranging from 43% to 45%), with no significant findings for the odds of compliance in any race when compared to White active duty women; however, proportions of 3-year compliance by service ranged from 11.7% in the Marines to 84.4% in the Navy, and active duty women in the Navy were six times more likely to be in compliance with guidelines than women in the Army. When looking at 5-year compliance in active duty women aged 30-64 years, women in the Navy were more likely than women in the Army to meet compliance guidelines (1.24 OR, 1.14-1.36 CI), while women in the Air Force were slightly less likely (0.90 OR, 0.82-0.98 CI). CONCLUSIONS: The women in our population demonstrated similar or lower compliance than other studies conducted in the U.S. general population, and racial disparities for cervical cancer screening were partially mitigated in active duty service women. While our research demonstrates that universal insurance can help provide equal access and care, investigation into the factors that encourage greater usage among members of different military branches may help to understand and develop policies to improve health care systems.


Subject(s)
Uterine Cervical Neoplasms , Adult , Black or African American , Aged , Cross-Sectional Studies , Early Detection of Cancer , Female , Healthcare Disparities , Humans , Middle Aged , Military Personnel , Retrospective Studies , United States , Uterine Cervical Neoplasms/diagnosis , Uterine Cervical Neoplasms/prevention & control , Young Adult
7.
Mil Med ; 185(11-12): e2137-e2142, 2020 12 30.
Article in English | MEDLINE | ID: mdl-32851412

ABSTRACT

INTRODUCTION: The role of primary care in the United States is vitally important to improving health outcomes, minimizing waste, and controlling cost. The Military Health System is tasked with both caring for its beneficiaries and ensuring the medical readiness of active duty service members, who often have needs unique to those in the civilian population. Balancing the number of individuals assigned to a primary care clinician with the clinician's capacity to meet their medical needs and anticipated appointment demand is a fundamental cornerstone of effective primary care clinic management in any setting. MATERIALS AND METHODS: Using the Military Health System Data Repository, this cross-sectional study utilized descriptive statistics and Poisson regression to describe crude and adjusted primary care appointment utilization trends among Military Health System beneficiaries during fiscal year 2016. RESULTS: The primary care appointment utilization rate of the study population was 3.3 visits per person-year. The youngest and oldest age groups, women, active duty, and those enrolled to Army clinics had the highest utilization rates within each of the respective covariates. Active duty women had the highest utilization of any group in the data set, with a crude rate of 4.7 visits per person-year. CONCLUSIONS: Primary care utilization trends are different among different demographic subgroups within the Military Health System (MHS). Unmet demand, patient acuity, clinician continuity, robustness of team support, and other important factors that influence appointment utilization were not incorporated in this study. Superficially, these data suggest that the MHS enrollment target of 1,100-1,300 patients per full-time primary care clinician is roughly appropriate, though this should be interpreted with caution given the limitations.


Subject(s)
Military Health Services , Military Personnel , Ambulatory Care Facilities , Cross-Sectional Studies , Female , Humans , Primary Health Care , United States
8.
Congenit Heart Dis ; 10(5): E243-9, 2015.
Article in English | MEDLINE | ID: mdl-26108339

ABSTRACT

BACKGROUND: Adult congenital heart disease (ACHD) patients have high rates of untreated depression and anxiety disorders. We evaluated associations among self-reported depression symptoms and alcohol/smoking tobacco use. METHODS: From 2009 to 2013, 202 ACHD patients (45% male) completed questionnaires on depressive symptoms, anxiety symptoms, and substance use as part of routine clinical care. Data were collected by retrospective chart review. RESULTS: Mean age was 31 ± 10 years, 21% reported often feeling depressed and 33% reported feeling nervous or anxious. Sixty-one percent of patients reported some alcohol intake; 25% reported current or previous smoking tobacco use. Patients with depressive symptoms were 3× as likely to report drinking alcohol (OR 2.89; 95% CI 1.29-6.5) and 5× more likely to report smoking tobacco use (OR 5.17; 95% CI 1.49-17.87). Fourteen percent of patients were prescribed antidepressant/antianxiety medications; 43% of patients on medication reported depressive symptoms. In patients reporting symptoms, those who consumed alcohol were less likely to be on antidepressant/antianxiety medications (21%) than those who did not consume alcohol (56%). CONCLUSION: Self-reported depressive symptoms are associated with increased alcohol and smoking tobacco use by ACHD patients. Alcohol use may be a means of self-medicating for untreated depression, but further investigation is needed. Risk factors, including depressive symptoms and substance use, should be routinely assessed and addressed in ACHD patients.


Subject(s)
Alcohol Drinking/psychology , Depression/psychology , Heart Defects, Congenital/psychology , Smoking/psychology , Adult , Age Factors , Chi-Square Distribution , Cross-Sectional Studies , Depression/diagnosis , District of Columbia , Female , Heart Defects, Congenital/complications , Heart Defects, Congenital/diagnosis , Humans , Logistic Models , Male , Odds Ratio , Retrospective Studies , Risk Factors , Self Report , Surveys and Questionnaires , Young Adult
9.
Int J Cardiol Heart Vasc ; 9: 28-31, 2015 Dec 07.
Article in English | MEDLINE | ID: mdl-28785702

ABSTRACT

BACKGROUND: Overweight (OW) and obesity (OB) are endemic in the United States and affect adolescents and adults with congenital heart disease (ACHD). Defining the burden of excess weight on the cardiovascular system in ACHD is the goal of this study. Limitation of exercise capacity due to overweight or obesity might be reversible with weight loss and improve quality of life for ACHD adults. METHODS: Exercise tests performed using a Bruce protocol and measurement of maximum oxygen consumption were retrospectively reviewed on 418 CHD patients. OW and OB were defined as the 85-95 or > 95 percentile respectively for age and gender or by adult criteria. Severity of CHD was assigned based on criteria published in standard guidelines. RESULTS: 63 patients had mild, 198 moderate, and 157 severe heart disease. Each ACHD group was 32 to 34% OW or OB. Measured exercise time (ET) of CHD patients with moderate or severe heart disease was less than that of controls in each weight categories. However, OB or OW people have shorter ET than their normal weight peers with CHD. Multiple regression using ET as the dependent variable finds that female sex, relative BMI, and VE/VCO2 at peak exercise are all associated with lesser ET with high significance. Peak heart rate is associated with greater ET, with borderline significance. Severity of heart disease is not independently associated with ET. CONCLUSIONS: OW and OB are strongly associated with reduced ET in persons with congenital heart disease. Losing weight may improve exercise capacity in ACHD.

10.
J Am Coll Cardiol ; 64(1): 54-62, 2014 Jul 08.
Article in English | MEDLINE | ID: mdl-24998129

ABSTRACT

BACKGROUND: Patients with protein-losing enteropathy (PLE) following the Fontan operation have a reported 50% mortality at 5 years after diagnosis. OBJECTIVES: The aim of this study was to review outcomes in patients with PLE following the Fontan operation. METHODS: From 1992 to 2010, 42 patients (55% male) with PLE following the Fontan operation were identified from clinical databases at the Mayo Clinic. Data were collected retrospectively. RESULTS: Mean age at PLE diagnosis was 18.9 ± 11.0 years. Initial Fontan operation was performed at 10.1 ± 10.8 years of age. Mean time from Fontan operation to PLE diagnosis was 8.4 ± 14.2 years. Survival was 88% at 5 years. Decreased survival was seen in patients with high Fontan pressure (mean >15 mm Hg; p = 0.04), decreased ventricular function (ejection fraction <55%; p = 0.03), and New York Heart Association functional class >2 at diagnosis (p = 0.04). Patients who died had higher pulmonary vascular resistance (3.8 ± 1.6 Wood units [WU] vs. 2.1 ± 1.1 WU; p = 0.017), lower cardiac index (1.6 ± 0.4 l/min/m(2) vs. 2.7 ± 0.7 l/min/m(2); p < 0.0001), and lower mixed venous saturation (53% vs. 66%; p = 0.01), compared with survivors. Factors were assessed at the time of PLE diagnosis. Treatments used more frequently in survivors with PLE included spironolactone (21 [68%]), octreotide (7 [21%]), sildenafil (6 [19%]), fenestration creation (15 [48%]), and relief of Fontan obstruction (7 [23%]). CONCLUSIONS: PLE remains difficult to treat; however, in the current era, survival has improved with advances in treatment. Further study is needed to better understand the mechanism of disease and ideal treatment strategy.


Subject(s)
Fontan Procedure/mortality , Fontan Procedure/trends , Protein-Losing Enteropathies/mortality , Protein-Losing Enteropathies/surgery , Adolescent , Adult , Child , Child, Preschool , Cohort Studies , Female , Humans , Infant , Male , Middle Aged , Retrospective Studies , Survival Rate/trends , Treatment Outcome , Young Adult
11.
Cardiol Young ; 24(2): 303-10, 2014 Apr.
Article in English | MEDLINE | ID: mdl-23570688

ABSTRACT

BACKGROUND: Aortic root dilation has been observed in some patients with tetralogy of Fallot. This study examines whether 22q11.2 deletion is a risk factor for aortic root dilation in tetralogy of Fallot. METHODS: Patients with tetralogy of Fallot, in the age group of 6-18 years, with defined deletion status and echocardiograms (2003-2009) were identified from research databases. The diameter at the aortic annulus, sinus, and sinotubular junction was measured and analysed as Z-scores. Variables were examined in univariate and multivariate regression analysis. RESULTS: Of 171 patients, 66% were male, 16% had 22q11.2 deletion, 40% had an aortic arch anomaly, and 11% had both a 22q11.2 deletion and aortic arch anomaly. Echocardiograms were performed at a mean age of 12 + 3 years. More patients with 22q11.2 deletion had Z-scores >3 at the sinus diameter (45% versus 35%, p = 0.02). In the multivariate analysis, the combination of 22q11.2 deletion and aortic arch anomalies was associated with both aortic annular dilation (p = 0.006) and aortic sinus dilation (p = 0.05). In the subset with pulmonary valve atresia, similar findings were observed at the aortic annulus (Z-score of 4.6 versus 2.2, p = 0.05) and the sinuses (Z-score of 4.4 versus 2.7, p = 0.06). Male sex (p < 0.03) and pulmonary atresia (p < 0.006) were additional risk factors for dilation at the annulus and sinuses. CONCLUSIONS: Children with tetralogy of Fallot with 22q11.2 deletion and aortic arch anomalies have increased aortic annular and aortic sinus dilation. Further longitudinal study is needed to assess whether both features are associated with progressive aortic root dilation.


Subject(s)
Aorta, Thoracic/abnormalities , Aorta/diagnostic imaging , Aortic Diseases/diagnostic imaging , DiGeorge Syndrome/diagnostic imaging , Tetralogy of Fallot/diagnostic imaging , Adolescent , Aortic Diseases/complications , Child , Cohort Studies , DiGeorge Syndrome/complications , Dilatation, Pathologic/complications , Dilatation, Pathologic/diagnostic imaging , Echocardiography , Female , Humans , Male , Multivariate Analysis , Pulmonary Atresia/complications , Pulmonary Atresia/diagnostic imaging , Retrospective Studies , Sex Factors , Tetralogy of Fallot/complications
12.
J Health Commun ; 17(5): 498-514, 2012.
Article in English | MEDLINE | ID: mdl-22339275

ABSTRACT

Parent-child communication about sex is an important reproductive health outcome. Consistent, positive perceptions of communication by parents and children can promote behavioral outcomes such as delaying sexual debut and increasing contraceptive use. The authors investigated whether exposure to messages from the Parents Speak Up National Campaign (PSUNC), a social marketing campaign to promote increased parent-child sexual communication, led to increased children's self-reports of communication. Also, the authors examined whether PSUNC message exposure increased agreement about communication between parents and their children. In a randomized experimental design, the authors surveyed children of parents exposed and not exposed to PSUNC messages. Parents and children completed online instruments asking matched questions about sexual attitudes, beliefs, and communication. The authors matched 394 parents and children for analysis. They used ordinal logistic regression modeling and kappa statistics. Children of parents exposed to PSUNC messages were more likely to (a) report sexual communication than were those not exposed and (b) agree with their parents about extent and content. Parent-child pairs of the same gender, younger pairs, and non-White pairs were more likely to agree. Overall, PSUNC message exposure appears to have promoted more extensive sexual communication. Future research should examine behavioral mechanisms and message receptivity among subgroups of parents and children.


Subject(s)
Communication , Health Promotion/methods , Parent-Child Relations , Sex Education/methods , Social Marketing , Adolescent , Adult , Child , Female , Follow-Up Studies , Health Knowledge, Attitudes, Practice , Humans , Internet , Male , Middle Aged , United States
13.
J Health Commun ; 17(4): 413-31, 2012.
Article in English | MEDLINE | ID: mdl-22206348

ABSTRACT

Public awareness campaigns have been included in universal, communitywide, and programmatic approaches aimed at preventing child abuse and neglect. More evaluation of campaign effects is needed to identify their place on the continuum of evidence-based programs. This article reports on an efficacy study of the Florida Winds of Change campaign using a randomized experimental design. Investigators conducted an online survey of a web-based panel of Florida residents with children 18 years of age or younger living in the home. Six outcomes were measured at baseline and a 30-day follow-up. Three outcomes referred to knowledge of child development, child disciplinary techniques, and community resources for parents. Prevention attitudes or beliefs, motivation, and action were also assessed. Respondents were exposed to three public service announcements and a selection of parent resource material. Logistic regression models revealed that exposure to campaign messages was associated with significant increases in all but one of the campaign outcomes.


Subject(s)
Child Abuse/prevention & control , Health Knowledge, Attitudes, Practice , Parenting , Primary Prevention/methods , Social Marketing , Adult , Aged , Child , Child, Preschool , Female , Humans , Infant , Logistic Models , Male , Middle Aged , Parents , Program Evaluation , Young Adult
14.
Reprod Health ; 8: 15, 2011 May 20.
Article in English | MEDLINE | ID: mdl-21599875

ABSTRACT

Parent-child communication about sex is an important proximal reproductive health outcome. But while campaigns to promote it such as the Parents Speak Up National Campaign (PSUNC) have been effective, little is known about how messages influence parental cognitions and behavior. This study examines which message features explain responses to sexual communication messages. We content analyzed 4 PSUNC ads to identify specific, measurable message and advertising execution features. We then develop quantitative measures of those features, including message strategies, marketing strategies, and voice and other stylistic features, and merged the resulting data into a dataset drawn from a national media tracking survey of the campaign. Finally, we conducted multivariable logistic regression models to identify relationships between message content and ad reactions/receptivity, and between ad reactions/receptivity and parents' cognitions related to sexual communication included in the campaign's conceptual model. We found that overall parents were highly receptive to the PSUNC ads. We did not find significant associations between message content and ad reactions/receptivity. However, we found that reactions/receptivity to specific PSUNC ads were associated with increased norms, self-efficacy, short- and long-term expectations about parent-child sexual communication, as theorized in the conceptual model. This study extends previous research and methods to analyze message content and reactions/receptivity. The results confirm and extend previous PSUNC campaign evaluation and provide further evidence for the conceptual model. Future research should examine additional message content features and the effects of reactions/receptivity.


Subject(s)
Communication , Health Promotion/methods , Parent-Child Relations , Sex Education/methods , Adolescent , Advertising , Child , Female , Health Knowledge, Attitudes, Practice , Humans , Male , Program Evaluation , Sexual Behavior , Social Marketing , United States
15.
Plant J ; 67(3): 485-98, 2011 Aug.
Article in English | MEDLINE | ID: mdl-21501262

ABSTRACT

In plants, γ-aminobutyric acid (GABA) accumulates in the cytosol in response to a variety of stresses. GABA is transported into mitochondria, where it is catabolized into TCA cycle or other intermediates. Although there is circumstantial evidence for mitochondrial GABA transporters in eukaryotes, none have yet been identified. Described here is an Arabidopsis protein similar in sequence and topology to unicellular GABA transporters. The expression of this protein complements a GABA-transport-deficient yeast mutant. Thus the protein was termed AtGABP to indicate GABA-permease activity. In vivo localization of GABP fused to GFP and immunobloting of subcellular fractions demonstrate its mitochondrial localization. Direct [(3) H]GABA uptake measurements into isolated mitochondria revealed impaired uptake into mitochondria of a gabp mutant compared with wild-type (WT) mitochondria, implicating AtGABP as a major mitochondrial GABA carrier. Measurements of CO(2) release, derived from radiolabeled substrates in whole seedlings and in isolated mitochondria, demonstrate impaired GABA-derived input into the TCA cycle, and a compensatory increase in TCA cycle activity in gabp mutants. Finally, growth abnormalities of gabp mutants under limited carbon availability on artificial media, and in soil under low light intensity, combined with their metabolite profiles, suggest an important role for AtGABP in primary carbon metabolism and plant growth. Thus, AtGABP-mediated transport of GABA from the cytosol into mitochondria is important to ensure proper GABA-mediated respiration and carbon metabolism. This function is particularly essential for plant growth under conditions of limited carbon.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/enzymology , Citric Acid Cycle , GABA Plasma Membrane Transport Proteins/metabolism , Mitochondria/enzymology , gamma-Aminobutyric Acid/metabolism , Amino Acid Sequence , Analysis of Variance , Arabidopsis/genetics , Arabidopsis/growth & development , Arabidopsis Proteins/genetics , Blotting, Southern , Carbon/metabolism , Carbon Dioxide/metabolism , Cytosol/metabolism , GABA Plasma Membrane Transport Proteins/genetics , Genetic Complementation Test , Genetic Vectors , Genotype , Green Fluorescent Proteins/metabolism , Immunoblotting/methods , Light , Microscopy, Confocal , Mutagenesis, Insertional , Open Reading Frames , Plant Leaves/growth & development , Plant Leaves/metabolism , Plant Roots/growth & development , Plant Roots/metabolism , Proline/metabolism , Protoplasts/metabolism , Recombinant Fusion Proteins , Saccharomyces cerevisiae/enzymology , Saccharomyces cerevisiae/genetics , Seedlings/growth & development , Seedlings/metabolism , Nicotiana/genetics , Nicotiana/metabolism
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