Titre : Dérive génétique

Dérive génétique : Questions médicales fréquentes

Termes MeSH sélectionnés :

Cognitive Dysfunction
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Arlequin aident à analyser la dérive génétique." } }, { "@type": "Question", "name": "La dérive génétique affecte-t-elle tous les gènes ?", "position": 5, "acceptedAnswer": { "@type": "Answer", "text": "Non, elle affecte principalement les gènes dans des populations isolées." } }, { "@type": "Question", "name": "Quels symptômes sont liés à la dérive génétique ?", "position": 6, "acceptedAnswer": { "@type": "Answer", "text": "La dérive génétique n'a pas de symptômes directs, mais peut affecter la santé des populations." } }, { "@type": "Question", "name": "La dérive génétique cause-t-elle des maladies ?", "position": 7, "acceptedAnswer": { "@type": "Answer", "text": "Indirectement, elle peut augmenter la fréquence de maladies génétiques dans une population." } }, { "@type": "Question", "name": "Y a-t-il des signes de dérive génétique ?", "position": 8, "acceptedAnswer": { "@type": "Answer", "text": "Les signes sont des changements dans la fréquence des traits génétiques au fil du temps." } }, { "@type": "Question", "name": "La dérive génétique affecte-t-elle la fertilité ?", "position": 9, "acceptedAnswer": { "@type": "Answer", "text": "Elle peut influencer la fertilité en modifiant la diversité génétique, mais pas directement." } }, { "@type": "Question", "name": "Les populations isolées montrent-elles des symptômes ?", "position": 10, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elles peuvent présenter des traits spécifiques dus à la dérive génétique." } }, { "@type": "Question", "name": "Comment prévenir la dérive génétique ?", "position": 11, "acceptedAnswer": { "@type": "Answer", "text": "Favoriser la diversité génétique par des échanges entre populations peut aider." } }, { "@type": "Question", "name": "Les réserves naturelles aident-elles ?", "position": 12, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elles préservent la diversité génétique et limitent la dérive dans les populations." } }, { "@type": "Question", "name": "L'élevage sélectif est-il efficace ?", "position": 13, "acceptedAnswer": { "@type": "Answer", "text": "L'élevage sélectif peut réduire les effets de la dérive en maintenant la diversité." } }, { "@type": "Question", "name": "Les programmes de conservation sont-ils utiles ?", "position": 14, "acceptedAnswer": { "@type": "Answer", "text": "Oui, ils aident à maintenir la diversité génétique et à prévenir la dérive." } }, { "@type": "Question", "name": "La migration des espèces aide-t-elle ?", "position": 15, "acceptedAnswer": { "@type": "Answer", "text": "Oui, la migration peut introduire de nouveaux gènes et réduire la dérive." } }, { "@type": "Question", "name": "Y a-t-il des traitements pour la dérive génétique ?", "position": 16, "acceptedAnswer": { "@type": "Answer", "text": "Il n'existe pas de traitements, car c'est un processus évolutif naturel." } }, { "@type": "Question", "name": "Comment gérer les effets de la dérive génétique ?", "position": 17, "acceptedAnswer": { "@type": "Answer", "text": "La gestion passe par la conservation de la diversité génétique dans les populations." } }, { "@type": "Question", "name": "Peut-on prévenir la dérive génétique ?", "position": 18, "acceptedAnswer": { "@type": "Answer", "text": "On peut réduire ses effets par des programmes de reproduction contrôlée." } }, { "@type": "Question", "name": "Les thérapies géniques aident-elles ?", "position": 19, "acceptedAnswer": { "@type": "Answer", "text": "Les thérapies géniques ne ciblent pas la dérive génétique, mais des maladies spécifiques." } }, { "@type": "Question", "name": "La sélection naturelle peut-elle contrer la dérive ?", "position": 20, "acceptedAnswer": { "@type": "Answer", "text": "Oui, la sélection naturelle peut influencer les fréquences alléliques et contrer la dérive." } }, { "@type": "Question", "name": "Quelles complications peuvent survenir ?", "position": 21, "acceptedAnswer": { "@type": "Answer", "text": "La dérive peut entraîner une perte de diversité génétique et des maladies héréditaires." } }, { "@type": "Question", "name": "La dérive génétique augmente-t-elle le risque d'extinction ?", "position": 22, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elle peut accroître le risque d'extinction des populations en réduisant la diversité." } }, { "@type": "Question", "name": "Les populations en danger sont-elles plus affectées ?", "position": 23, "acceptedAnswer": { "@type": "Answer", "text": "Oui, les populations en danger sont plus vulnérables à la dérive génétique." } }, { "@type": "Question", "name": "La dérive peut-elle affecter l'adaptation ?", "position": 24, "acceptedAnswer": { "@type": "Answer", "text": "Oui, elle peut limiter l'adaptation des populations aux changements environnementaux." } }, { "@type": "Question", "name": "Y a-t-il des effets sur la santé publique ?", "position": 25, "acceptedAnswer": { "@type": "Answer", "text": "Oui, la dérive peut influencer la prévalence de certaines maladies dans les populations." } }, { "@type": "Question", "name": "Quels facteurs augmentent la dérive génétique ?", "position": 26, "acceptedAnswer": { "@type": "Answer", "text": "Les petites tailles de population et l'isolement géographique augmentent le risque." } }, { "@type": "Question", "name": "Les événements fondateurs influencent-ils ?", "position": 27, "acceptedAnswer": { "@type": "Answer", "text": "Oui, les événements fondateurs peuvent réduire la diversité génétique et favoriser la dérive." } }, { "@type": "Question", "name": "Le changement climatique est-il un facteur ?", "position": 28, "acceptedAnswer": { "@type": "Answer", "text": "Oui, il peut isoler des populations et augmenter la dérive génétique." } }, { "@type": "Question", "name": "Les maladies peuvent-elles influencer la dérive ?", "position": 29, "acceptedAnswer": { "@type": "Answer", "text": "Oui, les épidémies peuvent réduire la taille de la population et favoriser la dérive." } }, { "@type": "Question", "name": "Les pratiques agricoles affectent-elles la dérive ?", "position": 30, "acceptedAnswer": { "@type": "Answer", "text": "Oui, l'agriculture intensive peut réduire la diversité génétique et favoriser la dérive." } } ] } ] }

Sources (10000 au total)

Predictors of cognitive dysfunction in hereditary transthyretin amyloidosis with liver transplant.

Cognitive dysfunction is part of the broad spectrum of clinical manifestations in older untreated hereditary transthyretin amyloidosis patients with peripheral polyneuropathy.... The objective of this study is to systematically explore cognitive dysfunction in ATTRV30M amyloidosis patients whose disease course was modified by liver transplant (LT).... A series of 269 carriers of TTRVal30Met mutation treated with LT underwent a neuropsychological assessment. Clinical charts were reviewed to identify focal neurological episodes (FNEs), cognitive comp... Cognitive dysfunction was identified in 35 patients (13%)-14 (5%) had mild and 21 (8%) had moderate dysfunction. In comparison to normal cognition, both mild and moderate cognitive dysfunction patient... Consistent with the natural history of the disease, older age and higher severity of the disease are significantly associated and potentially predictors of cognitive dysfunction in ATTRV30M patients t...

Risk factors for cognitive dysfunction amongst patients with cardiovascular diseases.

The impact of cardiovascular diseases on cognition raises important research questions. The study aimed to investigate the relationship between demographic data, cardiovascular diseases, kidney diseas... A cross-sectional study of patients with cardiovascular diseases was performed. The Montreal Cognitive Assessment (MoCA) was applied for cognitive evaluation. Based on MoCA three groups were defined: ... Of 628 patients, 55.2% had mild CD, and the mean age was 67.95 (SD 9.53) years. Cα and Mω were 0.7, indicating good internal consistency. We found a moderate positive correlation between depression an... Mild CD was the most common in patients with cardiovascular diseases. Older age, lower education, being a non-smoker, and renal dysfunction were risk factors for both mild and advanced CD. Female gend...

Predictors of cognitive dysfunction one-year post COVID-19.

(a) To characterize the frequency of objective cognitive deficits and self-perceived cognitive difficulties and (b) to explore demographic and clinical predictors of cognitive dysfunction and cognitiv... One hundred and ten adults diagnosed with COVID-19 between March and November 2020, aged ≤ 74 years underwent a brief neuropsychological evaluation 12 months after infection, which included: Brief Vis... Twenty participants (18.2%) had cognitive dysfunction and 36 (33.3%) had cognitive complaints. Cognitive dysfunction was related to lower education, preinfection history of headache/migraine, and acut... A subset of individuals develops cognitive difficulties in the context of post-COVID syndrome. Results may support the protective effect of education, a known proxy of cognitive reserve. COVID-19 infe...

Cognitive Dysfunction Biomarkers in Patients With Rheumatoid Arthritis: A Systematic Review.

During the last years, a growing number of studies have investigated the link between cognitive dysfunction and rheumatoid arthritis (RA), highlighting the potential pathogenic role of several clinica... We performed a systematic review using PRISMA (Preferred Reported Items for Systematic Reviews and Meta-analysis) protocol. A systematic search was conducted in the PubMed/MEDLINE, EMBASE, LILACS, Sco... Five original studies were included, which provided data from 428 participants. Among plasma proteins, SHH was increased and TTR was reduced in patients with mild cognitive impairment; anti-myelin bas... Despite the relative scarcity of studies on this subject and the heterogeneity of results, we identified possible biomarkers for cognitive deficits in the RA population. Further longitudinal studies a...

Endothelial Dysfunction and Pre-Existing Cognitive Disorders in Stroke Patients.

The origin of pre-existing cognitive impairment in stroke patients remains controversial, with a vascular or a degenerative hypothesis.... To determine whether endothelial dysfunction is associated with pre-existing cognitive problems, lesion load and biological anomalies in stroke patients.... Patients originated from the prospective STROKDEM study. The baseline cognitive state, assessed using the IQ-CODE, and risk factors for stroke were recorded at inclusion. Patients with an IQ-CODE scor... A total of 86 patients were included (52 males; mean age 63.5 ± 11.5 years). Patients with abnormal RHI have hypertension or antihypertensive treatment more often. The baseline IQ-CODE was abnormal in... A vascular mechanism may be responsible for cognitive problems pre-existing stroke. The measurement of endothelial dysfunction after stroke could become an important element of follow-up, providing an...

Cognitive Dysfunction in Heart Failure: Pathophysiology and Implications for Patient Management.

There is increasing recognition of the prevalence and impact of cognitive dysfunction (CD) in heart failure (HF) patients. This contemporary review appraises the evidence for epidemiological associati... CD disproportionately affects heart failure patients, even accounting for known comorbid risk factors, and this may extend to subclinical left ventricular dysfunction. Neuroimaging studies now provide...