Lifestyle factors of people with exceptional longevity.

OBJECTIVES: To assess lifestyle factors including physical activity, smoking, alcohol consumption, and dietary habits in men and women with exceptional longevity. DESIGN: Retrospective cohort study. SETTING: A cohort of community-dwelling Ashkenazi Jewish individuals with exceptional longevity defined as survival and living independently at age 95 and older. PARTICIPANTS: Four hundred seventy-seven individuals (mean 97.3 ± 2.8, range 95-109; 74.6% women) and a subset of participants of the National Health and Nutrition Examination Survey (NHANES) I (n = 3,164) representing the same birth cohort as a comparison group. MEASUREMENTS: A trained interviewer administrated study questionnaires to collect information on lifestyle factors and collected data on anthropometry. RESULTS: People with exceptional longevity had similar mean body mass index (men, 25.4 ± 2.8 kg/m² vs 25.6 ± 4.0 kg/m² , P=.63; women, 25.0 ± 3.5 kg/m² vs 24.9 ± 5.4 kg/m² ; P = .90) and a similar proportion of daily alcohol consumption (men, 23.9 vs 22.4, P = .77; women, 12.1 vs 11.3, P = .80), of regular physical activity (men: 43.1 vs 57.2; P = .07; women: 47.0 vs 44.1, P = .76), and of a low-calorie diet (men: 20.8 vs 21.1, P=.32; women: 27.3 vs 27.1, P=.14) as the NHANES I population. CONCLUSION: People with exceptional longevity are not distinct in terms of lifestyle factors from the general population, suggesting that people with exceptional longevity may interact with environmental factors differently than others. This requires further investigation.

Myosin VI is required for structural integrity of the apical surface of sensory hair cells in zebrafish.

Unconventional myosins have been associated with hearing loss in humans, mice, and zebrafish. Mutations in myosin VI cause both recessive and dominant forms of nonsyndromic deafness in humans and deafness in Snell's waltzer mice associated with abnormal fusion of hair cell stereocilia. Although myosin VI has been implicated in diverse cellular processes such as vesicle trafficking and epithelial morphogenesis, the role of this protein in the sensory hair cells remains unclear. To investigate the function of myosin VI in zebrafish, we cloned and examined the expression pattern of myosin VI, which is duplicated in the zebrafish genome. One duplicate, myo6a, is expressed in a ubiquitous pattern during early development and at later stages, and is highly expressed in the brain, gut, and kidney. myo6b, on the other hand, is predominantly expressed in the sensory epithelium of the ear and lateral line at all developmental stages examined. Both molecules have different splice variants expressed in these tissues. Using a candidate gene approach, we show that myo6b is satellite, a gene responsible for auditory/vestibular defects in zebrafish larvae. Examination of hair cells in satellite mutants revealed that stereociliary bundles are irregular and disorganized. At the ultrastructural level, we observed that the apical surface of satellite mutant hair cells abnormally protrudes above the epithelium and the membrane near the base of the stereocilia is raised. At later stages, stereocilia fused together. We conclude that zebrafish myo6b is required for maintaining the integrity of the apical surface of hair cells, suggesting a conserved role for myosin VI in regulation of actin-based interactions with the plasma membrane.

Multiple mutations of MYO1A, a cochlear-expressed gene, in sensorineural hearing loss.

Myosin I isozymes have been implicated in various motile processes, including organelle translocation, ion-channel gating, and cytoskeleton reorganization. Unconventional myosins were among the first family of proteins found to be associated with hearing loss in both humans and mice. Here, we report the identification of a nonsense mutation, of a trinucleotide insertion leading to an addition of an amino acid, and of six missense mutations in MYO1A cDNA sequence in a group of hearing-impaired patients from Italy. MYO1A, which is located within the DFNA48 locus, is the first myosin I family member found to be involved in causing deafness and may be a major contributor to autosomal dominant-hearing loss.

Without discrimination for religion, race, or gender.

The transplantation of organs, which at first sight appears to be just a technical medical procedure, is, first and foremost a sociocultural action that gives expression to existential perceptions. In Israeli society, as in most western societies the donation of the body or parts of it, is interpreted as possible at a societal level, and not as a gift from one individual to another. The medical achievement inherent in organ transplantation brings forward the relationship between the body, death and society. The moment the body ceases to function biologically, its position within the social entity is examined. The donation of organs evinces the acceptance of the idea that the personal body belongs to the society which sanctions the transition of the private body into organs that become national assets. This research is a first attempt to study the motives of people from Muslim society, who donated organs of their dear ones. The ability of these people to enter into a system of exchange flows from a tacit assumption by all of them that the action is approved by their social group. This paper presents the concepts of death and of the body that enable donation in general and the donation of the Muslim population in particular.