2Disruption in metacognitive beliefs, including cognitive trust, positive beliefs about worry, negative beliefs about uncontrollability, and the need to control thoughts, can overshadow a person's attention to physical and mental health. Considering the high number of children with mental disabilities, the presence of these children in the family exerts various effects on different aspects of the lives of families and parents. Therefore, the level of self-care in these parents and factors (positive and negative emotions and metacognitive beliefs) that affect their self-care are paramount. Therefore, the present study aimed to assess the metacognitive beliefs and self-care of parents of children with mental disabilities. A query was conducted on Scopus, Science Direct, Iranmedex, Springer, and ProQuest within the time frame of 2003-2022. After reviewing and summarizing the full text of the articles, 31 papers were selected. The findings pointed out that mental DISABILITY is a condition that is formed by various factors, such as attention disabilities, learning disabilities, and social disabilities, along with related behavioral problems. Parents of children with INTELLECTUAL disabilities need special support, self-care, and guidance. Negative metacognitive beliefs may decrease confidence in one's own abilities, intensify stress, decrease motivation and energy, and destroy family relationships. On the other hand, positive metacognitive beliefs cause positive dealing with challenges, self-control, and self-acceptance, helping parents achieve high self-care in this regard. Parents who believe that healthy eating and taking care of the mother's physical and mental health during pregnancy can accelerate the improvement of their children's health. They pay more attention to this issue and will consider preventive approaches before birth as an essential part of their care. Parents who believe that appropriate educational methods can improve their behavior towards their children and their children's abilities plan their children's education according to these beliefs.

Background: INTELLECTUAL DISABILITY (ID) is a heterogonous disorder with complex etiology. The frequency of autosomal recessive inheritance defects was elevated in a consanguineous family. Methods: In this study, high-throughput DNA sequencing was performed in an Iranian consanguineous family with two affected individuals to find potential causative variants. Whole-exome sequencing was carried out on the proband and Sanger sequencing was implemented for validation of the likely causative variant in the family members. Results: A novel homozygous missense mutation (p. Arg122Trp) was detected in the PTRHD1 gene. Conclusion: PTRHD1 has been recently introduced as a candidate ID and Parkinsonism causing gene. Our findings are in agreement with the clinical spectrum of PTRHD1 mutations; however, our affected individuals suffer from ID manifestations.

Background and Objective: Sleep habits not only are affected by a person’, s health but also affect his/her growth and development. Students with INTELLECTUAL DISABILITY (ID) account for 3% of all students. Since sleep habits are among the basic foundations of learning during childhood, this study aimed to determine the parental view on the sleep habits of students with ID in Hamadan, Iran, during September 23 and December 21, 2019. Materials and Methods: In this descriptive-analytical cross-sectional study, 86 students with ID, aged 7-11 years, were selected using the convenience sampling method in Hamadan, Iran, during September 23 and December 21, 2019. Data were collected using a demographic inventory, as well as the Children's Sleep Habits Questionnaire (CSHQ). The pa-rental questionnaires were completed as self-reports by mothers or fathers of students with ID. Data were analyzed us-ing the independent t-test, analysis of variance (ANOVA), and one-way regression in SPSS software. Results: The mean ±,standard deviation (SD) of sleep habit score of students with ID was 73. 66 ±,6. 79. The cut-off score in the questionnaire was 41. 15% and 85% of the students had moderate and severe sleep disturbance. The highest mean score was for distress in morning awakenings (12. 67 ±,2. 83), indicating the presence of sleep disturbance among students with ID. Variables of age, sex, and weight of the students, educational attainment and job of parents, household income, private bedroom, and sleeping status could predict 61% of the students’,sleep habits. There was a significant relationship between the father’, s job and the sleep habits of the students (P < 0. 05). Conclusion: These findings shed light on sleep disturbances in students with ID. Results suggest that sleep habits in students with ID are associated with their father's job. Sleep health should be considered in planning health promotion strategies of these children.

INTELLECTUAL DISABILITY (ID) is a common and highly heterogeneous neurodevelopmental disorder. The prevalence of ID is around 1%– 3% in the general population. ID is associated with a wide range of additional neurological disabilities and the results of various studies have disclosed the co-morbidity of ID and ataxia. The aim of this review is elucidation of the common molecular and cellular pathways in the etiology of ID and ataxia. Categorization of these genes with various cellular functions indicates several genetic collisions in the co-occurrence of ID and ataxia.