Based on the provided abstracts, there is insufficient information to write a comprehensive gene function summary for FBL (fibrillarin rRNA 2'-O-methyltransferase). The PubMed abstracts provided do not contain any direct information about FBL or its functions. The abstracts cover unrelated topics including cardiorespiratory fitness 1, autism spectrum disorder 2, epigenetic alterations in cancer 3, coenzyme Q10 applications 4, hypertrophic cardiomyopathy genetics 5, vitamin D and neurocognitive function 6, MALAT1 in tumorigenesis 7, and cancer-related genes in ALS 8. None of these abstracts mention fibrillarin, rRNA 2'-O-methyltransferase activity, ribosome biogenesis, or any of the molecular functions associated with FBL. To provide an accurate, evidence-based summary of FBL gene function, abstracts specifically discussing fibrillarin and its roles in rRNA processing, ribosome biogenesis, and methyltransferase activity would be required.