Kids These Days: Social Media's Influence on Adolescent Behaviors.

We live in an electronic world with near-ubiquitous access to smartphones and social media. One consequence of this new reality is that children and teenagers may be unduly swayed by social media influencers who promote skincare products and practices, colloquially referred to as "skinfluencers," and enjoy unfettered access to emerging trends-not all of which lead to positive results. Herein, we describe two cases of adolescents presenting to a pediatric dermatology department after trying different beauty trends endorsed by social media influencers. The first patient developed allergic contact dermatitis to "snail slime" (96% Snail Secretion Filtrate; COSRX), a popular over-the-counter skincare product that has received notable attention on social media platforms due to its purported skin hydrating effects. The second patient presented urgently due to her mother's concerns of "overnight moles," which, in fact, the patient had acquired after applying makeup using a social media-endorsed "freckle stamp." Clinicians should be aware of these emerging trends to properly educate, manage, and treat patients susceptible to their influence-especially within the particularly impressionable teenage population.

Bilateral accessory axillary breast tissue in a premenarchal female.

A 9-year-old premenarchal female presented to pediatric dermatology with a 6-month history of periodically tender, bilateral and symmetric axillary masses. Magnetic resonance imaging and subsequent surgical excision confirmed the diagnosis of bilateral accessory axillary breast tissue. Accessory axillary breast tissue is a rare condition seen most in pubertal, pregnant and breastfeeding women. However, it can arise in pre-adolescent patients and should be added to the differential diagnosis of an axillary mass.

A reciprocal translocation involving Aspergillus nidulans snxAHrb1/Gbp2 and gyfA uncovers a new regulator of the G2-M transition and reveals a role in transcriptional repression for the setBSet2 histone H3-lysine-36 methyltransferase.

Aspergillus nidulans snxA, an ortholog of Saccharomyces cerevisiae Hrb1/Gbp2 messenger RNA shuttle proteins, is-in contrast to budding yeast-involved in cell cycle regulation, in which snxA1 and snxA2 mutations as well as a snxA deletion specifically suppress the heat sensitivity of mutations in regulators of the CDK1 mitotic induction pathway. snxA mutations are strongly cold sensitive, and at permissive temperature snxA mRNA and protein expression are strongly repressed. Initial attempts to identify the causative snxA mutations revealed no defects in the SNXA protein. Here, we show that snxA1/A2 mutations resulted from an identical chromosome I-II reciprocal translocation with breakpoints in the snxA first intron and the fourth exon of a GYF-domain gene, gyfA. Surprisingly, a gyfA deletion and a reconstructed gyfA translocation allele suppressed the heat sensitivity of CDK1 pathway mutants in a snxA+ background, demonstrating that 2 unrelated genes, snxA and gyfA, act through the CDK1-CyclinB axis to restrain the G2-M transition, and for the first time identifying a role in G2-M regulation for a GYF-domain protein. To better understand snxA1/A2-reduced expression, we generated suppressors of snxA cold sensitivity in 2 genes: (1) loss of the abundant nucleolar protein Nsr1/nucleolin bypassed the requirement for snxA and (2) loss of the Set2 histone H3 lysine36 (H3K36) methyltransferase or a nonmethylatable histone H3K36L mutant rescued hypomorphic snxA mutants by restoring full transcriptional proficiency, indicating that methylation of H3K36 acts normally to repress snxA transcription. These observations are in line with known Set2 functions in preventing excessive and cryptic transcription of active genes.