instruction:
Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.
question:
The War of the Spanish Succession was a European conflict of the early 18th century, triggered by the death of the childless Charles II of Spain in November 1700. His closest heirs were members of the Austrian Habsburg and French Bourbon families; acquisition of an undivided Spanish Empire or Monarchy by either threatened the European balance of power. Charles left his throne to Louis XIV's grandson Philip who was proclaimed King of Spain on 16 November 1700. Disputes over the separation of the Spanish and French crowns, division of territories and commercial rights led to war in 1701 between the Bourbons of France and Spain and the Grand Alliance, whose candidate was Archduke Charles, younger son of Habsburg Emperor Leopold. By 1710, fighting was deadlocked; Allied victories in Italy and the Low Countries had driven the French back to their borders but they could not achieve a decisive breakthrough while Philip was secure in Spain. When Archduke Charles succeeded his brother Joseph I as Emperor in 1711, Britain effectively withdrew, forcing its Allies to make peace and leading to the 1713 Treaty of Utrecht, followed in 1714 with Rastatt and Baden. Philip was confirmed as King of Spain and renounced the French throne; Spain retained the bulk of its pre-war territories outside Europe with their European territories divided between Austria, Britain and Savoy. Longer term impacts included Britain's emergence as the leading maritime and commercial power, the beginning of the decline of the Dutch Republic, the creation of a centralised Spanish state and the acceleration of the break-up of the Holy Roman Empire.
answer:
Who was Emperor first, Archduke Charles or his brother Joseph I?


question:
The French Revolution broke out in 1789. At the time France was in a crisis. The government was badly run and people's lives were miserable. King Louis XIV tried to control the national parliament and raise more taxes. But his effort failed. He ordered his troops to Versailles. The people thought that Louis intended to put down the Revolution by force. On July 14, 1789, they stormed and took the Bastille, where political prisoners were kept. Ever since that day, July 14 has been the French National Day. Louis tried to flee the country in 1792, to get support from Austria and Prussia. However, he was caught and put in prison. In September 1792, the monarchy was abolished _ . In the same year, Louis was executed. A few months later his wife, Marie also had her head cut off. The Revolution of France had frightened the other kings of Europe. Armies from Austria and Prussia began to march against France. The French raised republican armies to defend the nation. The Revolution went through a period of terror. Thousands of people lost their lives. In the end, power passed to Napoleon Bonaparte.
answer:
What's this passage about?


question:
Christianson syndrome (CS) is caused by mutations in SLC9A6 and is characterized by severe intellectual disability, absent speech, microcephaly, ataxia, seizures, and behavioral abnormalities. The clinical phenotypes of CS and Angelman syndrome (AS) are similar. Differentiation between CS and AS is important in terms of genetic counseling. We report on two children with CS and confirmed mutations in SLC9A6 focusing on neuroimaging findings and review the available literature. Cerebellar atrophy (CA) occurs in approximately 60% of the patients with CS and develops after the age of 12 months. Hyperintense signal of the cerebellar cortex (CbC) is less common, and may be diffuse, patchy, or involve only the inferior part of the cerebellum and is best seen on coronal fluid attenuation inversion recovery images. CA and CbC-hyperintensity are not neuroimaging features of AS. In a child with the phenotype of AS, CA and/or CbC-hyperintensity are rather specific for CS and should prioritize sequencing of SLC9A6.
answer:

Mutation of which gene is implicated in the Christianson syndrome?