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文章數：92 |
 NINI 尼尼台中店價位會不會太高？》2026台中公益路必吃餐廳｜10大美食評比：燒肉、火鍋、早午餐通通有！ |
| 心情隨筆｜心情日記 2026/04/20 14:15:54 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
身為一個熱愛美食、喜歡在城市裡挖掘驚喜的人，臺中公益路一直是我最常出沒的地方之一。這條路可說是「臺中人的美食戰場」，從精緻西餐到創意火鍋，從日式丼飯到義式早午餐，每走幾步，就會有完全不同的特色料理餐廳。 這次我特別花了一整個月，實際造訪了公益路上十間口碑不錯的餐廳。有的是網友熱推的打卡名店，也有隱藏在巷弄裡的小驚喜。我以環境氛圍、口味表現、價格CP值與再訪意願為基準，整理出這篇實測評比。希望能幫正在猶豫去哪裡吃飯的你，找到那一間「吃完會想再來」的餐廳。 評比標準與整理方向
這次我走訪的10家餐廳橫跨不同料理類型，從高質感牛排館到巷弄系早午餐，每一間都有自己獨特的風格。為了讓整體比較更客觀，我依照以下四大面向進行評比，並搭配實際用餐體驗來打分。
整體而言，我希望這份評比不只是「哪家好吃」，而是幫你在不同情境下（約會、家庭聚餐、朋友小聚、商業午餐）都能快速找到合適的選擇。畢竟，美食不只是味覺的滿足，更是一段段與朋友共享的生活記憶。 10間臺中公益路餐廳評比懶人包公益路向來是臺中人聚餐的首選地段，從火鍋、燒肉到中式料理與早午餐，每走幾步就有驚喜。以下是我實際造訪過的10間代表性餐廳清單，橫跨平價、創意、高級各路風格。
一頭牛日式燒肉｜炭香濃郁的和牛饗宴，約會聚餐首選
走在公益路上，很難不被 一頭牛日式燒肉 的木質外觀吸引。低調卻不失質感的門面，搭配昏黃燈光與暖色調的內裝，讓人一進門就感受到濃濃的日式職人氛圍。店內空間不大，但桌距規劃得宜，每桌皆設有獨立排煙設備，烤肉時完全不怕滿身油煙味。 餐點特色
一頭牛的靈魂，絕對是他們招牌的「三國和牛拼盤」。 用餐體驗整體節奏掌握得非常好。店員會在你剛想烤下一片肉時貼心遞上夾子、幫忙換烤網，讓人完全不用分心。整場用餐過程就像一場表演，從視覺、嗅覺到味覺都被滿足。 綜合評分
地址：408臺中市南屯區公益路二段162號電話：04-23206800 小結語一頭牛日式燒肉不僅是「吃肉的地方」，更像是一場五感盛宴。從進門那一刻到最後一道甜點，都能感受到他們對細節的用心。 TANG Zhan 湯棧｜文青系火鍋代表，麻香湯底與視覺美感並重
在公益路這條美食戰線上，TANG Zhan 湯棧 是讓人一眼就會想走進去的那一種。 餐點特色
湯棧最有名的當然是它的「麻香鍋」。 用餐體驗整體氛圍比一般火鍋店更有質感。 綜合評分
地址：408臺中市南屯區公益路二段248號電話：04-22580617 官網：https://www.facebook.com/TangZhan.tw/ 小結語TANG Zhan 湯棧 把傳統火鍋做出新的樣貌保留臺式鍋物的溫度，又結合現代風格與細節服務，讓吃鍋這件事變得更有品味。 如果你想找一間兼具「好吃、好拍、好放鬆」的火鍋店，湯棧會是公益路上最有風格的選擇之一。 NINI 尼尼臺中店｜明亮寬敞的義式早午餐天堂
如果說前兩間是肉食愛好者的天堂，那 NINI 尼尼臺中店 絕對是想放鬆、聊聊天的好地方。餐廳外觀以白色系與大片玻璃窗為主，陽光灑進室內，讓人一踏入就有種度假般的輕盈感。假日早午餐時段特別熱鬧，建議提早訂位。 餐點特色
NINI 的菜單融合義式與臺灣人口味，選擇多樣且份量十足。主打的 松露燉飯 濃郁卻不膩口，米芯保留微Q口感；而 香蒜海鮮義大利麵 則以新鮮白蝦、花枝與淡菜搭配微辣蒜香，口感層次豐富。 用餐體驗店內氣氛輕鬆不拘謹，無論是一個人帶電腦工作、或朋友聚餐，都能找到舒服角落。餐點上桌速度穩定，服務人員態度親切、補水與收盤都非常主動。整體節奏讓人覺得「時間變慢了」，很適合想遠離忙碌日常的人。 綜合評分
地址：40861臺中市南屯區公益路二段18號電話：04-23288498 小結語NINI 尼尼臺中店是一間能讓人放下手機、慢慢吃飯的餐廳。餐點不追求浮誇，而是以「剛剛好」的份量與風味，陪伴每個平凡午後。如果你在找一間能邊吃邊聊天、拍照也漂亮的早午餐店，NINI 會是你在公益路上最不費力的幸福選擇。 加分100%浜中特選昆布鍋物｜平價卻用心的湯頭系火鍋，家庭聚餐好選擇
在公益路這條高質感餐廳林立的戰場上，加分100%浜中特選昆布鍋物 走的是截然不同的路線。它沒有浮誇的裝潢、也沒有高價位的套餐，但靠著實在的湯頭與親切的服務，默默吸引許多回頭客。每到用餐時間，總能看到家庭或情侶三兩成群地圍著鍋邊聊天。 餐點特色
主打 北海道浜中昆布湯底，湯頭清澈卻不單薄，越煮越能喝出海藻與柴魚的自然香氣。 用餐體驗整體氛圍偏家庭取向，桌距寬敞、座位舒適，帶小孩來也不覺擁擠。店員態度親切，補湯、收盤都很勤快，給人一種「被照顧著」的安心感。 綜合評分
地址：403臺中市西區公益路288號電話：0910855180 小結語加分100%浜中特選昆布鍋物是一間「不浮誇、但會讓人想再訪」的火鍋店。它不追求豪華擺盤，而是用最簡單的湯頭與新鮮食材，傳遞出家常卻不平凡的溫度。 印月餐廳｜中式料理的藝術演繹，宴客與家庭聚會首選
說到臺中公益路的中式料理代表，印月餐廳 絕對是榜上有名。這間開業多年的餐廳以「中菜西吃」的概念聞名，把傳統中式料理以現代手法重新詮釋。從建築外觀到餐具擺設，每個細節都散發著低調的典雅氣息。 餐點特色
印月最令人印象深刻的是他們將傳統中菜融入創意手法。 用餐體驗服務方面完全對得起餐廳的高級定位。從入座、點餐到上菜節奏，都拿捏得恰如其分。每道菜都會有服務人員細心介紹食材與吃法，讓人感受到「被款待」的尊榮感。 綜合評分
地址：408臺中市南屯區公益路二段818號電話：0422511155 小結語印月餐廳是一間「不只吃飯，更像品味生活」的地方。 KoDō 和牛燒肉｜極致職人精神，專為儀式感與頂級味覺而生
若要形容 KoDō 和牛燒肉 的用餐體驗，一句話足以總結——「像在欣賞一場關於肉的表演」。 餐點特色
這裡主打 日本A5和牛冷藏肉，以「精切厚燒」的方式呈現。 用餐體驗KoDō 的最大特色是「儀式感」。 綜合評分
地址：403臺中市西區公益路260號電話：0423220312 官網：https://www.facebook.com/kodo2018/ 小結語KoDō 和牛燒肉不是日常餐廳，而是一場體驗。 永心鳳茶｜在茶香裡用餐的優雅時光，臺味早午餐的新詮釋
走進 永心鳳茶公益店，彷彿進入一間有氣質的茶館。 餐點特色
永心鳳茶的餐點結合中式靈魂與西式擺盤，無論是「炸雞腿飯」還是「紅玉紅茶拿鐵」，都能讓人感受到熟悉卻不平凡的味道。 用餐體驗店內服務人員態度溫和，對茶品介紹詳盡。上餐節奏剛好，不急不徐。 綜合評分
地址：40360臺中市西區公益路68號三樓(勤美誠品)電話：0423221118 小結語永心鳳茶讓人重新定義「臺味」。 三希樓｜老饕級江浙功夫菜，穩重又帶人情味的中式饗宴
位於公益路上的 三希樓 是許多臺中老饕的口袋名單。 餐點特色
三希樓的菜色以 江浙與港式料理 為主，兼顧傳統與現代風味。 用餐體驗三希樓的服務給人一種老派但貼心的感覺。 綜合評分
地址：408臺中市南屯區公益路二段95號電話：0423202322 官網：https://www.sanxilou.com.tw/ 小結語三希樓是一間「吃得出功夫」的餐廳。 一笈壽司｜低調奢華的無菜單日料，職人手藝詮釋旬味極致
在熱鬧的公益路上，一笈壽司 低調得幾乎不顯眼。 餐點特色
一笈壽司採 Omakase（無菜單料理） 形式，每一餐都由主廚根據當日食材設計。 用餐體驗整場用餐約90分鐘，節奏緩慢但沉穩。 綜合評分
地址：408臺中市南屯區公益路二段25號電話：0423206368 官網：https://www.facebook.com/YIJI.sushi/ 小結語一笈壽司是一間真正讓人「放慢呼吸」的餐廳。 茶六燒肉堂｜人氣爆棚的和牛燒肉聖地，肉香與幸福感同時滿分
若要票選公益路上「最難訂位」的餐廳，茶六燒肉堂 絕對名列前茅。 餐點特色
茶六主打 和牛燒肉套餐，價格約落在 $700–$1000 間，份量與品質兼具。 用餐體驗茶六的服務效率相當高。店員親切、換網勤快、補水速度快，整場用餐流程流暢無壓力。 綜合評分
地址：403臺中市西區公益路268號電話：0423281167 官網：https://inline.app/booking/-L93VSXuz8o86ahWDRg0:inline-live-karuizawa/-LUYUEIOYwa7GCUpAFWA 小結語茶六燒肉堂用「穩定品質＋輕奢氛圍」抓住了臺中年輕族群的心。 吃完10家公益路餐廳後的心得與結語吃完這十家餐廳後，臺中公益路不只是一條美食街，而是一段生活風景線。 有的餐廳講究細膩與儀式感，像 一頭牛日式燒肉 與 一笈壽司，讓人感受到食材最純粹的美好 有的則以親切與溫度打動人心，像 加分昆布鍋物、永心鳳茶，讓人明白吃飯不只是為了飽足，而是一種被照顧的幸福。 而像茶六燒肉堂、TANG Zhan 湯棧 這類人氣名店，則用穩定的品質與熱絡的氛圍，成為許多臺中人心中「想吃肉就去那裡」的代名詞。 這十家店，構成了公益路最動人的縮影 有華麗的，也有溫柔的；有傳統的，也有創新的。 每一家都在自己的風格裡發光，讓人吃到的不只是料理，而是一種生活的溫度與節奏。 對我而言，這不僅是一場美食旅程，更是一趟關於「臺中味道」的回憶之旅。 FAQ：關於臺中公益路美食常見問題Q1：公益路哪一區的餐廳最集中？ Q2：需要提前訂位嗎？ 最後的話若要用一句話形容這趟美食之旅，我會說： 加分100%浜中特選昆布鍋物值得專程去嗎？ 如果你也和我一樣喜歡用味蕾探索一座城市，那就把這篇公益路美食攻略收藏起來吧。一笈壽司尾牙氣氛熱鬧嗎？ 無論是約會、慶生、家庭聚餐，或只是想犒賞一下辛苦的自己——這條路上永遠會有一間剛剛好的餐廳在等你。印月餐廳春節期間適合來嗎？ 下一餐，不妨從這10家開始。KoDō 和牛燒肉值得排隊嗎？ 打開手機、約上朋友，讓公益路成為你生活裡最容易抵達的小確幸。NINI 尼尼臺中店單點比較好嗎？ 如果你有私心愛店，也歡迎留言分享，TANG Zhan 湯棧大型聚餐空間夠不夠？ 你的推薦，可能讓我下一趟美食旅程變得更精彩。加分100%浜中特選昆布鍋物有雷嗎？ Scientists led by Bonnie Bassler from Princeton have discovered that various viruses can sense chemical signals emitted by bacteria, using this information to decide when to switch from a dormant state to an aggressive one. Not only have they confirmed this mechanism’s widespread use, but they’ve also identified the tools that control it and observed, via sophisticated imaging, the resulting virus-infected cells’ behaviors. Bonnie Bassler and her research team have discovered that a multitude of viruses respond to quorum sensing, as well as other bacterial chemical signals. Viruses, like movie villains, operate in one of two ways: chill or kill. They may choose to bide their time, silently breaching the body’s defense systems, or launch a full-scale assault, exploding out of hiding and firing in all directions. Viral attacks are almost always suicide missions, ripping apart the cell that the virus has been depending on. The attack can only succeed if enough other healthy cells are around to infect. If the barrage of viral particles hits nothing, the virus cannot sustain itself. It doesn’t die, since viruses aren’t technically alive, but it ceases to function. So for a virus, the key challenge is deciding when to flip from chill mode into kill mode. Four years ago, Princeton biologist Bonnie Bassler and her then-graduate student Justin Silpe discovered that one virus has a key advantage: it can eavesdrop on the communication between bacteria. Specifically, it listens for the “We have a quorum!” chemical that bacterial cells release when they have reached a critical number for their own purposes. (The original discovery of this bacterial communication process, called quorum sensing, has led to a string of awards for Bassler and her colleagues.) Now Bassler, Silpe, and their research colleagues have found that dozens of viruses respond to quorum sensing or other chemical signals from bacteria. Their work was recently published in the journal Nature. “The world is loaded with viruses that can surveil appropriate host information,” said Bassler, Princeton’s Squibb Professor in Molecular Biology and the chair of the department of molecular biology. “We don’t know what all the stimuli are, but we showed in this paper that this is a common mechanism.” Not only did they demonstrate the strategy’s abundance, but they also discovered tools that control it and send signals that tell the viruses to flip from chill into kill mode. From left: Justin Silpe, Grace Johnson, Bonnie Bassler, Grace Beggs and their research team discovered that when two viruses have infiltrated the same cell, they use chemical signals to compete for who gets to spread further into their host. Credit: C. Todd Reichart, Office of Information of Technology, Princeton University Phages: The Viral Invaders of Bacteria The kind of viruses that attack bacterial cells, known as bacteriophages — or phages for short — land on the surface of a bacterial cell and deliver their genes into the cell. More than one kind of phage can infect a bacterium at the same time, as long as they’re all in chill mode, which biologists call lysogeny. When it involves multiple phages chilling in a single bacterium, it’s called polylysogeny. In polylysogeny, the phages can coexist, letting the cell copy itself over and over again as healthy cells do, the viral DNA or RNA hidden tucked inside the bacterium’s own, replicating right along with the cells. But the infiltrating phages aren’t exactly peaceful; it’s more like mutually assured destruction. And the tenuous detente lasts only until something triggers one or more of the phages to switch into kill mode. Scientists studying phage warfare have long known that a major disruption to the system — like high-dose UV radiation, carcinogenic chemicals, or even some chemotherapy drugs — can kick all the resident phages into kill mode. At that point, scientists thought, the phages start sprinting for the bacterium’s resources, and whichever phage is the fastest will win, shooting out its own viral particles. Unexpected Results in Phage Warfare But that’s not what Bassler’s team found. Grace Johnson, a postdoctoral research associate in Bassler’s research group, used high-resolution imaging to watch individual bacterial cells that were infected with two phages as she flooded them with one of these universal kill signals. Both phages leaped into action, shredding the host cell. To see the outcome, Johnson “painted” each phage’s genes with special fluorescent tags that light up in different colors depending which phage was replicating. When they lit up, she was shocked to see that there wasn’t a clear winner. It wasn’t even a tie between the two. Instead, she saw that some bacteria glowed with one color, others with the second color, and still others were a blend — simultaneously producing both phages at the same time. “No one ever imagined that there would be three subpopulations,” said Bassler. “That was a really exciting day,” said Johnson. “I could see the different cells undertaking all the possible phage production combinations — inducing one of the phages, inducing another, inducing both. And some of the cells were not inducing either of the phages.” Another challenge was to find a way to trigger only one of the two phages at a time. Controlling Phage Activation Silpe, who had come back to Bassler’s lab as a postdoctoral research associate after performing postdoctoral studies at Harvard, had taken the lead on finding the triggers. While the team still doesn’t know what signals these phages respond to in nature, Silpe has designed a specific artificial chemical trigger for each phage. Grace Beggs, another postdoctoral fellow in the Bassler group, was instrumental in the molecular analyses of the artificial systems. When Silpe exposed the polylysogenic cells to his cue, only the phage that responded to his artificial trigger replicated, and in all of the cells. The other phage remained wholly in chill mode. “I didn’t think it would work,” he said. “I expected that because my strategy did not mimic the authentic process found in nature, both phages would replicate. It was a surprise that we saw only one phage. No one had ever done that before, that I’m aware of.” “I don’t think anybody even thought to ask a question about how phage-phage warfare plays out in a single cell because they didn’t think they could until Grace J. and Justin did their experiment,” Bassler said. “Bacteria are really tiny. It’s hard to image even individual bacteria, and it’s really, really hard to image phage genes inside bacteria. We’re talking smaller than small.” Johnson had been adapting the imaging platform — fluorescence in situ hybridization, usually called FISH — for another quorum-sensing project involving biofilms, but when she heard Silpe share his research at a group meeting, she realized that FISH could reveal what up to that point were intractable secrets about his eavesdropping phages. The majority of the world’s bacteria have more than one phage chilling inside of them, “but nobody’s been able to manipulate and image them the way these two did,” Bassler said. “The cunning strategy where they could induce one phage, the other phage, or both phages on demand — that was Justin’s coup, and then to be able to actually see it happening in a single cell? That’s also never been done. That was Grace J. We can see the phage warfare at the level of the single cell.” Nearly all genes on viral genomes remain mysterious, Bassler added. We simply don’t know what most viral genes do. “Yes, here, we discovered the functions of a few phage genes, and we showed that their jobs are to enable this completely unexpected chill-kill switch and that the switch dictates which phage wins during phage-phage warfare. That discovery suggests there remain potentially even more exciting processes left to find,” she said. “Phages started the molecular biology era 70 years ago, and they’re coming back into vogue both as therapies and also as this incredible repository of molecular tricks that have been deployed through evolutionary time. It’s a treasure trove, and it’s almost completely unexplored.” Reference: “Small protein modules dictate prophage fates during polylysogeny” by Justin E. Silpe, Olivia P. Duddy, Grace E. Johnson, Grace A. Beggs, Fatima A. Hussain, Kevin J. Forsberg and Bonnie L. Bassler, 26 July 2023, Nature. DOI: 10.1038/s41586-023-06376-y The study was funded by Princeton University, Howard Hughes Medical Institute, the National Institutes of Health, the National Science Foundation, the Jane Coffin Childs Memorial Fund for Medical Research, the Office of Extramural Research, and the Damon Runyon Cancer Research Foundation. Researchers from the Telomere-to-Telomere (T2T) consortium have successfully sequenced the complex Y chromosome, adding 30 million new bases to the human genome reference. This accomplishment reveals 41 new protein-coding genes and promises to revolutionize studies on reproduction, evolution, and population changes. The Telomere-to-Telomere consortium has fully sequenced the Y chromosome, uncovering 41 new genes and adding 30 million new bases to the human genome. This breakthrough will impact studies on reproduction, evolution, and human population changes, and correct previous misidentifications of bacterial DNA. Future endeavors aim to integrate this data into the human pangenome for global research collaborations. For decades, the Y chromosome – one of the two human sex chromosomes – has been notoriously challenging for the genomics community to sequence due to the complexity of its structure. Now, this elusive area of the genome has been fully sequenced, a feat that finally completes the set of end-to-end human chromosomes and adds 30 million new bases to the human genome reference, mostly from challenging-to-sequence satellite DNA. These bases reveal 41 additional protein-coding genes, and provide crucial insight for those studying important questions related to reproduction, evolution, and population change. Researchers from the Telomere-to-Telomere (T2T) consortium, which is co-led by the University of California, Santa Cruz Assistant Professor of Biomolecular Engineering Karen Miga, announced this achievement in a new paper to be published today (August 23) in the journal Nature. The complete, annotated Y chromosome reference is available for use on the UCSC Genome Browser and can be accessed via Github. “Just a few years ago, half of the human Y chromosome was missing [from the reference] – the challenging, complex satellite areas,” said Monika Cechova, co-lead author on the paper and postdoctoral scholar in biomolecular engineering at UCSC. “Back then we didn’t even know if it could be sequenced, it was so puzzling. This is really a huge shift in what’s possible.” Until recently, about half of the human Y chromosome was missing from the reference genome. Now, scientists have sequenced this chromosome from end to end. Credit: Darryl Leja, National Human Genome Research Institute (NHGRI) Decoding the Y Chromosome When scientists and clinicians study an individual’s genome, they compare the individuals’ DNA to that of a standard reference to determine where there is variation. Until now, the Y chromosome portion of the human genome has contained large gaps which made it difficult to understand variation and associated disease. The structure of the Y chromosome has been challenging to decode because some of the DNA is organized in palindromes – long sequences that are the same forward and backward – spanning up to more than a million base pairs. Moreover, a very large part of the Y chromosome that was missing from the previous version of the Y reference is satellite DNA – large, highly repetitive regions of non-protein-coding DNA. On the Y chromosome, two satellites are interlinked with each other, further complicating the sequencing process. Karen Miga. Credit: Nick Gonzales/UC Santa Cruz The researchers were able to achieve a gapless read of the Y chromosome due to advances in long-read sequencing technology and new, innovative computational assembly methods that could deal with the repetitive sequences and transform the raw data from sequencing into a usable resource. These new method assemblies allowed the team to tackle some of the particularly challenging aspects of the Y chromosome, such as pinpointing precisely where an inversion occurs in a palindromic sequence — a technique that can be used to find other inversions. The methods established in the paper will allow scientists to complete more end-to-end reads of human Y chromosomes to get a better understanding of how this genetic material affects the diverse human population. “It was the Y chromosome that lacked the most sequences from the previous reference genome,” said Arang Rhie, a staff scientist at the National Human Genome Research Institute and the paper’s lead author. “It was always irritating knowing we were missing half the Y whenever we tried to do any reference-based analysis. I was really excited to curate the first complete Y, to see what we were actually missing, and what we can now do.” The Path to Completion In 2018, Miga and her colleagues released the first complete map of a human centromere on the Y chromosome. This first gap closure was credited to access to ultra-long data, which builds on nanopore sequencing technology that has its origins here at UCSC. It was clear at that point that emerging technology and high-coverage long-read datasets had the potential to complete entire chromosomes end to end, which led to the launch of the T2T Consortium, co-led by Phillippy and Miga. Now, just five years later, the T2T consortium has filled in 30 million additional base pairs, in addition to the first fully sequenced human genome (all the autosomes and the X chromosome) that was released in 2022. Karen Miga in the lab. Credit: Carolyn Lagattuta / UC Santa Cruz Enabling New Research and Discoveries The Y chromosome is most commonly associated with male individuals, but may be found in others, such as intersex people. The sex characteristics regulated by DNA on the Y chromosome are also not equivalent to an individual’s gender identity. While there are relatively few genes on the Y chromosome, the ones that are present are complex and dynamic, and code for important functions such as spermatogenesis, the production of sperm. The complete Y chromosome reference will allow scientists to better study a myriad of features about this part of the human genome in a way that has never before been possible. The complex structure of the Y chromosome has lent itself to rapid evolution within its gene families. In fact, the Y chromosome is the most rapidly changing human chromosome, and even the most rapidly changing chromosome among great apes. This means two healthy people’s Y chromosomes can look very different – for example, one person might have 40 copies of one gene, while another person has 19 copies. This evolution can now be better studied using the new reference and the established methods for sequencing Y chromosomes. This could be the future focus of in vitro fertilization clinics or other research on reproduction and infertility. The end-to-end Y chromosome sequence is a hugely important resource for those studying human population evolution and drift. This is because the Y chromosome is inherited from generation to generation in one group of genetic material, with very little recombination outside of that group, unlike the autosomes and genes on the human X chromosome which often recombine and share genetic material with each other. Having a clearer picture of the Y chromosome makes it easier to track genes across generations of inheritance and learn how the location and content of genes has changed over time. The 30 million new bases added to the Y chromosome reference will also be crucial for studying genome evolution. It will now be possible to study specific and unique Y chromosome sequence patterns, such as the structure of the two satellites and the location and copy numbers of the genes. Even within the Y chromosome, the genes are split into several regions, which are very different from each other in terms of content, structure, and evolutionary history. Understanding rates of change on the Y chromosome and how to interpret this change are intriguing questions that will now be possible to study using the techniques developed in this paper to completely sequence human Y chromosomes. The richer reference that includes the full sequence of the Y chromosome satellite DNA will also allow scientists to better understand the evolutionary relationship of these sequences with satellite DNA found elsewhere on the genome. “It is exciting to be able to finally see these sequences in heterochromatic [densely-packed] regions for the first time. Finally, we can design experiments to test the impact and function of these previously unexplored parts of the Y chromosome,” Miga said. It’s been shown that people with Y chromosomes can lose some or all of that genetic material as they age, but scientists have never fully understood why this happens and the effects it may have. The complete Y chromosome reference may help to illuminate this mystery. It will also be easier to study conditions and disorders that are linked to the Y chromosome, such as the lack of sperm production which leads to infertility. Contamination in Bacterial Genomes An unexpected finding from this paper was that Y chromosome DNA has been repeatedly mistaken to be bacterial DNA in past studies due to the incomplete removal of human contamination in bacterial DNA. This discovery promises to improve the study of bacterial species’ genomes. Human DNA can appear as a contaminant in the genomic samples of bacterial species because the bacterial DNA is often taken from swipes off of human skin. Scientists use the current human genome reference to identify which sequences come from human contamination and remove those, leaving just the bacterial DNA for their study. But, because large parts of the human Y chromosome were missing from the past human reference, scientists were not able to identify them as human and thus mistook them to be part of the DNA of the species they were studying. This paper finds evidence that about 5,000 bacterial genomes in a common database likely contained contamination matching human Y sequences. The groups studying these bacterial species can use the updated Y reference to correctly remove all human contamination from their reference genomes and get a clearer understanding of the bacterial genome. “That was a surprising thing,” Rhie said. “People were guessing at it, but no one could prove that this was happening until now.” Pangenome Y and Future Directions While the complete human Y chromosome will open the door to many new discoveries, the researchers plan to further improve the study of this region by including the Y chromosome in future versions of the human pangenome. The pangenome is a new reference for genomics that combines the genomic information of multiple people from various ancestral backgrounds to ultimately enable more equitable research and clinical discoveries such as helping to diagnose disease, predict medical outcomes, and guide treatments. In collaboration with the Human Pangenome Reference Consortium, the researchers plan to incorporate complete Y chromosome sequences into the individual genomes that make up the pangenome. This will help scientists understand how the Y chromosome varies among people of different ancestral backgrounds and provide a better point of reference for understanding the Y across the diversity of the human population. The researchers hope to be able to collaborate with scientists around the world to enable others to complete Y chromosome sequencing. “We aim to make these data widely accessible,” Miga said. “By creating and sharing these important catalogs of genetic differences on the Y chromosome, we can expand genetic studies of human disease and provide new insights into basic biology.” For more on this breakthrough, see Complete Human Y Chromosome Sequence Assembled for the First Time. Reference: “The complete sequence of a human Y chromosome” by Arang Rhie, Sergey Nurk, Monika Cechova, Savannah J. Hoyt, Dylan J. Taylor, Nicolas Altemose, Paul W. Hook, Sergey Koren, Mikko Rautiainen, Ivan A. Alexandrov, Jamie Allen, Mobin Asri, Andrey V. Bzikadze, Nae-Chyun Chen, Chen-Shan Chin, Mark Diekhans, Paul Flicek, Giulio Formenti, Arkarachai Fungtammasan, Carlos Garcia Giron, Erik Garrison, Ariel Gershman, Jennifer L. Gerton, Patrick G. S. Grady, Andrea Guarracino, Leanne Haggerty, Reza Halabian, Nancy F. Hansen, Robert Harris, Gabrielle A. Hartley, William T. Harvey, Marina Haukness, Jakob Heinz, Thibaut Hourlier, Robert M. Hubley, Sarah E. Hunt, Stephen Hwang, Miten Jain, Rupesh K. Kesharwani, Alexandra P. Lewis, Heng Li, Glennis A. Logsdon, Julian K. Lucas, Wojciech Makalowski, Christopher Markovic, Fergal J. Martin, Ann M. Mc Cartney, Rajiv C. McCoy, Jennifer McDaniel, Brandy M. McNulty, Paul Medvedev, Alla Mikheenko, Katherine M. Munson, Terence D. Murphy, Hugh E. Olsen, Nathan D. Olson, Luis F. Paulin, David Porubsky, Tamara Potapova, Fedor Ryabov, Steven L. Salzberg, Michael E. G. Sauria, Fritz J. Sedlazeck, Kishwar Shafin, Valery A. Shepelev, Alaina Shumate, Jessica M. Storer, Likhitha Surapaneni, Angela M. Taravella Oill, Françoise Thibaud-Nissen, Winston Timp, Marta Tomaszkiewicz, Mitchell R. Vollger, Brian P. Walenz, Allison C. Watwood, Matthias H. Weissensteiner, Aaron M. Wenger, Melissa A. Wilson, Samantha Zarate, Yiming Zhu, Justin M. Zook, Evan E. Eichler, Rachel J. O’Neill, Michael C. Schatz, Karen H. Miga, Kateryna D. Makova and Adam M. Phillippy, 23 August 2023, Nature. DOI: 10.1038/s41586-023-06457-y Image of a human Purkinje cell. Nearly all Purkinje cells in the human cerebellum have multiple primary dendrites sprouting from the cell body and splitting into beautiful, leaf-like patterns. Credit: Silas Busch, University of Chicago Images of thousands of Purkinje cells reveal that almost all human cells have multiple primary dendrites. These structures, when observed in mice, facilitate connections with multiple climbing fibers originating from the brain stem. In 1906, the Spanish researcher Santiago Ramón y Cajal received the Nobel Prize for his trailblazing exploration of the microscopic structures of the brain. His renowned illustrations of Purkinje cells within the cerebellum depict a forest of neuron structures, with multiple large branches sprouting from the cell body and splitting into beautiful, leaf-like patterns. Despite these early portrayals showing multiple dendrites branching out from the cell body, the enduring consensus among neuroscientists is that Purkinje cells possess only a single main dendrite that forms a connection with a lone climbing fiber originating from the brain stem. However, a recent study from the University of Chicago, recently published in the journal Science, reveals that Cajal’s sketches were indeed accurate — practically all Purkinje cells in the human cerebellum have multiple primary dendrites. Further studies in mice showed that about 50% of their Purkinje cells have this more complex structure too, and of these cells, 25% receive input from multiple climbing fibers that connect with different primary dendrite branches. Experiments recording cell activity in live mice also revealed that the primary branches can be activated independently, responding to different stimuli from the environment. “The more you work with a certain prototype of a cell in your mind, the more you accept it,” said Christian Hansel, Ph.D., Professor of Neurobiology at UChicago and senior author of the study, referring to the canonical model that Purkinje cells have one primary dendrite that connects with one climbing fiber. “These drawings by Cajal have been around since the 1900s, so we definitely had enough time to pay attention, but only now with this quantitative analysis do we see that it’s almost universal that human cells have multiple full dendrites each, and we can see that it makes a qualitative difference too.” Rewriting a Textbook Idea The cerebellum (from the Latin, ‘little brain’) sits at the base of the cranium, just above where the spinal cord connects. Ever since French physician Jean Pierre Flourens first described the cerebellum’s function in 1824, scientists believed that its sole job was coordinating movement and muscular activity, but advances in technology have shown that the cerebellum also plays a significant role in processing input about the body’s internal and external environment, including sensations of proprioception and balance. Cerebellar Purkinje cells are like large antennae receiving thousands of inputs conveying a spectrum of contextual information from the rest of the body. These signals are then integrated with a prediction-error signal, indicating a mismatch between the context and the brain’s expectation. This error signal is provided by nerve fibers that climb up from the brain stem and connect with their target Purkinje dendrite structures. Quite appropriately, these nerves are called “climbing fibers.” The standard understanding of these connections has been that each Purkinje cell has one primary dendrite that branches from the cell body and connects with one climbing fiber, forming a single computational unit. Belief in this one-to-one relationship between climbing fibers and Purkinje cells, a central dogma in the field that can be found in every neuroscience textbook, largely comes from studies on rodents, which do primarily have the single dendrite configuration. Mouse Purkinje cells. Although 50% of mouse Purkinje cells have a single primary dendrite, the other half have multiple dendrites much like human cells. Credit: Silas Busch, University of Chicago Many studies of these structures in the past have focused on small numbers of cells though, so for this new research, Silas Busch, a PhD student in Hansel’s lab and first author on the paper, started by looking at thousands of cells from both human and mouse tissue. He used a targeted, antibody-based staining technique, known as immunohistochemistry, to selectively label Purkinje cells in thin slices of cerebellum. He then categorized the structure of all the cells he could observe and found that more than 95% of human Purkinje cells had multiple primary dendrites, while in mice that figure was much closer to half. “You get a sense for how much this was a prevailing idea in the field because anatomically, they are referred to as the ‘primary’ dendrite of a cell,” Busch said. “So, even the description of the structure of these cells is based on that mouse prototype that has one dendrite you can call a primary dendrite.” This remarkable species difference, in one of the most evolutionarily conserved brain areas shared across mammals and even other vertebrates, led Busch and Hansel to ask if there might be a functional consequence to having multiple primary dendrites instead of just one. The climbing fiber, with an auspicious one-to-one relationship and intimate entanglement of the primary dendrite, was their first suspect. Using sections of mouse cerebellum that contained still living cells, Busch injected the cells with dye to see their branches and then stimulated climbing fiber inputs. He observed that 25% of cells with multiple primary dendrites received multiple climbing fibers, rewriting a textbook idea that each and every Purkinje cell gets only one climbing fiber input, while cells with a single primary dendrite did not. Walking Mice and Wiggling Whiskers Encouraged by this finding that a sizable portion – albeit a minority – of Purkinje cells with multiple primary dendrites also received input from multiple climbing fibers, Busch conducted a series of experiments in living mice to see if it led to functional differences in the live mouse. First, he injected a fluorescent calcium indicator dye into the cerebellum and implanted a small glass window so he could later observe the flow of calcium into the Purkinje cell dendrites. By restraining the mouse’s head under a microscope while it ran on a treadmill, he could measure calcium flow that indicated when a climbing fiber is providing a strong input to the cell. In cells with one primary dendrite, high-resolution images showed that the activity signal was uniform across its structure; in cells with multiple primary dendrites, he could detect activity on each side occurring at different times, meaning that one dendrite could be activated by its climbing fiber while the other dendrite in the same cell was not. Next, Busch wanted to see if he could tease out individual climbing fiber activity by using a more precise stimulus: the mouse’s whiskers. For this experiment though, Busch had to sedate the mice (“I don’t know if you’ve ever tried to stimulate individual whiskers in an awake mouse, but it’s really hard,” he said). With the mice asleep, Busch threaded individual whiskers into a small glass tube and wiggled them back and forth. Here, he could also see activity in distinct dendritic branches of the Purkinje cells, suggesting that individual climbing fibers were signaling the input from individual whiskers to individual dendrites. Finally, for a more real-world scenario, Busch also tested awake mice with several stimuli, like flashes of light, sounds, or air puffs on the whisker pad. Again, he saw differences across the Purkinje cells. In some, one branch would differentially favor one stimulus, so it might be particularly responsive to light but not sound. Then the other branch might be preferentially responsive to sound, but not light. “This happened in a minority of cells since there are fewer with multiple branches in mice, and not all of them get multiple climbing fibers, but still, the presence of this effect was very interesting,” Busch said. “It confirmed this idea that the two climbing fiber inputs will have different functional purposes that represent different information.” The Cerebellum’s Connectivity Becomes More Clear This new evidence upends standard thinking about a brain area thought to be fairly solved anatomically and has functional consequences as well. As the climbing fibers provide input from the brain stem, the Purkinje cells aggregate and process that information. Multiple inputs connecting at multiple points on the cells provide more computational power, allowing brain circuits to adapt and respond to changes in the environment or the body that require different movements, and this non-canonical connectivity is closely tied to the structure of Purkinje cell dendrites. There is also evidence that these connections in the cerebellum can be involved in disease. In 2013, for example, Hansel worked on a study with UChicago neurologist Christopher Gomez, MD, Ph.D., showing that Purkinje-climbing fiber connections are weaker in mouse models of cerebellar ataxia, a movement disorder. On the other hand, Busch, Hansel, and Gomez have published work with former UChicago graduate student Dana Simmons showing these connections are stronger in genetic duplication and overexpression models of autism. Other researchers demonstrate stronger connections in certain types of tremors as well. Understanding more about the essential biological structures of these cells will hopefully provide more insight into these conditions. “People who study other parts of the brain like the neocortex or the hippocampus always have more or less an idea of what that brain structure is doing,” Hansel said. “Those of us who study the cerebellum always had this idea that it’s motor coordination and adaptation, but it was also clear that it was something beyond that. Now it will be easier to grasp as the connectivity becomes clearer.” Reference: “Climbing fiber multi-innervation of mouse Purkinje dendrites with arborization common to human” by Silas E. Busch and Christian Hansel, 27 July 2023, Science. DOI: 10.1126/science.adi1024 The study was funded by the National Institute of Neurological Disorders and Stroke, the National Institute of Neurological Disorders and Stroke, and the University of Chicago Pritzker Fellowship. RRG455KLJIEVEWWF |
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