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Cells that make up the cartilage at the end of children’s and teens’ bones determine their future length and shape, which, in turn, affect height.  (Image credit: Marko Geber via Getty Images)

Scientists have pinpointed 145 potential “height genes” in cells that make up the cartilage at the ends of children’s bones and affect how tall they grow.

These cartilage cells, known as chondrocytes, multiply and mature in areas of tissue called growth plates, which sit near the ends of long bones in children and teens and determine each bone’s future length and shape. When a person’s growth is complete, these cartilaginous growth plates “close” and are replaced by hard bone. Scientists already knew that chondrocytes play a role in bone growth and human height, but narrowing down which genes control the cells’ growth — and, thus, our statures — has proved difficult.

“Pinpointing specific genes associated with human height is a challenging task, as height is a complex trait that is influenced by both genetic and environmental factors,” Dr. Nora Renthal (opens in new tab) , a pediatric endocrinologist at Boston Children’s Hospital and Harvard Medical School and senior of the new study, told Live Science in an email. “Our study focused on cartilage cells specifically because they are the primary cell type involved in bone growth.”

In a study published Friday (April 14) in the journal Cell Genomics (opens in new tab) , Renthal and her colleagues screened 600 million mouse cartilage cells to find genes that influence how the cells proliferate and mature. They used CRISPR genome-editing technology to “knock out” candidate genes, which allowed the researchers to observe what happened when these genes were erased and no longer regulated cartilage cells.

Related: What determines a person’s height? 

The researchers found 145 genes that, when knocked out, triggered abnormal growth and development of mouse cartilage cells. These patterns of abnormal growth were similar to those seen in certain skeletal disorders, such as skeletal dysplasia — a group of genetic disorders that affect the development of bones, joints and cartilage in babies. Those with skeletal dysplasia are typically of short stature and have short limbs, among other symptoms.

Next, the researchers compared these 145 mouse genes with previous results from large-scale genetic studies of human height, called genome-wide association studies (GWAS). In those studies, researchers compared the DNA of thousands of people of different heights to look for gene variants associated with height, Renthal explained. To control for non-genetic factors that influence the trait under study, such as nutrition and disease in the case of human height, these factors are incorporated into GWAS, according to a 2021 review published in the journal Nature Reviews Methods Primers (opens in new tab) .

“These studies have contributed to our understanding of the genetic basis of complex traits like height by identifying specific genetic regions and genes that are associated with the trait,” Renthal said.

The comparison revealed a remarkable overlap between genetic “hotpots” linked to human height in the GWAS and the 145 genes that control cartilage cell growth in mice. This means that these genes, which the researchers have now precisely located in the human genome, could influence height more than other genetic factors do.RELATED STORIES—More than 150 ‘made-from-scratch’ genes are in the human genome. 2 are totally unique to us.

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“Our current study has helped to identify new genes potentially involved in bone growth and development,” Renthal said. “Specific genes and pathways involved in the maturation and proliferation of chondrocytes, the cells that make up cartilage in our bones, play a critical role in human height.”

Results from mouse cells may not mirror cellular processes in humans, Renthal noted in a statement (opens in new tab) , but the researchers think height genes could come in handy in clinical settings. 

“It is our hope that the identification of these 145 genes will help patients with skeletal dysplasia and other skeletal disorders,” Renthal told Live Science.

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Penn State fires Franklin amid midseason free fall

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Penn State fires Franklin amid midseason free fall

Penn State has fired coach James Franklin after 12 seasons, the school announced Sunday.

Franklin is owed more than $49 million, according to his contract. It’s the second-biggest buyout in college football history behind only Jimbo Fisher’s $76 million buyout from Texas A&M.

Associate head coach Terry Smith will serve as the Nittany Lions’ interim head coach for the remainder of the season, the school said.

Less than a year removed from an appearance in the College Football Playoff semifinals, Franklin’s program appeared to hit a new low when the Nittany Lions traveled out to Los Angeles two weeks ago only to lose to UCLA, a team that not only was winless but hadn’t previously held a lead all season.

The woes flew back home with the team to Penn State, and with them came “Fire Franklin!” chants at Beaver Stadium on Saturday. The Nittany Lions dropped their second straight home game, and third overall, when they fell to Northwestern 22-21 in front of a stunned crowd at Happy Valley.

With the two losses, Penn State became the first team since the FBS and FCS split in 1978 to lose consecutive games while favored by 20 or more points in each game, according to ESPN Research.

In Saturday’s defeat to the Wildcats, the Nittany Lions committed six penalties for 71 yards in the first half alone. They simply could never get out of their own way, and that was before quarterback Drew Allar suffered a season-ending injury in the fourth quarter.

Earlier in the season, when the losing streak began against Oregon at Happy Valley, Franklin fell to 4-21 at Penn State against AP top-10 opponents, including 1-18 against top-10 Big Ten teams.

Franklin’s .160 winning percentage against AP top-10 teams is tied for the third-worst record by a coach (minimum 25 games) at a single school since the poll era began in 1936, according to ESPN Research.

Hired in 2014 in the wake of Bill O’Brien’s departure for the NFL, Franklin inherited a team still feeling the effects of unprecedented NCAA sanctions in the wake of Jerry Sandusky’s sexual-abuse crimes.

Armed with relentless optimism and an ability to recruit, Franklin’s program regularly churned out NFL-level talent, from Philadelphia Eagles running back Saquon Barkley to Green Bay Packers edge rusher Micah Parsons. Franklin guided the Nittany Lions to the 2016 Big Ten title and a seemingly permanent spot in the rankings.

There was hope this fall might be the season when Penn State would finally break through and win its third national championship and first since 1986. Yet after three easy wins during a light nonconference schedule, the Nittany Lions crumbled.

Athletic director Pat Kraft said the school owes Franklin an “enormous amount of gratitude” for leading the Nittany Lions back to relevance but felt it was time to make a change.

“We hold our athletics programs to the highest of standards, and we believe this is the right moment for new leadership at the helm of our football program to advance us toward Big Ten and national championships,” Kraft said.

The move will cost Penn State at a time the athletic department has committed to a $700 million renovation to Beaver Stadium. The project is expected to be completed by 2027.

Former athletic director Sandy Barbour signed Franklin to a 10-year contract extension worth up to $85 million in 2021. According to terms of the deal, Penn State will have to pay Franklin’s base salary of $500,000, supplemental pay of $6.5 million and an insurance loan of $1 million until 2031.

It’s a steep price, but one the university appears willing to pay to find a coach who can complete the climb to a national title.

“We have the best college football fans in America, a rich tradition of excellence, significant investments in our program, compete in the best conference in college sports and have a state-of-the-art renovated stadium on the horizon,” Kraft said. “I am confident in our future and in our ability to attract elite candidates to lead our program.”

The Associated Press contributed to this report.

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Hoosiers vault to No. 3 in poll; Texas, USC back in

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Hoosiers vault to No. 3 in poll; Texas, USC back in

Indiana moved up to No. 3 in the Associated Press college football poll Sunday for its highest ranking in program history, while Texas and USC were among five teams entering the Top 25 after eight ranked teams — three of them previously unbeaten — lost over the weekend.

Ohio State and Miami remained the top two teams while the Hoosiers earned a four-spot promotion for their 10-point win at then-No. 3 Oregon. No. 4 Texas A&M and No. 5 Ole Miss traded places after the Aggies’ 17-point home win over Florida and the Rebels’ three-point home win over Washington State.

The Buckeyes strengthened their hold on No. 1 with a solid road win against then-No. 17 Illinois and received 50 first-place votes, 10 more than last week. Miami, which was idle, earned 13 first-place votes, and Indiana got the other three.

Texas A&M has its highest ranking in a regular season since it was No. 3 in September 1995.

Alabama moved up two spots to No. 6 and was followed by Texas Tech, Oregon, Georgia and LSU. Oregon dropped five spots and has its lowest ranking in 20 polls since it was No. 8 in September 2024.

Indiana’s groundbreaking run under second-year coach Curt Cignetti has been one of the biggest stories in college football since last season. The Hoosiers went into the Oregon game 0-46 on the road against top-five teams and, before Sunday, had never been ranked higher than No. 4. Their three first-place votes are their most in a poll since they got the same number when they were ranked No. 6 on Nov. 5, 1945.

Oklahoma plunged eight spots to No. 14 with its first loss, 23-6 to Texas. The Longhorns were the preseason No. 1 team, but a season-opening loss at Ohio State and Week 6 loss at Florida dropped them out of the Top 25.

In beating the rival Sooners, the Longhorns held a top-10 opponent without a touchdown for the first time since 1979 and reentered the poll at No. 21. It was Texas’ first win of the season against a ranked opponent, and another won’t be on the schedule for at least three weeks.

Missouri, which started 5-0, fell two spots to No. 16 after its three-point home loss to Alabama.

No. 20 USC, ranked twice in September, returned to the rankings on the strength of its 18-point home win over Michigan.

No. 23 Utah is back after a three-week absence following a 32-point win over Arizona State.

No. 24 Cincinnati beat Central Florida at home for its fifth straight win and is ranked for the first time since 2022.

No. 25 Nebraska came from behind to beat Maryland on the road and has its first ranking of the season. It is the first time since the 2013 and 2014 seasons that the Cornhuskers have been ranked in consecutive seasons.

Five teams — Michigan (15), Illinois (17), Arizona State (21), Iowa State (22) and Florida State (25) — dropped out of the poll, marking the most turnover in a regular-season poll since seven teams fell out on Oct. 2, 2022.

CONFERENCE CALL

SEC (10): Nos. 4, 5, 6, 9, 10, 11, 14, 16, 17, 21
Big Ten (5): Nos. 1, 3, 8, 20, 25
Big 12 (4): Nos. 7, 15, 23, 24
ACC (3): Nos. 2, 12, 18
American (2): Nos. 19, 22
Independent (1): No. 13

RANKED VS. RANKED

No. 5 Ole Miss (6-0) at No. 9 Georgia (5-1): Judging by their close call against Washington State, the Rebels might have been looking ahead to this one. They have lost six straight in Athens since 1996.

No. 10 LSU (5-1) at No. 17 Vanderbilt (5-1): The Tigers have won 10 straight in the series. Both teams will be ranked in this matchup for the first time since 1947.

No. 11 Tennessee (5-1) at No. 6 Alabama (5-1): This game is a Top 25 matchup for the fifth straight year. Both teams are coming off hard-fought, three-point wins.

No. 20 USC (5-1) at No. 13 Notre Dame (4-2): High stakes in this storied series with both teams clinging to playoff hopes.

No. 23 Utah (5-1) at No. 15 BYU (6-0): First Top 25 matchup in this one since 2009. Last year, the Cougars benefited from a questionable fourth-down defensive holding penalty before kicking a field goal with 4 seconds left for a 22-21 win.

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High-profile ’27 recruits pull Penn State pledges

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High-profile '27 recruits pull Penn State pledges

Penn State suffered an immediate hit on the recruiting trail Sunday, will a slew of recruits decommitting in the aftermath of the school’s decision to fire head coach James Franklin following 12 seasons with the program.

Less than an hour after Franklin was fired, four-star 2027 recruit Kemon Spell, the No. 1 running back in the 2027 cycle and the No. 15 player overall in the ESPN Junior 300, decommitted from the Nittany Lions, sources told ESPN.

Two other ESPN Junior 300 recruits — offensive tackle Layton Von Brandt (No. 35 overall) and cornerback Gabriel Jenkins (No. 242) — also announced Sunday that they’d be decommitting from Penn State’s 2027 recruiting class upon news of the coaching change.

With four-star wide receiver Khalil Taylor (No. 66 overall) decommitting on Friday, a once-promising Nittany Lions class in the 2027 cycle no longer holds a single pledge.

As for the 2026 class, which entered Sunday ranked 17th nationally, three-star wide receiver Lavar Keys is the lone prospect to decommit in the immediate wake of Franklin’s exit. However, it is suddenly vulnerable less than two months out from the December early signing period.

High-profile commits from the SC Next ESPN 300 include wide receiver Davion Brown (No. 71 overall), offensive tackle Kevin Brown (No. 80) and running Messiah Mickens (No. 135), as well as quarterback pledge Troy Huhn (No. 186), and they could attract significant flip interest from across the country over the remainder of the cycle as Penn State navigates its post-Franklin future.

“We believe this is the right moment for new leadership at the helm of our football program to advance us toward Big Ten and national championships,” Penn State athletic director Patrick Kraft said in a statement.

The Nittany Lions consistently recruited among the top programs in the Big Ten across Franklin’s tenure, topping out with the nation’s No. 4 class in the 2018 cycle, when Penn State signed five-stars Micah Parsons and Justin Shorter.

The program finished in the top 15 of ESPN’s recruiting rankings in each of the past four cycles with quarterback Drew Allar and running backs Kaytron Allen and Nicholas Singleton — all members of the program’s 2025 roster — among the top additions over that span.

The school announced Sunday that associate head coach Terry Smith will serve as Penn State’s interim head coach for the remainder of the season. Riding a three-game losing streak, the Nittany Lions (3-3) travel to face Iowa in Week 8.

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