Category Archives: DNA

Shaun Sinclair week 1 DNA Performance Resource

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Aniversrio Dna Julia
Take 2.

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Claude Young - How is your dna (Marco Bailey Remix)

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exclusive freestyle ft DIZASTER, DNA and CONCEITED
MastaqueTV and DJ Sanchez sit down in the studio with battle rappers Dizaster, DNA and Conceited as they kick an exclusive freestyle! Share it on facebook Pa...

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July 4, 2013 Researchers report that they have found a direct genetic link between the remains of Native Americans who lived thousands of years ago and their living descendants. The team used mitochondrial DNA, which children inherit only from their mothers, to track three maternal lineages from ancient times to the present.

The findings are reported in the journal PLOS ONE.

The researchers compared the complete mitochondrial genomes of four ancient and three living individuals from the north coast of British Columbia, Canada. This region is home to the indigenous Tsimshian, Haida and Nisga'a people, all of whom have oral traditions and some written histories indicating that they have lived in the region for uncounted generations. Archaeological sites, some with human remains, date back several millennia. But until the current study, nothing definitively tied the current inhabitants of the area to the ancient human remains found there, some of which are 5,000 to 6,000 years old.

"Having a DNA link showing direct maternal ancestry dating back at least 5,000 years is huge as far as helping the Metlakatla prove that this territory was theirs over the millennia," said Barbara Petzelt, an author and participant in the study and liaison to the Tsimshian-speaking Metlakatla community, one of the First Nations groups that participated in the study.

Only one previous study of ancient remains found in the Americas -- the hair of an Eskimo man who lived in Greenland 3,400 to 4,500 years ago -- analyzed all of the ancient mitochondrial DNA sequences (the mitochondrial genome, or mitogenome). Most such studies look at only a small subset (less than 2 percent) of mitogenomic sequences.

The new analysis was made possible by technological advances that cut the cost and complexity of sequencing ancient DNA.

"This is the beginning of the golden era for ancient DNA research because we can do so much now that we couldn't do a few years ago because of advances in sequencing technologies," said University of Illinois anthropology and Institute for Genomic Biology professor Ripan Malhi, who led the analysis. "We're just starting to get an idea of the mitogenomic diversity in the Americas, in the living individuals as well as the ancient individuals."

Focusing on the mitogenome is a good way to study the evolutionary history of these groups, Malhi said. DNA is often degraded in ancient remains, and unlike nuclear DNA, which is present in only two copies per cell, mitochondria are abundant in cells, giving researchers many DNA duplicates to sequence and compare.

Mitochondrial DNA does not recombine with paternal DNA and is passed down from mother to offspring more or less intact. This makes it easier to track unique sequences through the generations. And since the participants in the study belong to matrilineal cultures, their oral histories can be compared to evidence from the maternal lineages reflected in the mitogenome.

Another complication associated with analyzing nuclear DNA in Native Americans involves the European influence, Malhi said.

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Study of mitochondrial DNA ties ancient remains to living descendants

An expert witness testified Wednesday that none of George Zimmerman's DNA was found under the fingernails of Trayvon Martin, despite defense attempts to portray Zimmerman as only firing his gun in self-defense.

Crime lab analyst Anthony Gorgone testified no DNA samples taken from Martin's fingernails matched that of Zimmerman, a Florida neighborhood watch volunteer charged with killing the teenager during a scuffle.

Gorgone also testified that two different DNA profiles were found on the pistol grip. One was Zimmerman's but the other could not be identified. However, Gorgone said he was able to determine that it did not match Martin's DNA sequence.

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Zimmerman's DNA was found on Martin's sweatshirt, beneath his hoodie. Martin's DNA was found on Zimmerman's jacket.

During cross-examination, defense attorney Don West attempted to highlight potential problems with DNA evidence, pointing out that only one swab was used on Martin's fingernails while four were used on Zimmerman's pistol.

West also asked Gorgone if the fact that Martin's sweatshirt was still wet when it was bagged for evidence could compromise any DNA samples.

"The clothing should have been air dried before it was packaged or at least packaged in paper bags?" West asked Gorgone, who replied, "Ideally you would like to air dry them before package. On top of that our agencies are encouraged not to place them in plastic bags."

Martin's mother, Sybrina Fulton is expected to take the stand when court reconvenes on Friday morning.

Both of Martin's parents have been present for the trial every day.

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Expert: No Zimmerman DNA under Martin fingernails - GAVEL-TO-GAVEL COVERAGE: Zimmerman Trial

Florida Department of Law Enforcement Crime Lab Analyst Anthony Gorgone points to a jacket worn by George Zimmerman on the night Zimmerman shot Trayvon Martin during the George Zimmerman trial in Seminole circuit court, July 3, 2013 in Sanford, Florida.

(CBS) --Slain Florida teen Trayvon Martin's DNA wasn't detected on George Zimmerman's gun, a Florida Department of Law Enforcement DNA analyst testified Wednesday.

PICTURES: George Zimmerman on trial in death of Fla. teen

PICTURES: George Zimmerman crime scene photos

READ: Trayvon Martin Shooting: A timeline of events

Anthony Gorgone also testified that George Zimmerman's DNA wasn't found under the teen's fingernails.

Zimmerman, a former neighborhood watch captain charged in Martin's shooting death, claims he killed the teen in self-defense during an altercation last year in a Sanford, Fla. gated community. Zimmerman said Martin slammed his head into a sidewalk and reached for his gun before he fatally shot the teen. He is charged with second-degree murder.

In court Wednesday, attorneys displayed items of clothing Zimmerman and Martin were wearing the night of the fatal altercation that Gorgone tested for DNA, including Martin's hoodie and Zimmerman's red jacket.

Gorgone said he didn't detect any DNA that wasn't Martin's on the cuffs and sleeves of Martin's hoodie.

VIDEO: Zimmerman trial: Prosecutor opens with profanity

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DNA Analyst: Martin's DNA not on Zimmerman's gun

A forensics expert testified Wednesday that no DNA from slain teenager Trayvon Martin was found on the gun George Zimmerman used to shoot him. Zimmerman has reportedly said Trayvon tried to grab the gun as the two fought.

Teenager Trayvon Martin's DNA was nowhere to be found on the gun George Zimmerman used to fatally shoot him, a forensics expert testified Wednesday a development that may cast doubt on the contention that the 17-year-old tried to grab the gun during a fight with Mr. Zimmerman in a gated community in Sanford, Fla.

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The gun grab features in Zimmermans explanation of how he came to shoot and kill the unarmed black teenager in February 2012.

The testimony of a state forensic expert, Anthony Gorgone, provided rare bits of hard evidence in the second-degree murder case. It came amid commentators' doubts that the state has been able to prove that Zimmerman murdered Trayvon after illegally profiling him as a possible criminal.

Mr. Gorgone said he found none of Trayvons DNA on Zimmermans 9mm Kel-Tec pistol. Zimmerman has asserted, to police and to a friend, that Trayvon had grabbed for the gun before Zimmerman fired.

Mark Osterman, Zimmermans best friend and the author of a book defending him, testified Tuesday that Zimmerman told him on the night of the shooting that Trayvon briefly grabbed his gun as the two wrestled on the ground. Mr. Osterman said Zimmerman said to him, somehow I broke his grip on the gun when guy grabbed between the grip and the hammer.

Gorgone also testified he found none of Zimmermans DNA under Trayvon Martins fingernails. Zimmerman has said Travyon was beating him badly before he fired into the teenagers chest. Nor did he find anything "that matched [Zimmerman]" onTrayvon's hoodie, including on either of the lower sleeves of the sweatshirt, he said.

Defense attorneys, for their part, got Gorgone to acknowledge that environmental conditions such as humidity or rain could have washed surfaces clean of DNA.

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Gun grab? No Trayvon Martin DNA on George Zimmerman gun, expert says (+video)

SANFORD, Fla. Trayvon Martin's DNA was not found on the grip of George Zimmerman's gun, and Zimmerman's DNA was not found under the unarmed teen's fingernails, a law enforcement expert said Wednesday in testimony that prosecutors hope will refute the neighborhood watch volunteer's self-defense claim.

Zimmerman has pleaded not guilty to second-degree murder and says he shot the 17-year-old in the chest to protect himself as Martin reached for his firearm during a fight.

Florida Department of Law Enforcement DNA expert Anthony Gorgone also testified that Zimmerman's DNA was among blood on a shirt Martin was wearing under his hooded sweat shirt.

While cross-examining Gorgone, defense attorney Don West focused on the packaging of the DNA samples, suggesting they could have led to the samples being degraded. Gorgone told him that Martin's two sweat shirts had been packaged in plastic while wet, instead of a paper bag where they can dry out, and when he opened the samples they smelled of ammonia and mold.

Florida Department of Law Enforcement analyst Amy Siewert also testified that tearing and residue on Martin's clothing showed the gun was directly against him when it fired.

Prosecutors have sought to portray Zimmerman as a vigilante who profiled Martin as the teen walked home on a rainy night.

They called Gorgone on the same day they presented evidence that they say shows Zimmerman had aspirations of becoming a police officer and knew about Florida's "stand-your-ground" law, which says a person has no duty to retreat and can invoke self-defense in killing someone if it is necessary to prevent death or great bodily harm.

Zimmerman had maintained in an interview with Fox News last year that he did not know about the law.

Prosecutors say he did have knowledge of it, however, because the subject was covered in a college class on criminal justice Zimmerman attended.

They called as a witness Alexis Francisco Carter, the military attorney who taught the class. Carter described Zimmerman as one of his better students and said the neighborhood watch volunteer got an "A" in his class.

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Zimmerman trial: Expert says Martin's DNA not on gun grip

The DNA Show - June 29, 2013 Episode (Zsarina Concepcion)
The DNA Show - June 29, 2013 Episode Featuring Zsarina Concepcion Hosted by: Danny, Nirro and Aldrin co-hosted by Renz and Patrick More Original Videos at ww...

By: Nirro Marcelo

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