I thought an HIR was the same thing as a shared segment, because a shared segment has the same definition as Tom's HIR. Jim - Sent from my iPhone - FaceTime! On Oct 19, 2013, at 10:59 PM, "Tim Janzen" <tjanzen@comcast.net> wrote: > Dear Karen, > HIR stands for half-identical region. It is an extremely important > term for genetic genealogists interested in autosomal DNA to understand > well. Because I couldn't find a good definition for an HIR 9 months or so > ago, I wrote my own. It is as follows: > > Half-identical region: a region of two paired chromosomes where at least > one of the two alleles from one person's pair of chromosomes matches at > least one of the two alleles from a different person's pair of chromosomes > throughout the entire region. A half-identical region may be either > identical by descent (IBD) or identical by state (IBS). > > Some scientists use IBS to mean an HIR. I think things are simpler and > clearer if you use the term HIR in the right context and use IBS only for > HIRs that are false matches (not the result of a shared common ancestor for > the HIR in question). This topic came up on the RootsWeb DNA list in 2009 > shortly after 23andMe released Relative Finder. Ann Turner's comments at > http://archiver.rootsweb.ancestry.com/th/read/GENEALOGY-DNA/2009-11/12572588 > 09 are instructive. > Sincerely, > Tim Janzen > > -----Original Message----- > From: autosomal-dna-bounces@rootsweb.com > [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of Karen Hodges > Sent: Saturday, October 19, 2013 2:29 PM > To: autosomal-dna@rootsweb.com > Subject: Re: [AUTOSOMAL-DNA] Family finder matches what to make of them > > What is HIR short for please? > > Karen
I agree with Tim, the Net doesn't have a good definition of HIR. Here's a few definitions online: FTDNA: A half identical region (HIR) is when two people's share a DNA segment that half matches. The half identical region may be either identical by descent (IBD) or identical by state (IBS). 23andMe Family Traits: Genome View shows which parts of two related people's genomes appear to be inherited from a common ancestor. In reality, the genome is organized into 22 pairs of chromosomes, plus the sex chromosomes (two X, or one X and one Y). We show only one chromosome out of each pair, but we color them to show whether one copy is identical (i.e. half-identical), or both copies are identical (i.e. completely identical) between two people. DNA Testing and Genealogy (http://www.johnbrobb.com/JBRdna.htm) half-identical said of two humans who share at least one allele value at a particular SNP. Long consecutive stretches of half-identical sampled SNPs, measured in CM's (centimorgans, which adjust for the variant rates of crossover in different chromosomes) are indicative of a shared descent from a common ancestor. The term HIR is sometimes used to mean half-identical region, whose length may be quantified either in cMs or in the number of SNPs. The principle testing companies at present, 23andME, and FTDNA, consider anywhere from 5-7 cMs (or about 500-700 SNPs) to be the minimum length to be possibly indicative of a reasonably close cousin relationship. E -----Original Message----- From: autosomal-dna-bounces@rootsweb.com [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of Jim Bartlett Sent: Saturday, October 19, 2013 8:21 PM To: autosomal-dna@rootsweb.com Subject: Re: [AUTOSOMAL-DNA] Family finder matches what to make of them I thought an HIR was the same thing as a shared segment, because a shared segment has the same definition as Tom's HIR. Jim - Sent from my iPhone - FaceTime! On Oct 19, 2013, at 10:59 PM, "Tim Janzen" <tjanzen@comcast.net> wrote: > Dear Karen, > HIR stands for half-identical region. It is an extremely important > term for genetic genealogists interested in autosomal DNA to > understand well. Because I couldn't find a good definition for an HIR > 9 months or so ago, I wrote my own. It is as follows: > > Half-identical region: a region of two paired chromosomes where at > least one of the two alleles from one person's pair of chromosomes > matches at least one of the two alleles from a different person's pair > of chromosomes throughout the entire region. A half-identical region > may be either identical by descent (IBD) or identical by state (IBS). > > Some scientists use IBS to mean an HIR. I think things are simpler > and clearer if you use the term HIR in the right context and use IBS > only for HIRs that are false matches (not the result of a shared > common ancestor for the HIR in question). This topic came up on the > RootsWeb DNA list in 2009 shortly after 23andMe released Relative > Finder. Ann Turner's comments at > http://archiver.rootsweb.ancestry.com/th/read/GENEALOGY-DNA/2009-11/12 > 572588 > 09 are instructive. > Sincerely, > Tim Janzen > > -----Original Message----- > From: autosomal-dna-bounces@rootsweb.com > [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of Karen Hodges > Sent: Saturday, October 19, 2013 2:29 PM > To: autosomal-dna@rootsweb.com > Subject: Re: [AUTOSOMAL-DNA] Family finder matches what to make of > them > > What is HIR short for please? > > Karen ______________________________ For answers to Frequently Asked Questions about mailing lists, please see: http://dgmweb.net/MailingListFAQs.html ------------------------------- To unsubscribe from the list, please send an email to AUTOSOMAL-DNA-request@rootsweb.com with the word 'unsubscribe' without the quotes in the subject and the body of the message
Jim, I suppose most of the time a shared segment IS an HIR, but occasionally it could be fully identical (parents and siblings, mainly). On Sat, Oct 19, 2013 at 11:20 PM, Jim Bartlett <jim4bartletts@verizon.net>wrote: > I thought an HIR was the same thing as a shared segment, because a shared > segment has the same definition as Tom's HIR. > > Jim - Sent from my iPhone - FaceTime! > > On Oct 19, 2013, at 10:59 PM, "Tim Janzen" <tjanzen@comcast.net> wrote: > > > Dear Karen, > > HIR stands for half-identical region. It is an extremely important > > term for genetic genealogists interested in autosomal DNA to understand > > well. Because I couldn't find a good definition for an HIR 9 months or > so > > ago, I wrote my own. It is as follows: > > > > Half-identical region: a region of two paired chromosomes where at least > > one of the two alleles from one person's pair of chromosomes matches at > > least one of the two alleles from a different person's pair of > chromosomes > > throughout the entire region. A half-identical region may be either > > identical by descent (IBD) or identical by state (IBS). > > > > Some scientists use IBS to mean an HIR. I think things are simpler and > > clearer if you use the term HIR in the right context and use IBS only for > > HIRs that are false matches (not the result of a shared common ancestor > for > > the HIR in question). This topic came up on the RootsWeb DNA list in > 2009 > > shortly after 23andMe released Relative Finder. Ann Turner's comments at > > > http://archiver.rootsweb.ancestry.com/th/read/GENEALOGY-DNA/2009-11/12572588 > > 09 are instructive. > > Sincerely, > > Tim Janzen > > > > -----Original Message----- > > From: autosomal-dna-bounces@rootsweb.com > > [mailto:autosomal-dna-bounces@rootsweb.com] On Behalf Of Karen Hodges > > Sent: Saturday, October 19, 2013 2:29 PM > > To: autosomal-dna@rootsweb.com > > Subject: Re: [AUTOSOMAL-DNA] Family finder matches what to make of them > > > > What is HIR short for please? > > > > Karen > > > > ______________________________ > For answers to Frequently Asked Questions about mailing lists, please see: > http://dgmweb.net/MailingListFAQs.html > > > ------------------------------- > To unsubscribe from the list, please send an email to > AUTOSOMAL-DNA-request@rootsweb.com with the word 'unsubscribe' without > the quotes in the subject and the body of the message >