Genetic mutation linked to Jewish ancestry found in San Luis Valley Hispanics

Fascinating piece in the Smithsonian:

One September day in 2001, Teresa Castellano, Lisa Mullineaux, Jeffrey Shaw and Lisen Axell were having lunch in Denver. Genetic counselors from nearby hospitals and specialists in inherited cancers, the four would get together periodically to talk shop. That day they surprised one another: they'd each documented a case or two of Hispanic women with aggressive breast cancer linked to a particular genetic mutation. The women had roots in southern Colorado, near the New Mexico border. "I said, 'I have a patient with the mutation, and she's only in her 40s,'" Castellano recalls. "Then Lisa said that she had seen a couple of cases like that. And Jeff and Lisen had one or two also. We realized that this could be something really interesting."

Curiously, the genetic mutation that caused the virulent breast cancer had previously been found primarily in Jewish people whose ancestral home was Central or Eastern Europe. Yet all of these new patients were Hispanic Catholics.

Mullineaux contacted Ruth Oratz, a New York City-based oncologist then working in Denver. "Those people are Jewish," Oratz told her. "I'm sure of it."

Pooling their information, the counselors published a report in a medical journal about finding the gene mutation in six "non-Jewish Americans of Spanish ancestry." The researchers were cautious about some of the implications because the breast cancer patients themselves, as the paper put it, "denied Jewish ancestry."

The finding raised some awkward questions. What did the presence of the genetic mutation say about the Catholics who carried it? How did they happen to inherit it? Would they have to rethink who they were—their very identity—because of a tiny change in the three billion "letters" of their DNA? More important, how would it affect their health, and their children's health, in the future?

Some people in the valley were reluctant to confront such questions, at least initially, and a handful even rejected the overtures of physicians, scientists and historians who were suddenly interested in their family histories. But rumors of secret Spanish Jewry had floated around northern New Mexico and the San Luis Valley for years, and now the cold hard facts of DNA appeared to support them. . . .

Crypto-Jews! One parish priest now displays a menorah in his church. Anyway, a good excuse to post a pic or two of the San Luis Valley:






(via an LGF spinoff link from "archigabe")