Why Is CL/P More Common in Some Groups?
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 2
Researchers count how many babies per live births are born with an oral cleft, and the numbers differ by ancestry. Globally, all oral clefts run about 1 in 700 live births. Asian populations are higher, as high as about 1 in 500; African populations are the lowest at about 1 in 2,500; and Native American or AI-AN communities are described as having among the highest incidence (no exact number is in the sources, so that is qualitative).
Piece 2 of 2
The strongest common risk variant for nonsyndromic CL/P is a SNP called rs987525, on chromosome 8q24 in a stretch of DNA with no protein-coding gene. Its measured effect changes by group: in Europeans the odds ratio is about 2.57 for one copy and 6.05 for two copies (very strong), in southern Han Chinese it is not statistically significant, and in Native-American-ancestry Guatemalan families there is no evidence of association. A second risk variant, rs642961 near IRF6, is a clear risk allele in Europeans but repeatedly fails to replicate in African-ancestry Brazilian samples, where a different IRF6 SNP carries the signal. The rs642961 risk allele is also rarest in African populations (frequency about 0.11) and most common in Native Americans (about 0.27).
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.