Dermatoglyphics in Cuban mongols

Area of Science:

• Genetics
• Dermatoglyphics
• Human Biology

Background:

• Down syndrome, also known as trisomy 21, is a genetic disorder associated with characteristic physical features.
• Dermatoglyphics, the study of skin patterns, has been used to investigate genetic conditions.
• Previous studies have identified dermatoglyphic variations in individuals with Down syndrome, but ethnic influences require further investigation.

Purpose of the Study:

• To statistically compare dermatoglyphic patterns between Cuban individuals with Down syndrome and normal Cuban individuals.
• To identify specific dermatoglyphic markers associated with Down syndrome.
• To assess the influence of ethnicity on these dermatoglyphic patterns.

Main Methods:

• Statistical comparison of finger and palm prints from 220 Cuban individuals with Down syndrome (trisomy 21) and 400 normal Cuban individuals.
• Analysis of finger ridge patterns, palm creases, and specific dermatoglyphic features such as fingertip loops, thenar/I area patterns, hypothenar patterns, interdigital patterns, axial triradius position, atd angles, main-line index, C and D line types, simian crease, Sydney line, and parathenar patterns.

Main Results:

• Individuals with Down syndrome exhibited an excess of ulnar loops on the 2nd and 3rd fingers and radial loops on the 4th and 5th fingers.
• A paucity of patterns was observed in the thenar/I area, with more hypothenar true patterns (especially ulnar loops).
• Increased pattern frequencies were noted in the II and III interdigital spaces, with fewer true patterns in the IV interdigital space. Distal positioning of the axial triradius, large atd angles (>70 degrees), high main-line index values, a predominance of the radial type C line, and higher frequencies of D line type 11 were also found. Parathenar patterns were significantly more frequent in patients. The simian crease showed higher diagnostic value than the Sydney line.

Conclusions:

• The dermatoglyphic patterns observed in Cuban individuals with Down syndrome are consistent with findings in other populations.
• Specific dermatoglyphic features, including finger ridge patterns, palm creases, and axial triradius characteristics, serve as significant markers for Down syndrome.
• Ethnic influences do not appear to significantly alter the characteristic dermatoglyphic profile associated with Down syndrome.