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HHaA
KRT41P, formerly KRTHAP1 (also known as ΨhHaA, ''h'' prefix for "human") is a human pseudogene that used to code for a keratin. It is believed to be responsible for fur-like body hair Body hair, or androgenic hair, is the terminal hair that develops on the human body during and after puberty. It is differentiated from the head hair and less visible vellus hair, which is much finer and lighter in color. The growth of androge .... There is still variation in the degree of body hair among human beings and occasional examples have been found of people where the gene is active leading to very thick body hair as a result. Although the mutation was dated to 240 000 by Winter et al., it is also present in the Vindija Neandertal and Altai Denisovan sequences. Hence the dating must be older than 700 00 kya and possibly more than 1 mya considering the latter's divergence date. Given the divergence of pubic and head hair lice, the date of the mutation may be as old as 3.3 million years o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudogene
Pseudogenes are nonfunctional segments of DNA that resemble functional genes. Most arise as superfluous copies of functional genes, either directly by DNA duplication or indirectly by Reverse transcriptase, reverse transcription of an mRNA transcript. Pseudogenes are usually identified when genome sequence analysis finds gene-like sequences that lack regulatory sequences needed for Transcription (biology), transcription or Translation (biology), translation, or whose coding sequences are obviously defective due to Frameshift mutation, frameshifts or premature stop codons. Most non-bacterial genomes contain many pseudogenes, often as many as functional genes. This is not surprising, since various biological processes are expected to accidentally create pseudogenes, and there are no specialized mechanisms to remove them from genomes. Eventually pseudogenes may be deleted from their genomes by chance DNA replication or DNA repair errors, or they may accumulate so many mutational cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
