What is an Alu repetitive sequence?

What is an Alu repetitive sequence?

Alu sequences are a heterogeneous group of primate-specific interspersed repetitive DNA elements with an estimated frequency of 500 000 to 1 million copies per genome. They may serve as functional polIII genes and are probably derived from 7SL genes.

What does the Alu sequence do?

Alu elements are responsible for regulation of tissue-specific genes. They are also involved in the transcription of nearby genes and can sometimes change the way a gene is expressed. Alu elements are retrotransposons and look like DNA copies made from RNA polymerase III-encoded RNAs.

What is LINE and Alu sequence?

Alu sequences are repetitive DNA Repetitive DNA accounts for at least 20% of the human genome, and has been classified into several different types that include four principal families of interspersed repeats; Alu, Line 1, MIR and MaLR [1].

What the Alu elements are in the human genome?

Alu insertional elements, the most abundant class of SINEs in humans are dimeric sequences approximately 300 bp in length derived from the 7SL RNA gene. These sequences contain a bipartite RNA pol III promoter, a central poly A tract, a 3′ poly A tail, numerous CpG islands and are bracketed by short direct repeats.

Are Alu elements retrotransposons?

Alu elements are highly repetitive DNA sequences that can be classified as SINEs (short interspersed elements), which are themselves a type of “nonautonomous” retrotransposon.

What are types of ALU?

A typical ALU consists of three types of functional parts: storage registers, operations logic, and sequencing logic.

Are Alu elements SINEs?

Where do Alu elements come from?

Alu elements are the most abundant repetitive elements in the human genome; they emerged 65 million years ago from a 5′ to 3′ fusion of the 7SL RNA gene and amplified throughout the human genome by retrotransposition to reach the present number of more than one million copies.

Is ALU a hardware or software?

Computer Software and Hardware – Arithmetic Logic Unit An arithmetic-logic unit (ALU) is the part of a computer processor (CPU) that carries out arithmetic and logic operations. Modern CPUs contain very powerful and complex ALUs. In addition to ALUs, modern CPUs contain a control unit (CU).

What are the two types of satellite DNA?

Satellite DNA structure The short tandem repeats (1-2 bp long) are called microsatellite or simple sequence repeats (SSRs), while the longer tandem repeats (10-60bp long) are called minisatellites or variable number tandem repeats (VNTRs).