KRT3 keratin 3 [Homo sapiens (human)] - Gene

Summary

Official Symbol: KRT3provided by HGNC
Official Full Name: keratin 3provided by HGNC
Primary source: HGNC:HGNC:6440
See related: Ensembl:ENSG00000186442 MIM:148043; AllianceGenome:HGNC:6440
Gene type: protein coding
RefSeq status: REVIEWED
Organism: Homo sapiens
Lineage: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as: K3; CK3; MECD2
Summary: The protein encoded by this gene is a member of the keratin gene family. The type II cytokeratins consist of basic or neutral proteins which are arranged in pairs of heterotypic keratin chains coexpressed during differentiation of simple and stratified epithelial tissues. This type II cytokeratin is specifically expressed in the corneal epithelium with family member KRT12 and mutations in these genes have been associated with Meesmann's Corneal Dystrophy. The type II cytokeratins are clustered in a region of chromosome 12q12-q13. [provided by RefSeq, Jul 2008]
Expression: Low expression observed in reference dataset See more
Orthologs: all
NEW: Try the new Gene table
Try the new Transcript table

Genomic context

Location:: 12q13.13

Exon count:: 9

Annotation release	Status	Assembly	Chr	Location
RS_2024_08	current	GRCh38.p14 (GCF_000001405.40)	12	NC_000012.12 (52789685..52796117, complement)
RS_2024_08	current	T2T-CHM13v2.0 (GCF_009914755.1)	12	NC_060936.1 (52754139..52770193, complement)
RS_2024_09	previous assembly	GRCh37.p13 (GCF_000001405.25)	12	NC_000012.11 (53183469..53189901, complement)

Chromosome 12 - NC_000012.12 Genomic Context describing neighboring genes

Genomic regions, transcripts, and products

Go to the top of the page Help

Go to reference sequence details

Genomic Sequence:

Go to nucleotide: Graphics FASTA GenBank

Bibliography

Go to the top of the page Help

GeneRIFs: Gene References Into Functions

What's a GeneRIF?

Coexistence of Meesmann Corneal Dystrophy and a Pseudo-Unilateral Lattice Corneal Dystrophy in a Patient With a Novel Pathogenic Variant in the Keratin K3 Gene: A Case Report.
Title: Coexistence of Meesmann Corneal Dystrophy and a Pseudo-Unilateral Lattice Corneal Dystrophy in a Patient With a Novel Pathogenic Variant in the Keratin K3 Gene: A Case Report.
RT-PCR showed that K3 and K12 transcripts were absent from patient cells, but present in healthy control preparations.
Title: Human aniridia limbal epithelial cells lack expression of keratins K3 and K12.
we show that the two PAX6 isoforms differentially and cooperatively regulate the expression of genes specific to the structure and functions of the corneal epithelium, particularly keratin 3 (KRT3) and keratin 12 (KRT12). PAX6 isoform-a induced KRT3 expression by targeting its upstream region. KLF4 enhanced this induction. A combination of PAX6 isoform-b, KLF4, and OCT4 induced KRT12 expression
Title: PAX6 Isoforms, along with Reprogramming Factors, Differentially Regulate the Induction of Cornea-specific Genes.
Exon sequencing of KRT3 and KRT12 in six affected and eight unaffected individuals did not detect any mutations or nucleotide sequence variants in Meesmann epithelial corneal dystrophy.
Title: Autosomal-dominant Meesmann epithelial corneal dystrophy without an exon mutation in the keratin-3 or keratin-12 gene in a Chinese family.
Location of the E498V mutation emphasizes the functional relevance of the highly conserved boundary motifs at the COOH-terminus of the alpha-helical rod domain in keratin 3 (K3).
Title: Genetics of Meesmann corneal dystrophy: a novel mutation in the keratin 3 gene in an asymptomatic family suggests genotype-phenotype correlation.
A novel missense mutation (R503P) in KRT3 leads to MCD in 2 unrelated Taiwanese families.
Title: Novel mutations in the helix termination motif of keratin 3 and keratin 12 in 2 Taiwanese families with Meesmann corneal dystrophy.

Submit: New GeneRIF Correction

Phenotypes

Go to the top of the page Help

Find tests for this gene in the NIH Genetic Testing Registry (GTR)

Review eQTL and phenotype association data in this region using PheGenI

Associated conditions

Description	Tests
Corneal dystrophy, Meesmann, 2 MedGen: C5231495 OMIM: 618767 GeneReviews: Not available	Compare labs

Variation

Go to the top of the page Help

See variants in ClinVar

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

See Variation Viewer (GRCh38)

Interactions

Go to the top of the page Help

Products	Interactant	Other Gene	Complex	Source	Pubs	Description

General gene information

Go to the top of the page Help

Markers

RH18078 (e-PCR)
- UniSTS:5197

RH18079 (e-PCR)
- UniSTS:48725

Gene Ontology Provided by GOA

Function	Evidence Code	Pubs
enables protein binding	IPI Inferred from Physical Interaction more info	PubMed
enables structural constituent of skin epidermis	IBA Inferred from Biological aspect of Ancestor more info

Process	Evidence Code	Pubs
involved_in epithelial cell differentiation	ISS Inferred from Sequence or Structural Similarity more info
involved_in intermediate filament cytoskeleton organization	IMP Inferred from Mutant Phenotype more info	PubMed
involved_in intermediate filament organization	IBA Inferred from Biological aspect of Ancestor more info
involved_in keratinization	IBA Inferred from Biological aspect of Ancestor more info

Component	Evidence Code	Pubs
located_in cytosol	TAS Traceable Author Statement more info
located_in extracellular exosome	HDA more info	PubMed
located_in intermediate filament	NAS Non-traceable Author Statement more info	PubMed
is_active_in keratin filament	IBA Inferred from Biological aspect of Ancestor more info
located_in keratin filament	TAS Traceable Author Statement more info	PubMed

General protein information

Go to the top of the page Help

Preferred Names: keratin, type II cytoskeletal 3

Names: 65 kDa cytokeratin; CK-3; cytokeratin 3; keratin 3, type II; type-II keratin Kb3

NCBI Reference Sequences (RefSeq)

Go to the top of the page Help

NEW Try the new Transcript table

RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

Genomic

NG_008350.1 RefSeqGene

Range

4992..11424

Download

GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

NM_057088.3 → NP_476429.2 keratin, type II cytoskeletal 3

See identical proteins and their annotated locations for NP_476429.2

Status: REVIEWED

Source sequence(s)

AC107016, AJ628418, BM672628, CV571376

Consensus CDS

CCDS44895.1

UniProtKB/Swiss-Prot

A6NIS2, P12035, Q701L8

Related

ENSP00000413479.2, ENST00000417996.2

Conserved Domains (3) summary

pfam00038
Location:197 → 512

Filament; Intermediate filament protein

pfam16208
Location:170 → 194

Keratin_2_head; Keratin type II head

cl23720
Location:425 → 486

RILP-like; Rab interacting lysosomal protein-like 1 and 2 (Rilpl1 and Rilpl2)