KRT12 keratin 12 [Homo sapiens (human)] - Gene

Summary

Official Symbol: KRT12provided by HGNC
Official Full Name: keratin 12provided by HGNC
Primary source: HGNC:HGNC:6414
See related: Ensembl:ENSG00000187242 MIM:601687; AllianceGenome:HGNC:6414
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: K12; MECD1
Summary: KRT12 encodes the type I intermediate filament chain keratin 12, expressed in corneal epithelia. Mutations in this gene lead to Meesmann corneal dystrophy. [provided by RefSeq, Jul 2008]
Expression: Low expression observed in reference dataset See more
Orthologs: mouse all
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Genomic context

Location:: 17q21.2

Exon count:: 8

Annotation release	Status	Assembly	Chr	Location
RS_2023_10	current	GRCh38.p14 (GCF_000001405.40)	17	NC_000017.11 (40861303..40867223, complement)
RS_2023_10	current	T2T-CHM13v2.0 (GCF_009914755.1)	17	NC_060941.1 (41725618..41731542, complement)
105.20220307	previous assembly	GRCh37.p13 (GCF_000001405.25)	17	NC_000017.10 (39017555..39023475, complement)

Chromosome 17 - NC_000017.11 Genomic Context describing neighboring genes

Genomic regions, transcripts, and products

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Go to reference sequence details

Genomic Sequence:

Go to nucleotide: Graphics FASTA GenBank

Expression

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See details

Project title: HPA RNA-seq normal tissues
Description: RNA-seq was performed of tissue samples from 95 human individuals representing 27 different tissues in order to determine tissue-specificity of all protein-coding genes
BioProject: PRJEB4337
Publication: PMID 24309898
Analysis date: Wed Apr 4 07:08:55 2018

Bibliography

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GeneRIFs: Gene References Into Functions

What's a GeneRIF?

We identified a heterozygous genetic mutation (c.394 C>G, p.L132V) in the KRT12 gene in six Japanese patients with inherited Meesmann corneal dystrophy. This is the first study to confirm this genetic mutation in Japanese Meesmann corneal dystrophy patients. This mutation has been independently reported in an American Meesmann corneal dystrophy patient, confirming its pathogenicity.
Title: In vivo histology and p.L132V mutation in KRT12 gene in Japanese patients with Meesmann corneal dystrophy.
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.
KC can co-exist with GCD. The missense mutation (c.370G > A) in the TGFBI gene and insert mutation (c.1456-1457ins GAT) in the KRT12 gene were identified in a 23-year-old male patient with concurrent KC and GCD.
Title: Mutation analysis of TGFBI and KRT12 in a case of concomitant keratoconus and granular corneal dystrophy.
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.
Combined with an effective delivery vehicle this siRNA approach represents a viable treatment option for prevention of the MECD pathology observed in K12-Leu132Pro heterozygous individuals.
Title: siRNA silencing of the mutant keratin 12 allele in corneal limbal epithelial cells grown from patients with Meesmann's epithelial corneal dystrophy.
We identified a novel missense mutation of the KRT12 gene in Meesmann corneal dystrophy. The in vivo confocal microscopy examinations revealed previously unreported depth-dependent ultrastructural changes in the living cornea.
Title: KRT12 mutations and in vivo confocal microscopy in two Japanese families with Meesmann corneal dystrophy.
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.
The Leu132Pro missense mutation is within the helix-initiation motif of the keratin and is predicted to result in a significant structural change of the K12 protein.
Title: Severe Meesmann's epithelial corneal dystrophy phenotype due to a missense mutation in the helix-initiation motif of keratin 12.
The lead siRNA, with an IC(50) of thirty picomolar, showed no keratin off-target effects or activation of TLR3 in the concentration ranges tested.
Title: Allele-specific siRNA silencing for the common keratin 12 founder mutation in Meesmann epithelial corneal dystrophy.
Novel missense mutation within the highly conserved helix-initiation motif of KRT12 causing Meesmann's corneal dystrophy in a German family.
Title: Identification of a novel mutation in the cornea specific keratin 12 gene causing Meesmann's corneal dystrophy in a German family.

Submit: New GeneRIF Correction See all GeneRIFs (16)

Phenotypes

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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, 1 MedGen: C5231499 OMIM: 122100 GeneReviews: Not available	Compare labs

Variation

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See variants in ClinVar

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

See Variation Viewer (GRCh38)

Interactions

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Products	Interactant	Other Gene	Complex	Source	Pubs	Description

General gene information

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Markers

RH46938 (e-PCR)
- UniSTS:64513

NoName (e-PCR)
- UniSTS:480934

NoName (e-PCR)
- UniSTS:494782

Gene Ontology Provided by GOA

Function	Evidence Code	Pubs
enables structural molecule activity	IEA Inferred from Electronic Annotation more info

Process	Evidence Code	Pubs
involved_in cornea development in camera-type eye	IMP Inferred from Mutant Phenotype more info	PubMed
involved_in epithelial cell differentiation	IBA Inferred from Biological aspect of Ancestor more info
involved_in intermediate filament organization	IBA Inferred from Biological aspect of Ancestor more info
involved_in morphogenesis of an epithelium	IBA Inferred from Biological aspect of Ancestor more info
involved_in morphogenesis of an epithelium	IMP Inferred from Mutant Phenotype more info	PubMed
involved_in visual perception	TAS Traceable Author Statement more info	PubMed

Component	Evidence Code	Pubs
is_active_in cytoskeleton	IBA Inferred from Biological aspect of Ancestor more info
located_in cytosol	TAS Traceable Author Statement more info
located_in extracellular exosome	HDA more info	PubMed
located_in intermediate filament	IEA Inferred from Electronic Annotation more info

General protein information

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Preferred Names: keratin, type I cytoskeletal 12

Names: CK-12; cytokeratin-12; keratin 12, type I

NCBI Reference Sequences (RefSeq)

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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.