2-232771003-AA-CG

Variant names:

• chr2-232771003-AA-CG
• NM_002242.4:c.359_360delTTinsCG
• KCNJ13 p.Ile120Thr

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PS1

The NM_002242.4(KCNJ13):​c.359_360delTTinsCG​(p.Ile120Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type MNV, and the frequency of such variant types in population databases may be underestimated and unreliable. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Pathogenic in ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I120V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: KCNJ13 NM_002242.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.52
• Publications: 0 publications found

Genes affected

KCNJ13 (HGNC:6259): (potassium inwardly rectifying channel subfamily J member 13) This gene encodes a member of the inwardly rectifying potassium channel family of proteins. Members of this family form ion channel pores that allow potassium ions to pass into a cell. The encoded protein belongs to a subfamily of low signal channel conductance proteins that have a low dependence on potassium concentration. Mutations in this gene are associated with snowflake vitreoretinal degeneration. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Feb 2010]

GIGYF2 (HGNC:11960): (GRB10 interacting GYF protein 2) This gene contains CAG trinucleotide repeats and encodes a protein containing several stretches of polyglutamine residues. The encoded protein may be involved in the regulation of tyrosine kinase receptor signaling. This gene is located in a chromosomal region that was genetically linked to Parkinson disease type 11, and mutations in this gene were thought to be causative for this disease. However, more recent studies in different populations have been unable to replicate this association. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2013]

GIGYF2 Gene-Disease associations (from GenCC):

• Parkinson disease 11, autosomal dominant, susceptibility to

  Inheritance: AD, Unknown Classification: MODERATE, LIMITED Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PS1: Transcript NM_002242.4 (KCNJ13) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in ClinVar.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002242.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNJ13	NM_002242.4	MANE Select	c.359_360delTTinsCG	p.Ile120Thr	missense	N/A	NP_002233.2	O60928-1
	GIGYF2	NM_001103146.3	MANE Select	c.532+9567_532+9568delAAinsCG		intron	N/A	NP_001096616.1	Q6Y7W6-1
	KCNJ13	NM_001172417.1		c.119_120delTTinsCG	p.Ile40Thr	missense	N/A	NP_001165888.1	O60928

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	KCNJ13	ENST00000233826.4	TSL:1 MANE Select	c.359_360delTTinsCG	p.Ile120Thr	missense	N/A	ENSP00000233826.3	O60928-1
	KCNJ13	ENST00000410029.1	TSL:1	c.359_360delTTinsCG	p.Ile120Thr	missense	N/A	ENSP00000386251.1	O60928-1
	GIGYF2	ENST00000373563.9	TSL:1 MANE Select	c.532+9567_532+9568delAAinsCG		intron	N/A	ENSP00000362664.5	Q6Y7W6-1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.5

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr2-233635713;