Genetic Variant NM_002235.5:c.448C>T (chr12-4810489-C-T) – ACMG Classification: Uncertain_significance (1 pts)

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2BP4

The NM_002235.5(KCNA6):c.448C>T(p.Pro150Ser) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,830 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

KCNA6
NM_002235.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.96

Variant links:

Genes affected

KCNA6 (HGNC:6225): (potassium voltage-gated channel subfamily A member 6) Potassium channels represent the most complex class of voltage-gated ion channels from both functional and structural standpoints. Their diverse functions include regulating neurotransmitter release, heart rate, insulin secretion, neuronal excitability, epithelial electrolyte transport, smooth muscle contraction, and cell volume. Four sequence-related potassium channel genes - shaker, shaw, shab, and shal - have been identified in Drosophila, and each has been shown to have human homolog(s). This gene encodes a member of the potassium channel, voltage-gated, shaker-related subfamily. This member contains six membrane-spanning domains with a shaker-type repeat in the fourth segment. It belongs to the delayed rectifier class. The coding region of this gene is intronless, and the gene is clustered with genes KCNA1 and KCNA5 on chromosome 12. [provided by RefSeq, Jul 2008]

KCNA6 links:

GALNT8 (HGNC:4130): (polypeptide N-acetylgalactosaminyltransferase 8) This gene encodes a member of the UDP-N-acetyl-alpha-D-galactosamine:polypeptide N-acetylgalactosaminyltransferase (GalNAc-T) family of enzymes. GalNAc-Ts initiate mucin-type O-linked glycosylation in the Golgi apparatus by catalyzing the transfer of GalNAc to serine and threonine residues on target proteins. They are characterized by an N-terminal transmembrane domain, a stem region, a lumenal catalytic domain containing a GT1 motif and Gal/GalNAc transferase motif, and a C-terminal ricin/lectin-like domain. GalNAc-Ts have different, but overlapping, substrate specificities and patterns of expression. [provided by RefSeq, Jul 2008]

GALNT8 links:

ENSG00000256988 (HGNC:58276):

ENSG00000256988 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.3192575).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNA6	NM_002235.5 link	c.448C>T	p.Pro150Ser	missense_variant	Exon 1 of 1	ENST00000280684.4	NP_002226.1	P17658

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
KCNA6	ENST00000280684.4 link	c.448C>T	p.Pro150Ser	missense_variant	Exon 1 of 1	6	NM_002235.5	ENSP00000280684.3	P17658
GALNT8	ENST00000542998.5 link	c.310-40249C>T		intron_variant	Intron 3 of 3	3		ENSP00000440383.1	H0YFU9
ENSG00000256988	ENST00000662877.1 link	n.409+3067G>A		intron_variant	Intron 2 of 2
ENSG00000256988	ENST00000664363.1 link	n.1626+3067G>A		intron_variant	Intron 3 of 3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000205

AC:

AN:

1461830

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

727222

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

8.99e-7

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Nov 30, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.448C>T (p.P150S) alteration is located in exon 1 (coding exon 1) of the KCNA6 gene. This alteration results from a C to T substitution at nucleotide position 448, causing the proline (P) at amino acid position 150 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.17

BayesDel_addAF

Pathogenic

0.19

BayesDel_noAF

Uncertain

0.040

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.41

.;T

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.43

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.78

.;T

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.32

T;T

MetaSVM

Pathogenic

0.89

MutationAssessor

Benign

1.9

.;L

PrimateAI

Uncertain

0.59

PROVEAN

Pathogenic

-5.8

D;D

REVEL

Uncertain

0.54

Sift

Uncertain

0.0030

D;D

Sift4G

Benign

0.085

T;T

Polyphen

0.67

.;P

Vest4

0.25

MutPred

0.34

Gain of catalytic residue at Q154 (P = 0.0067);Gain of catalytic residue at Q154 (P = 0.0067);

MVP

0.82

MPC

1.9

ClinPred

0.99

GERP RS

4.9

Varity_R

0.57

gMVP

0.81

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over