9-135702286-C-T

Variant names:

• chr9-135702286-C-T
• rs1174574288
• NM_020822.3:c.28C>T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020822.3(KCNT1):​c.28C>T​(p.Pro10Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,352 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. P10P) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: KCNT1 NM_020822.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.886

Genes affected

KCNT1 (HGNC:18865): (potassium sodium-activated channel subfamily T member 1) 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. This gene encodes a sodium-activated potassium channel subunit which is thought to function in ion conductance and developmental signaling pathways. Mutations in this gene cause the early-onset epileptic disorders, malignant migrating partial seizures of infancy and autosomal dominant nocturnal frontal lobe epilepsy. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Dec 2012]

SOHLH1 (HGNC:27845): (spermatogenesis and oogenesis specific basic helix-loop-helix 1) This gene encodes one of testis-specific transcription factors which are essential for spermatogenesis, oogenesis and folliculogenesis. This gene is located on chromosome 9. Mutations in this gene are associated with nonobstructive azoospermia. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2013]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12336427).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3	c.28C>T	p.Pro10Ser	missense_variant	Exon 1 of 31	ENST00000371757.7	NP_065873.2
KCNT1	NM_001272003.2	c.28C>T	p.Pro10Ser	missense_variant	Exon 1 of 31		NP_001258932.1
SOHLH1	XM_011518698.4	c.-2182G>A		upstream_gene_variant			XP_011517000.1
SOHLH1	XM_006717109.5	c.-2311G>A		upstream_gene_variant			XP_006717172.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNT1	ENST00000371757.7	c.28C>T	p.Pro10Ser	missense_variant	Exon 1 of 31	1	NM_020822.3	ENSP00000360822.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000424 AC: 1 AN: 236052 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 130354

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000963

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457352 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 724988

Gnomad4 AFR exome AF: 0.00

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: 9.01e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	17
DANN	Uncertain	0.98
Eigen	Benign	-1.0
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.13	N
LIST_S2	Benign	0.52	T;T;T
M_CAP	Pathogenic	0.30	D
MetaRNN	Benign	0.12	T;T;T
MetaSVM	Benign	-1.0	T
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-0.59	N;.;N
REVEL	Benign	0.041
Sift	Benign	0.053	T;.;D
Sift4G	Pathogenic	0.0	D;T;D
Vest4		0.17
MutPred		0.33		Gain of glycosylation at P10 (P = 0.018);Gain of glycosylation at P10 (P = 0.018);Gain of glycosylation at P10 (P = 0.018);
MVP		0.27
MPC		0.64
ClinPred		0.069	T
GERP RS		1.3
gMVP		0.15

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

LitVar

Other links and lift over

dbSNP: rs1174574288; hg19: chr9-138594132;