NM_020822.3:c.16G>T

Variant names:

• chr9-135702274-G-T
• rs773874266
• NM_020822.3:c.16G>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_020822.3(KCNT1):​c.16G>T​(p.Gly6Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,456,624 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/19 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G6R) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: KCNT1 NM_020822.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.20
• Publications: 0 publications found

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]

SOHLH1 Gene-Disease associations (from GenCC):

• ovarian dysgenesis 5

  Inheritance: AR, AD Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
• hypogonadism

  Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.33899084).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KCNT1	NM_020822.3	c.16G>T	p.Gly6Trp	missense_variant	Exon 1 of 31	ENST00000371757.7	NP_065873.2
KCNT1	NM_001272003.2	c.16G>T	p.Gly6Trp	missense_variant	Exon 1 of 31		NP_001258932.1
SOHLH1	XM_011518698.4	c.-2170C>A		upstream_gene_variant			XP_011517000.1
SOHLH1	XM_006717109.5	c.-2299C>A		upstream_gene_variant			XP_006717172.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KCNT1	ENST00000371757.7	c.16G>T	p.Gly6Trp	missense_variant	Exon 1 of 31	1	NM_020822.3	ENSP00000360822.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1456624 Hom.: 0 Cov.: 31 AF XY: 0.00000276 AC XY: 2 AN XY: 724576

African (AFR) AF: 0.00 AC: 0 AN: 33144

American (AMR) AF: 0.00 AC: 0 AN: 44520

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25964

East Asian (EAS) AF: 0.00 AC: 0 AN: 39364

South Asian (SAS) AF: 0.00 AC: 0 AN: 86130

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 51864

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5706

European-Non Finnish (NFE) AF: 0.00000270 AC: 3 AN: 1109776

Other (OTH) AF: 0.00 AC: 0 AN: 60156

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	18
DANN	Uncertain	0.99
Eigen	Benign	-0.060
Eigen_PC	Benign	-0.19
FATHMM_MKL	Benign	0.37	N
LIST_S2	Benign	0.59	T;T;T
M_CAP	Pathogenic	0.37	D
MetaRNN	Benign	0.34	T;T;T
MetaSVM	Benign	-0.96	T
PhyloP100		-1.2
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.5	N;.;N
REVEL	Benign	0.18
Sift	Pathogenic	0.0	D;.;D
Sift4G	Pathogenic	0.0	D;D;D
Vest4		0.37
MutPred		0.56		Loss of disorder (P = 0.0331);Loss of disorder (P = 0.0331);Loss of disorder (P = 0.0331);
MVP		0.35
MPC		0.88
ClinPred		0.52	D
GERP RS		2.2
PromoterAI		0.0047	Neutral
gMVP		0.19
Mutation Taster		=94/6	polymorphism

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

Other links and lift over

dbSNP: rs773874266; hg19: chr9-138594120;