19-45350363-A-G

Variant summary

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

The NM_177417.3(KLC3):c.1166A>G(p.Asn389Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000041 in 1,461,650 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: KLC3 NM_177417.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.68

Genes affected

KLC3 (HGNC:20717): (kinesin light chain 3) This gene encodes a member of the kinesin light chain gene family. Kinesins are molecular motors involved in the transport of cargo along microtubules, and are composed of two kinesin heavy chain (KHC) and two kinesin light chain (KLC) molecules. KLCs are thought to typically be involved in binding cargo and regulating kinesin activity. In the rat, a protein similar to this gene product is expressed in post-meiotic spermatids, where it associates with structural components of sperm tails and mitochondria. [provided by RefSeq, Jul 2008]

ERCC2 (HGNC:3434): (ERCC excision repair 2, TFIIH core complex helicase subunit) The nucleotide excision repair pathway is a mechanism to repair damage to DNA. The protein encoded by this gene is involved in transcription-coupled nucleotide excision repair and is an integral member of the basal transcription factor BTF2/TFIIH complex. The gene product has ATP-dependent DNA helicase activity and belongs to the RAD3/XPD subfamily of helicases. Defects in this gene can result in three different disorders, the cancer-prone syndrome xeroderma pigmentosum complementation group D, trichothiodystrophy, and Cockayne syndrome. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2008]

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=0.17977753).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KLC3	NM_177417.3	c.1166A>G	p.Asn389Ser	missense_variant	9/13	ENST00000391946.7
ERCC2	NM_000400.4	c.*1266T>C		3_prime_UTR_variant	23/23	ENST00000391945.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KLC3	ENST00000391946.7	c.1166A>G	p.Asn389Ser	missense_variant	9/13	1	NM_177417.3	P4
ERCC2	ENST00000391945.10	c.*1266T>C		3_prime_UTR_variant	23/23	1	NM_000400.4	P1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD3 exomes AF: 0.00000803 AC: 2 AN: 248972 Hom.: 0 AF XY: 0.0000148 AC XY: 2 AN XY: 135174

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: 0.0000654

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000410 AC: 6 AN: 1461650 Hom.: 0 Cov.: 34 AF XY: 0.00000825 AC XY: 6 AN XY: 727090

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: 0.0000696

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 11, 2022

The c.1166A>G (p.N389S) alteration is located in exon 9 (coding exon 8) of the KLC3 gene. This alteration results from a A to G substitution at nucleotide position 1166, causing the asparagine (N) at amino acid position 389 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	0.12
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.37
Cadd	Benign	20
Dann	Uncertain	0.99
Eigen	Benign	-0.40
Eigen_PC	Benign	-0.28
FATHMM_MKL	Benign	0.55	D
LIST_S2	Uncertain	0.88	D;D;D;D
M_CAP	Benign	0.078	D
MetaRNN	Benign	0.18	T;T;T;T
MetaSVM	Benign	-0.87	T
MutationTaster	Benign	1.0	D;N;N;N
PrimateAI	Uncertain	0.63	T
Sift4G	Uncertain	0.037	D;D;D;D
Polyphen		0.042, 0.034, 0.065	.;B;B;B
Vest4		0.21, 0.22, 0.23
MutPred		0.56		Loss of methylation at K390 (P = 0.0848);Loss of methylation at K390 (P = 0.0848);.;.;
MVP		0.76
MPC		0.013
ClinPred		0.35	T
GERP RS		1.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.038
gMVP		0.16

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs781486330; hg19: chr19-45853621;