19-45350732-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_177417.3(KLC3):c.1364C>T(p.Ala455Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000135 in 1,612,064 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000092 (0 hom., cov: 30)
  • Exomes 𝑓: 0.00014 (0 hom.)
• Consequence: KLC3 NM_177417.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.982

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.039076805).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
KLC3	NM_177417.3	c.1364C>T	p.Ala455Val	missense_variant	11/13	ENST00000391946.7
ERCC2	NM_000400.4	c.*897G>A		3_prime_UTR_variant	23/23	ENST00000391945.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
KLC3	ENST00000391946.7	c.1364C>T	p.Ala455Val	missense_variant	11/13	1	NM_177417.3	P4
ERCC2	ENST00000391945.10	c.*897G>A		3_prime_UTR_variant	23/23	1	NM_000400.4	P1

Frequencies

GnomAD3 genomes AF: 0.0000921 AC: 14 AN: 152072 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.0000725

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000387

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.000479

GnomAD3 exomes AF: 0.0000906 AC: 22 AN: 242882 Hom.: 0 AF XY: 0.0000906 AC XY: 12 AN XY: 132462

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000265

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000282

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000727

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000140 AC: 204 AN: 1459992 Hom.: 0 Cov.: 34 AF XY: 0.000145 AC XY: 105 AN XY: 726220

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000338

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000202

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000158

Gnomad4 OTH exome AF: 0.0000663

GnomAD4 genome AF: 0.0000921 AC: 14 AN: 152072 Hom.: 0 Cov.: 30 AF XY: 0.0000539 AC XY: 4 AN XY: 74272

Gnomad4 AFR AF: 0.0000725

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000387

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000103

Gnomad4 OTH AF: 0.000479

Alfa AF: 0.000160 Hom.: 0

Bravo AF: 0.0000907

ExAC AF: 0.0000497 AC: 6

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 01, 2022

The c.1364C>T (p.A455V) alteration is located in exon 11 (coding exon 10) of the KLC3 gene. This alteration results from a C to T substitution at nucleotide position 1364, causing the alanine (A) at amino acid position 455 to be replaced by a valine (V). 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	0.078
BayesDel_addAF	Benign	-0.38	T
BayesDel_noAF	Benign	-0.48
Cadd	Benign	3.0
Dann	Benign	0.85
DEOGEN2	Benign	0.15	T;.;.
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.023	N
LIST_S2	Benign	0.52	T;T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.039	T;T;T
MetaSVM	Benign	-0.83	T
MutationAssessor	Benign	1.5	L;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.63	N;.;N
REVEL	Benign	0.14
Sift	Benign	0.87	T;.;T
Sift4G	Benign	0.28	T;T;T
Polyphen		0.0	B;B;B
Vest4		0.21
MVP		0.33
MPC		0.012
ClinPred		0.020	T
GERP RS		-7.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.014
gMVP		0.22

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs752348371; hg19: chr19-45853990;