rs4677905

Positions:

• chr3-123805987-T-A

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_053025.4(MYLK):​c.-3-12143A>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.182 in 152,242 control chromosomes in the GnomAD database, including 2,981 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.18 (2981 hom., cov: 33)
• Consequence: MYLK NM_053025.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0330

Genes affected

MYLK (HGNC:7590): (myosin light chain kinase) This gene, a muscle member of the immunoglobulin gene superfamily, encodes myosin light chain kinase which is a calcium/calmodulin dependent enzyme. This kinase phosphorylates myosin regulatory light chains to facilitate myosin interaction with actin filaments to produce contractile activity. This gene encodes both smooth muscle and nonmuscle isoforms. In addition, using a separate promoter in an intron in the 3' region, it encodes telokin, a small protein identical in sequence to the C-terminus of myosin light chain kinase, that is independently expressed in smooth muscle and functions to stabilize unphosphorylated myosin filaments. A pseudogene is located on the p arm of chromosome 3. Four transcript variants that produce four isoforms of the calcium/calmodulin dependent enzyme have been identified as well as two transcripts that produce two isoforms of telokin. Additional variants have been identified but lack full length transcripts. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.242 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
MYLK	NM_053025.4	c.-3-12143A>T		intron_variant		ENST00000360304.8	NP_444253.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
MYLK	ENST00000360304.8	c.-3-12143A>T		intron_variant		5	NM_053025.4	ENSP00000353452	P4

Frequencies

GnomAD3 genomes AF: 0.182 AC: 27681 AN: 152124 Hom.: 2980 Cov.: 33

Gnomad AFR AF: 0.0892

Gnomad AMI AF: 0.346

Gnomad AMR AF: 0.137

Gnomad ASJ AF: 0.202

Gnomad EAS AF: 0.0287

Gnomad SAS AF: 0.168

Gnomad FIN AF: 0.264

Gnomad MID AF: 0.117

Gnomad NFE AF: 0.245

Gnomad OTH AF: 0.190

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.182 AC: 27695 AN: 152242 Hom.: 2981 Cov.: 33 AF XY: 0.181 AC XY: 13490 AN XY: 74438

Gnomad4 AFR AF: 0.0892

Gnomad4 AMR AF: 0.137

Gnomad4 ASJ AF: 0.202

Gnomad4 EAS AF: 0.0287

Gnomad4 SAS AF: 0.166

Gnomad4 FIN AF: 0.264

Gnomad4 NFE AF: 0.245

Gnomad4 OTH AF: 0.191

Alfa AF: 0.211 Hom.: 475

Bravo AF: 0.169

Asia WGS AF: 0.100 AC: 347 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	4.7
DANN	Benign	0.88

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: rs4677905; hg19: chr3-123524834;