3-123612927-TTAAG-TTAAGTAAG

Variant names:

• chr3-123612927-T-TTAAG
• rs146691098
• NM_053025.4:c.*1174_*1177dupCTTA

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP6 BA1

The NM_053025.4(MYLK):​c.*1174_*1177dupCTTA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.024 in 142,144 control chromosomes in the GnomAD database, including 194 homozygotes. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.024 (194 hom., cov: 32)
  • Exomes 𝑓: 0.019 (0 hom.)
• Consequence: MYLK NM_053025.4 3_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 1.17
• Publications: 1 publications found

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]

MYLK-AS1 (HGNC:42440): (MYLK antisense RNA 1)

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP6: Variant 3-123612927-T-TTAAG is Benign according to our data. Variant chr3-123612927-T-TTAAG is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 342835.
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.258 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_053025.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYLK	NM_053025.4	MANE Select	c.*1174_*1177dupCTTA		3_prime_UTR	Exon 34 of 34	NP_444253.3
	MYLK	NM_053027.4		c.*1174_*1177dupCTTA		3_prime_UTR	Exon 33 of 33	NP_444255.3
	MYLK	NM_053026.4		c.*1174_*1177dupCTTA		3_prime_UTR	Exon 33 of 33	NP_444254.3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	MYLK	ENST00000360304.8	TSL:5 MANE Select	c.*1174_*1177dupCTTA		3_prime_UTR	Exon 34 of 34	ENSP00000353452.3	Q15746-1
	MYLK	ENST00000418370.6	TSL:1	c.*1174_*1177dupCTTA		3_prime_UTR	Exon 3 of 3	ENSP00000428967.1	Q15746-8
	MYLK-AS1	ENST00000470449.3	TSL:1	n.274-16565_274-16562dupAAGT		intron	N/A

Frequencies

GnomAD3 genomes AF: 0.0239 AC: 3389 AN: 141622 Hom.: 190 Cov.: 32

Gnomad AFR AF: 0.0122

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0334

Gnomad ASJ AF: 0.00867

Gnomad EAS AF: 0.269

Gnomad SAS AF: 0.0920

Gnomad FIN AF: 0.00848

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0103

Gnomad OTH AF: 0.0249

GnomAD4 exome AF: 0.0185 AC: 8 AN: 432 Hom.: 0 Cov.: 0 AF XY: 0.0231 AC XY: 6 AN XY: 260

African (AFR) AC: 0 AN: 0

American (AMR) AC: 0 AN: 0

Ashkenazi Jewish (ASJ) AC: 0 AN: 0

East Asian (EAS) AC: 0 AN: 0

South Asian (SAS) AC: 0 AN: 0

European-Finnish (FIN) AF: 0.0188 AC: 8 AN: 426

Middle Eastern (MID) AC: 0 AN: 0

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 2

Other (OTH) AF: 0.00 AC: 0 AN: 4

GnomAD4 genome AF: 0.0240 AC: 3398 AN: 141712 Hom.: 194 Cov.: 32 AF XY: 0.0271 AC XY: 1878 AN XY: 69230

African (AFR) AF: 0.0122 AC: 402 AN: 33026

American (AMR) AF: 0.0334 AC: 474 AN: 14184

Ashkenazi Jewish (ASJ) AF: 0.00867 AC: 30 AN: 3460

East Asian (EAS) AF: 0.271 AC: 1210 AN: 4470

South Asian (SAS) AF: 0.0917 AC: 433 AN: 4722

European-Finnish (FIN) AF: 0.00848 AC: 90 AN: 10608

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 292

European-Non Finnish (NFE) AF: 0.0103 AC: 703 AN: 68006

Other (OTH) AF: 0.0276 AC: 56 AN: 2032

Alfa AF: 0.0151 Hom.: 7

Bravo AF: 0.0236

Asia WGS AF: 0.157 AC: 528 AN: 3366

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	1	Familial thoracic aortic aneurysm and aortic dissection (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.2
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs146691098; hg19: chr3-123331774;