chr12-49027325-G-A

Variant names:

• chr12-49027325-G-A
• rs1555186093
• NM_003482.4:c.14644-3C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_003482.4(KMT2D):​c.14644-3C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000733 in 1,365,086 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: KMT2D NM_003482.4 splice_region, intron
• Scores: Splicing: ADA: 0.001180
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.444
• Publications: 0 publications found

Genes affected

KMT2D (HGNC:7133): (lysine methyltransferase 2D) The protein encoded by this gene is a histone methyltransferase that methylates the Lys-4 position of histone H3. The encoded protein is part of a large protein complex called ASCOM, which has been shown to be a transcriptional regulator of the beta-globin and estrogen receptor genes. Mutations in this gene have been shown to be a cause of Kabuki syndrome. [provided by RefSeq, Oct 2010]

KMT2D Gene-Disease associations (from GenCC):

• choanal atresia-athelia-hypothyroidism-delayed puberty-short stature syndrome

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: Illumina, G2P
• Kabuki syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, Laboratory for Molecular Medicine, ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics
• branchial arch abnormalities, choanal atresia, athelia, hearing loss, and hypothyroidism syndrome

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Kabuki syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
KMT2D	NM_003482.4	c.14644-3C>T		splice_region_variant, intron_variant	Intron 48 of 54	ENST00000301067.12	NP_003473.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
KMT2D	ENST00000301067.12	c.14644-3C>T		splice_region_variant, intron_variant	Intron 48 of 54	5	NM_003482.4	ENSP00000301067.7

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 7.33e-7 AC: 1 AN: 1365086 Hom.: 0 Cov.: 34 AF XY: 0.00000149 AC XY: 1 AN XY: 669300

African (AFR) AF: 0.00 AC: 0 AN: 30216

American (AMR) AF: 0.00 AC: 0 AN: 29008

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19950

East Asian (EAS) AF: 0.00 AC: 0 AN: 38734

South Asian (SAS) AF: 0.00 AC: 0 AN: 70216

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4446

European-Non Finnish (NFE) AF: 9.36e-7 AC: 1 AN: 1068002

Other (OTH) AF: 0.00 AC: 0 AN: 56104

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
CADD	Benign	10
DANN	Benign	0.77
PhyloP100		0.44

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0012
dbscSNV1_RF	Benign	0.036
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

Other links and lift over

dbSNP: rs1555186093; hg19: chr12-49421108;