chr3-38365641-A-T

Position:

• chr3-38365641-A-T

Variant summary

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

The NM_005108.4(XYLB):​c.412A>T​(p.Met138Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: XYLB NM_005108.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.24

Genes affected

XYLB (HGNC:12839): (xylulokinase) The protein encoded by this gene shares 22% sequence identity with Hemophilus influenzae xylulokinase, and even higher identity to other gene products in C.elegans (45%) and yeast (31-35%), which are thought to belong to a family of enzymes that include fucokinase, gluconokinase, glycerokinase and xylulokinase. These proteins play important roles in energy metabolism. [provided by RefSeq, Aug 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
XYLB	NM_005108.4	c.412A>T	p.Met138Leu	missense_variant	6/19	ENST00000207870.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
XYLB	ENST00000207870.8	c.412A>T	p.Met138Leu	missense_variant	6/19	1	NM_005108.4	P1
XYLB	ENST00000650590.1	c.331A>T	p.Met111Leu	missense_variant	5/18
XYLB	ENST00000649234.1	c.412A>T	p.Met138Leu	missense_variant, NMD_transcript_variant	6/20
XYLB	ENST00000424034.5	c.*75A>T		3_prime_UTR_variant, NMD_transcript_variant	4/17	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

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

Oct 05, 2023

The c.412A>T (p.M138L) alteration is located in exon 6 (coding exon 6) of the XYLB gene. This alteration results from a A to T substitution at nucleotide position 412, causing the methionine (M) at amino acid position 138 to be replaced by a leucine (L). 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	Uncertain	0.35
BayesDel_addAF	Uncertain	0.077	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	24
DANN	Uncertain	0.98
DEOGEN2	Benign	0.046	T;.
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Uncertain	0.91	D;D
M_CAP	Benign	0.018	T
MetaRNN	Uncertain	0.72	D;D
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.7	M;.
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-2.7	D;.
REVEL	Uncertain	0.37
Sift	Uncertain	0.0050	D;.
Sift4G	Uncertain	0.0070	D;.
Polyphen		0.025	B;.
Vest4		0.71
MutPred		0.76		Loss of catalytic residue at M138 (P = 0.0076);.;
MVP		0.048
MPC		0.10
ClinPred		0.95	D
GERP RS		3.5
Varity_R		0.73
gMVP		0.50

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr3-38407132;